Articles | Volume 43, issue 1
https://doi.org/10.5194/angeo-43-303-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-43-303-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Regular paper
| Highlight paper
| 
11 Jun 2025
Regular paper | Highlight paper |
| 11 Jun 2025
| 11 Jun 2025
Leaping and vortex motion of the shock aurora toward the late evening sector observed on 26 February 2023
Swedish Institute of Space Physics (IRF), Kiruna, Sweden
Masatoshi Yamauchi
Swedish Institute of Space Physics (IRF), Kiruna, Sweden
Magnar Gullikstad Johnsen
Tromsø Geophysical Observatory, UiT The Arctic University of Norway, Tromsø, Norway
Yoshihiro Yokoyama
Swedish Institute of Space Physics (IRF), Kiruna, Sweden
Urban Brändström
Swedish Institute of Space Physics (IRF), Kiruna, Sweden
Yasunobu Ogawa
National Institute of Polar Research, Tokyo, Japan
Anna Naemi Willer
National Space Institute, Technical University of Denmark (DTU Space), Kongens Lyngby, Denmark
Keisuke Hosokawa
Graduate School of Informatics and Engineering, The University of Electro-Communications, Tokyo, Japan
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Gaël Cessateur, Christian Buil, Guillaume Bertrand, Matthieu Le Lain, Valérie Desnoux, Olivier Garde, Hervé Lamy, Mathieu Barthelemy, Magnar Gullikstad Johnsen, David Bolsée, Urban Brändström, Antoine Calegaro, Fabien Darrouzet, Rowan Dayton-Oxland, Johan De Keyser, Maxime Grandin, Kirsti Kauristie, Romain Maggiolo, Sota Nanjo, and Noora Partamies
EGUsphere, https://doi.org/10.5194/egusphere-2026-5461, https://doi.org/10.5194/egusphere-2026-5461, 2026
This preprint is open for discussion and under review for Geoscientific Instrumentation, Methods and Data Systems (GI).
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We developed a compact, portable instrument that records the colours of auroras across a broad range of visible and near-infrared light. Field tests in northern Norway showed that it can capture several important auroral emissions at the same time and can be operated with simple portable equipment. This makes it suitable for coordinated observations from multiple sites, helping researchers study how auroras vary in space and time.
Sota Nanjo, Tomoe Taki, Tima Sergienko, and Urban Brändström
EGUsphere, https://doi.org/10.5194/egusphere-2026-5693, https://doi.org/10.5194/egusphere-2026-5693, 2026
This preprint is open for discussion and under review for Annales Geophysicae (ANGEO).
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Auroral colors are used to estimate the energy of particles entering Earth's atmosphere, but the processes producing those colors are not always well known. Using five cameras in northern Sweden and two computer models, we measured where two auroral emissions were produced. We found that a process involving oxygen molecules shifts one emission to lower altitudes and improves agreement between models and observations by about 70%. This can make estimates of auroral particle energy more reliable.
Sota Nanjo, Tomoe Taki, Keisuke Hosokawa, Urban Brändström, Yoshizumi Miyoshi, and Magnar G. Johnsen
Ann. Geophys., 44, 1023–1042, https://doi.org/10.5194/angeo-44-1023-2026, https://doi.org/10.5194/angeo-44-1023-2026, 2026
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Pulsating aurora often contains rapid brightness changes, but their overall behavior has not been well measured. We analyzed high-speed camera images from northern Sweden and Norway with machine learning to identify when these rapid changes occur. We found that they become more common toward the morning and at the lower-latitude sector. This suggests that small-scale auroral fluctuation can help reveal how particles from near-Earth space enter the upper atmosphere.
Vanina Lanabere, Stephan Buchert, Adrian Blagau, Harriet George, Sota Nanjo, Liisa Juusola, Andrew P. Dimmock, Samuel Wharton, Heikki Vanhamäki, Octav Marghitu, Louis Richard, Lei Cai, Alice V. L. Wallner, Daria Kotova, Yaqi Jin, Theresa Hoppe, Jennifer A. Carter, and Anita Aikio
Ann. Geophys., 44, 977–1001, https://doi.org/10.5194/angeo-44-977-2026, https://doi.org/10.5194/angeo-44-977-2026, 2026
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We studied a series of fast plasma streams that connected Earth’s nightside magnetic environment with the high‑latitude ionized upper atmosphere on 7 December 2023. Using satellite, auroral images and ground observations, we showed how each stream disturbed the upper atmosphere. Their repeated impact strengthened these disturbances until a substorm began, revealing how small events can build up to a larger magnetic disruption.
Sota Nanjo, Satoshi Kurita, Tima Sergienko, Yoshizumi Miyoshi, and Ryuho Kataoka
Ann. Geophys., 44, 959–975, https://doi.org/10.5194/angeo-44-959-2026, https://doi.org/10.5194/angeo-44-959-2026, 2026
Short summary
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Using a high-speed camera with a wide view of the sky, we observed rapidly blinking aurora across several hundred kilometers. We found that different parts of the same auroral arc can blink at different rhythms at the same time, and that these rhythms move together with the arc. Although larger bright patches sometimes blink more slowly, this pattern does not hold overall. These results improve our understanding of how invisible space processes shape the visible northern lights.
Tomoe Taki, Tima Sergienko, Urban Brändström, Yasunobu Ogawa, Sota Nanjo, and Juan Araújo
EGUsphere, https://doi.org/10.5194/egusphere-2026-1133, https://doi.org/10.5194/egusphere-2026-1133, 2026
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This study explored electric forces near a auroral arc during a rocket experiment in northern Sweden. A rocket released glowing clouds high above Earth, and we tracked their motion as an aurora passed through them. By reconstructing their motion in three dimensions, we estimated the magnitude and direction of the surrounding electric field. We found that the field changed direction and became weaker near the arc, revealing the structure of electric currents correspond to auroral activity.
Sota Nanjo, Katie Herlingshaw, Tima Sergienko, Gaël Cessateur, Noora Partamies, Magnar G. Johnsen, Keisuke Hosokawa, Hervé Lamy, Yasunobu Ogawa, Antti Kero, Shin-ichiro Oyama, and Masatoshi Yamauchi
Ann. Geophys., 44, 63–84, https://doi.org/10.5194/angeo-44-63-2026, https://doi.org/10.5194/angeo-44-63-2026, 2026
Short summary
Short summary
During the New Year’s Day storm of 2025, we observed rare auroral features: thin, short-lived green stripes and a “picket fence” near the poleward edge of the auroral oval. Using ground cameras and satellites, we found that the stripes sometimes appeared at widely separated longitudes at the same time and often tracked the motion of nearby red auroras. Some stripes were aligned with the magnetic field, while others were not, implying that multiple local processes contribute to their generation.
Gaël Cessateur, Keisuke Hosokawa, Hervé Lamy, Sota Nanjo, Mathieu Barthelemy, Magnar G. Johnsen, and Romain Maggiolo
EGUsphere, https://doi.org/10.5194/egusphere-2026-385, https://doi.org/10.5194/egusphere-2026-385, 2026
Short summary
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The Auroral Spectrograph in Skibotn has been measuring auroral light spectra since October 2023. We estimate the energy of electrons producing diffuse auroras from red oxygen and blue nitrogen emissions. Our statistical analysis shows that electron energy increases toward the morning sector, confirming previous studies: electron scattering by chorus waves can populate the loss cone and lead to precipitation, while changes in resonance conditions toward dawn favor harder electrons
Sota Nanjo, Tomoe Taki, Tima Sergienko, and Urban Brändström
EGUsphere, https://doi.org/10.5194/egusphere-2026-5693, https://doi.org/10.5194/egusphere-2026-5693, 2026
This preprint is open for discussion and under review for Annales Geophysicae (ANGEO).
Short summary
Short summary
Auroral colors are used to estimate the energy of particles entering Earth's atmosphere, but the processes producing those colors are not always well known. Using five cameras in northern Sweden and two computer models, we measured where two auroral emissions were produced. We found that a process involving oxygen molecules shifts one emission to lower altitudes and improves agreement between models and observations by about 70%. This can make estimates of auroral particle energy more reliable.
Gaël Cessateur, Christian Buil, Guillaume Bertrand, Matthieu Le Lain, Valérie Desnoux, Olivier Garde, Hervé Lamy, Mathieu Barthelemy, Magnar Gullikstad Johnsen, David Bolsée, Urban Brändström, Antoine Calegaro, Fabien Darrouzet, Rowan Dayton-Oxland, Johan De Keyser, Maxime Grandin, Kirsti Kauristie, Romain Maggiolo, Sota Nanjo, and Noora Partamies
EGUsphere, https://doi.org/10.5194/egusphere-2026-5461, https://doi.org/10.5194/egusphere-2026-5461, 2026
This preprint is open for discussion and under review for Geoscientific Instrumentation, Methods and Data Systems (GI).
Short summary
Short summary
We developed a compact, portable instrument that records the colours of auroras across a broad range of visible and near-infrared light. Field tests in northern Norway showed that it can capture several important auroral emissions at the same time and can be operated with simple portable equipment. This makes it suitable for coordinated observations from multiple sites, helping researchers study how auroras vary in space and time.
Sota Nanjo, Tomoe Taki, Keisuke Hosokawa, Urban Brändström, Yoshizumi Miyoshi, and Magnar G. Johnsen
Ann. Geophys., 44, 1023–1042, https://doi.org/10.5194/angeo-44-1023-2026, https://doi.org/10.5194/angeo-44-1023-2026, 2026
Short summary
Short summary
Pulsating aurora often contains rapid brightness changes, but their overall behavior has not been well measured. We analyzed high-speed camera images from northern Sweden and Norway with machine learning to identify when these rapid changes occur. We found that they become more common toward the morning and at the lower-latitude sector. This suggests that small-scale auroral fluctuation can help reveal how particles from near-Earth space enter the upper atmosphere.
Vanina Lanabere, Stephan Buchert, Adrian Blagau, Harriet George, Sota Nanjo, Liisa Juusola, Andrew P. Dimmock, Samuel Wharton, Heikki Vanhamäki, Octav Marghitu, Louis Richard, Lei Cai, Alice V. L. Wallner, Daria Kotova, Yaqi Jin, Theresa Hoppe, Jennifer A. Carter, and Anita Aikio
Ann. Geophys., 44, 977–1001, https://doi.org/10.5194/angeo-44-977-2026, https://doi.org/10.5194/angeo-44-977-2026, 2026
Short summary
Short summary
We studied a series of fast plasma streams that connected Earth’s nightside magnetic environment with the high‑latitude ionized upper atmosphere on 7 December 2023. Using satellite, auroral images and ground observations, we showed how each stream disturbed the upper atmosphere. Their repeated impact strengthened these disturbances until a substorm began, revealing how small events can build up to a larger magnetic disruption.
Sota Nanjo, Satoshi Kurita, Tima Sergienko, Yoshizumi Miyoshi, and Ryuho Kataoka
Ann. Geophys., 44, 959–975, https://doi.org/10.5194/angeo-44-959-2026, https://doi.org/10.5194/angeo-44-959-2026, 2026
Short summary
Short summary
Using a high-speed camera with a wide view of the sky, we observed rapidly blinking aurora across several hundred kilometers. We found that different parts of the same auroral arc can blink at different rhythms at the same time, and that these rhythms move together with the arc. Although larger bright patches sometimes blink more slowly, this pattern does not hold overall. These results improve our understanding of how invisible space processes shape the visible northern lights.
Marie Vigger Eldor, Magnar Gullikstad Johnsen, Nils Olsen, and Anna Naemi Willer
Ann. Geophys., 44, 811–823, https://doi.org/10.5194/angeo-44-811-2026, https://doi.org/10.5194/angeo-44-811-2026, 2026
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Rapid geomagnetic variations in the ultra-low frequency band are observed using ground-based magnetometers. We apply four years of data from West Greenland in a statistical analysis of the distribution of such variations. We identify a rapid geomagnetic variation population associated with the magnetospheric cusp that is separate from the auroral oval during summer. Earlier studies, which were mainly performed in winter, failed to unambiguously identify these variations.
Gaël Cessateur, Jean Lilensten, Hervé Lamy, Léo Bosse, Magnar G. Johnsen, Antonio Guerrero, David Bolsée, Mathieu Barthelemy, Thijs A. Stockmans, and Frans Snik
EGUsphere, https://doi.org/10.5194/egusphere-2026-3324, https://doi.org/10.5194/egusphere-2026-3324, 2026
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Auroras are more than beautiful lights: the way their light is polarized may reveal how charged particles enter the upper atmosphere. Such measurements have so far been limited to instruments that observe only a very small part of the sky. In this study, we show that a new polarization camera can map this signal across an aurora. We find that the polarization angle often changes coherently across the scene, while the polarization strength decreases in the brightest parts.
Thomas B. Leyser, Tima Sergienko, Yoshihiro Yokoyama, Tomoe Taki, and Urban Brändström
EGUsphere, https://doi.org/10.5194/egusphere-2026-2925, https://doi.org/10.5194/egusphere-2026-2925, 2026
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The BROR rocket experiment, launched from Esrange near Kiruna, Sweden, involved releases of barium clouds in the thermosphere to study auroral structures. The barium was ejected by the explosion-like combustion of ignited thermite. Shock waves could be observed to follow the ejections when the rocket speed was supersonic, but not when subsonic. The shock waves are attributed to ejected particulate matter from the thermite combustion that traveled at supersonic speed.
Masatoshi Yamauchi, Yoshihiro Yokoyama, Tsubasa Kotani, and Jürgen Matzka
EGUsphere, https://doi.org/10.5194/egusphere-2026-1517, https://doi.org/10.5194/egusphere-2026-1517, 2026
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The interplanetary shock such as the coronal mass ejections (CME) generally propagates faster than the solar wind, and predicting the propagation speed and the arrival time of hazardous CMEs are important for the space weather prediction. However, it is still difficult to model correctly. This paper statistically study the relation between the solar wind speed and the shock propagation speed.
Liisa Juusola, Ari Viljanen, Ilja Honkonen, Magnar Gullikstad Johnsen, Andrew Dimmock, Vanina Lanabere, and Alice Wallner
EGUsphere, https://doi.org/10.5194/egusphere-2026-1110, https://doi.org/10.5194/egusphere-2026-1110, 2026
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During severe space storms, the induced geoelectric field has the potential to cause substantial problems in power grids. We examine the geomagnetically induced currents (GIC) the geoelectric field would have driven in a simple model power grid located in Northern Europe during the May 2024 superstorm. Our results help us understand how the complicated interaction between the driving from space and the response of the conducting ground produces the most intense GIC peaks.
Tomoe Taki, Tima Sergienko, Urban Brändström, Yasunobu Ogawa, Sota Nanjo, and Juan Araújo
EGUsphere, https://doi.org/10.5194/egusphere-2026-1133, https://doi.org/10.5194/egusphere-2026-1133, 2026
Short summary
Short summary
This study explored electric forces near a auroral arc during a rocket experiment in northern Sweden. A rocket released glowing clouds high above Earth, and we tracked their motion as an aurora passed through them. By reconstructing their motion in three dimensions, we estimated the magnitude and direction of the surrounding electric field. We found that the field changed direction and became weaker near the arc, revealing the structure of electric currents correspond to auroral activity.
Kian Sartipzadeh, Andreas Kvammen, Björn Gustavsson, Njål Gulbrandsen, Magnar G. Johnsen, Devin Huyghebaert, and Juha Vierinen
Ann. Geophys., 44, 85–107, https://doi.org/10.5194/angeo-44-85-2026, https://doi.org/10.5194/angeo-44-85-2026, 2026
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Knowledge of the charged environment in the upper atmosphere is essential for understanding space weather effects on satellites and radio communication. This environment is difficult to estimate at high latitudes, where aurora cause strong variability. We developed an artificial intelligence model to estimate this environment continuously. Our results show that the model provides reliable estimates even during auroral activity, improving monitoring of the polar upper atmosphere.
Sota Nanjo, Katie Herlingshaw, Tima Sergienko, Gaël Cessateur, Noora Partamies, Magnar G. Johnsen, Keisuke Hosokawa, Hervé Lamy, Yasunobu Ogawa, Antti Kero, Shin-ichiro Oyama, and Masatoshi Yamauchi
Ann. Geophys., 44, 63–84, https://doi.org/10.5194/angeo-44-63-2026, https://doi.org/10.5194/angeo-44-63-2026, 2026
Short summary
Short summary
During the New Year’s Day storm of 2025, we observed rare auroral features: thin, short-lived green stripes and a “picket fence” near the poleward edge of the auroral oval. Using ground cameras and satellites, we found that the stripes sometimes appeared at widely separated longitudes at the same time and often tracked the motion of nearby red auroras. Some stripes were aligned with the magnetic field, while others were not, implying that multiple local processes contribute to their generation.
Gaël Cessateur, Keisuke Hosokawa, Hervé Lamy, Sota Nanjo, Mathieu Barthelemy, Magnar G. Johnsen, and Romain Maggiolo
EGUsphere, https://doi.org/10.5194/egusphere-2026-385, https://doi.org/10.5194/egusphere-2026-385, 2026
Short summary
Short summary
The Auroral Spectrograph in Skibotn has been measuring auroral light spectra since October 2023. We estimate the energy of electrons producing diffuse auroras from red oxygen and blue nitrogen emissions. Our statistical analysis shows that electron energy increases toward the morning sector, confirming previous studies: electron scattering by chorus waves can populate the loss cone and lead to precipitation, while changes in resonance conditions toward dawn favor harder electrons
Stephen Omondi, Spencer Mark Hatch, Andreas Kvammen, Magnar Gullikstad Johnsen, Mathew J. Owens, Kristian Solheim Thinn, and Rodrigo López
EGUsphere, https://doi.org/10.5194/egusphere-2025-6298, https://doi.org/10.5194/egusphere-2025-6298, 2026
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Researchers tested whether combining real-time solar wind data with forecasts can improve predictions of local geomagnetic activity in Norway. Using a machine learning model, they found that accurate solar wind speed and magnetic field direction are key for reliable forecasts over 3 hours ahead, while CME arrival time only helps if magnetic field data is precise.
Anna Willer, Lars William Pedersen, Jan Oechsle, and Marie Vigger Eldor
Geosci. Instrum. Method. Data Syst., 15, 1–6, https://doi.org/10.5194/gi-15-1-2026, https://doi.org/10.5194/gi-15-1-2026, 2026
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The new Arctic magnetic observatory at Pituffik in Greenland is strategically located in a sparsely monitored high-latitude region. Analysis of over a year of data, including baseline stability, temperature control, and calibrated magnetic field measurements demonstrates high data quality and confirms the observatory’s readiness for contribution to the international geomagnetic community.
Tomotaka M. Tanaka, Yasunobu Ogawa, Yuto Katoh, Mizuki Fukizawa, Anton Artemyev, Vassilis Angelopoulos, Xiao-Jia Zhang, Yoshimasa Tanaka, and Akira Kadokura
Ann. Geophys., 43, 621–631, https://doi.org/10.5194/angeo-43-621-2025, https://doi.org/10.5194/angeo-43-621-2025, 2025
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The magnetic mirror force bends the orbits of electrons precipitating into the atmosphere. It has been suggested that relativistic electrons make much less ionization due to the force than if it did not exist, but the actual effectivity in the atmospheric electron density has not been revealed. We used conjugated observational data from the ELFIN (Electron Losses and Fields INvestigation) satellite and the EISCAT (European Incoherent SCATter scientific radar system) Tromsø radar to find that the electron density decreased by about 40 % at 80 km altitude because of the force.
Ingeborg Frøystein and Magnar Gullikstad Johnsen
Ann. Geophys., 43, 241–269, https://doi.org/10.5194/angeo-43-241-2025, https://doi.org/10.5194/angeo-43-241-2025, 2025
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The complete time series of the geomagnetic disturbance index (K) from Norwegian magnetic observatories have been digitized. We compare and discuss the tree methods used to derive the index, finding that each method has strengths and weaknesses. In total, we present all K indices derived from Norwegian observatories since the 1930s until today, the used derivation methods and the long historic time series as a whole, enabling critical use for future scientific work.
Tinna L. Gunnarsdottir, Ingrid Mann, Wuhu Feng, Devin R. Huyghebaert, Ingemar Haeggstroem, Yasunobu Ogawa, Norihito Saito, Satonori Nozawa, and Takuya D. Kawahara
Ann. Geophys., 42, 213–228, https://doi.org/10.5194/angeo-42-213-2024, https://doi.org/10.5194/angeo-42-213-2024, 2024
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Several tons of meteoric particles burn up in our atmosphere each day. This deposits a great deal of material that binds with other atmospheric particles and forms so-called meteoric smoke particles. These particles are assumed to influence radar measurements. Here, we have compared radar measurements with simulations of a radar spectrum with and without dust particles and found that dust influences the radar spectrum in the altitude range of 75–85 km.
Yoshimasa Tanaka, Yasunobu Ogawa, Akira Kadokura, Takehiko Aso, Björn Gustavsson, Urban Brändström, Tima Sergienko, Genta Ueno, and Satoko Saita
Ann. Geophys., 42, 179–190, https://doi.org/10.5194/angeo-42-179-2024, https://doi.org/10.5194/angeo-42-179-2024, 2024
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We present via simulation how useful monochromatic images taken by a multi-point imager network are for auroral research in the EISCAT_3D project. We apply the generalized-aurora computed tomography (G-ACT) to modeled multiple auroral images and ionospheric electron density data. It is demonstrated that G-ACT provides better reconstruction results than the normal ACT and can interpolate ionospheric electron density at a much higher spatial resolution than observed by the EISCAT_3D radar.
Peter Dalin, Urban Brändström, Johan Kero, Peter Voelger, Takanori Nishiyama, Trond Trondsen, Devin Wyatt, Craig Unick, Vladimir Perminov, Nikolay Pertsev, and Jonas Hedin
Atmos. Meas. Tech., 17, 1561–1576, https://doi.org/10.5194/amt-17-1561-2024, https://doi.org/10.5194/amt-17-1561-2024, 2024
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A novel infrared imaging instrument (OH imager) was put into operation in November 2022 at the Swedish Institute of Space Physics in Kiruna (Sweden). The OH imager is dedicated to the study of nightglow emissions coming from the hydroxyl (OH) and molecular oxygen (O2) layers in the mesopause (80–100 km). Based on a brightness ratio of two OH emission lines, the neutral temperature is estimated at around 87 km. The average daily winter temperature for the period January–April 2023 is 203±10 K.
Thomas B. Leyser, Tima Sergienko, Urban Brändström, Björn Gustavsson, and Michael T. Rietveld
Ann. Geophys., 41, 589–600, https://doi.org/10.5194/angeo-41-589-2023, https://doi.org/10.5194/angeo-41-589-2023, 2023
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Powerful radio waves transmitted into the ionosphere from the ground were used to study electron energization in the pumped ionospheric plasma turbulence, by detecting optical emissions from atomic oxygen. Our results obtained with the EISCAT (European Incoherent Scatter Scientific Association) facilities in northern Norway and optical detection with the ALIS (Auroral Large Imaging System) in northern Sweden suggest that long-wavelength upper hybrid waves are important in accelerating electrons.
Mizuki Fukizawa, Yoshimasa Tanaka, Yasunobu Ogawa, Keisuke Hosokawa, Tero Raita, and Kirsti Kauristie
Ann. Geophys., 41, 511–528, https://doi.org/10.5194/angeo-41-511-2023, https://doi.org/10.5194/angeo-41-511-2023, 2023
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We use computed tomography to reconstruct the three-dimensional distributions of the Hall and Pedersen conductivities of pulsating auroras, a key research target for understanding the magnetosphere–ionosphere coupling process. It is suggested that the high-energy electron precipitation associated with pulsating auroras may have a greater impact on the closure of field-aligned currents in the ionosphere than has been previously reported.
Masatoshi Yamauchi and Urban Brändström
Geosci. Instrum. Method. Data Syst., 12, 71–90, https://doi.org/10.5194/gi-12-71-2023, https://doi.org/10.5194/gi-12-71-2023, 2023
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Potential users of all-sky aurora images even include power companies, tourists, and aurora enthusiasts. However, these potential users are normally not familiar with interpreting these images. To make them comprehensive for more users, we developed an automatic evaluation system of auroral activity level. The method involves two steps: first making a simple set of numbers that describes the auroral activity and then further simplifying them into several levels (Level 6 is an auroral explosion).
Mizuki Fukizawa, Takeshi Sakanoi, Yoshimasa Tanaka, Yasunobu Ogawa, Keisuke Hosokawa, Björn Gustavsson, Kirsti Kauristie, Alexander Kozlovsky, Tero Raita, Urban Brändström, and Tima Sergienko
Ann. Geophys., 40, 475–484, https://doi.org/10.5194/angeo-40-475-2022, https://doi.org/10.5194/angeo-40-475-2022, 2022
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The pulsating auroral generation mechanism has been investigated by observing precipitating electrons using rockets or satellites. However, it is difficult for such observations to distinguish temporal changes from spatial ones. In this study, we reconstructed the horizontal 2-D distribution of precipitating electrons using only auroral images. The 3-D aurora structure was also reconstructed. We found that there were both spatial and temporal changes in the precipitating electron energy.
Fasil Tesema, Noora Partamies, Daniel K. Whiter, and Yasunobu Ogawa
Ann. Geophys., 40, 1–10, https://doi.org/10.5194/angeo-40-1-2022, https://doi.org/10.5194/angeo-40-1-2022, 2022
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In this study, we present the comparison between an auroral model and EISCAT radar electron densities during pulsating aurorae. We test whether an overpassing satellite measurement of the average energy spectrum is a reasonable estimate for pulsating aurora electron precipitation. When patchy pulsating aurora is dominant in the morning sector, the overpass-averaged spectrum is found to be a reasonable estimate – but not when there is a mix of pulsating aurora types in the post-midnight sector.
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Editorial statement
The study is devoted to a shock auroral event that occurred on February 26, 2023, in northern Scandinavia, and represents the first time such nighttime auroral features have been captured by ground-based cameras. Shock auroras result from a very specific driving impulse in the solar wind. While the primary effects appear on the dayside of the Earth, the authors succeeded in observing the nightside signatures, which are rare and difficult to detect. The study is a successful scientific achievement as it presents newly discovered phenomena that provide new insights into solar wind interactions with the nightside ionosphere.
The study is devoted to a shock auroral event that occurred on February 26, 2023, in northern...
Short summary
Our research explores the shock aurora, which is typically observed on the dayside due to the rapid compression of the Earth's magnetic field. We observed this rare aurora on the nightside, a region where such events are difficult to detect. Using ground-based cameras, we identified new features, including leaping and vortex-like patterns. These findings offer a fresh insight into the interactions between the solar wind and the magnetosphere, enhancing our understanding of space weather and its effects.
Our research explores the shock aurora, which is typically observed on the dayside due to the...
