Articles | Volume 40, issue 3
https://doi.org/10.5194/angeo-40-259-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Special issue:
https://doi.org/10.5194/angeo-40-259-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Regular paper
| 
03 May 2022
Regular paper |
| 03 May 2022
| 03 May 2022
Responses of intermediate layers to geomagnetic activity during the 2009 deep solar minimum over the Brazilian low-latitude sector
Ângela M. Santos
CORRESPONDING AUTHOR
National Institute for Space Research – INPE, São José dos Campos, Brazil
Christiano G. M. Brum
Arecibo Observatory, University of Central Florida, Arecibo, Puerto Rico
Inez S. Batista
National Institute for Space Research – INPE, São José dos Campos, Brazil
José H. A. Sobral
National Institute for Space Research – INPE, São José dos Campos, Brazil
Mangalathayil A. Abdu
National Institute for Space Research – INPE, São José dos Campos, Brazil
Jonas R. Souza
National Institute for Space Research – INPE, São José dos Campos, Brazil
Related authors
Igo Paulino, Ana Roberta Paulino, Ricardo Y. C. Cueva, Ebenezer Agyei-Yeboah, Ricardo Arlen Buriti, Hisao Takahashi, Cristiano Max Wrasse, Ângela M. Santos, Amauri Fragoso de Medeiros, and Inez S. Batista
Ann. Geophys., 38, 437–443, https://doi.org/10.5194/angeo-38-437-2020, https://doi.org/10.5194/angeo-38-437-2020, 2020
Short summary
Short summary
In this paper, an extensive study has been done in order to investigate periodic oscillations in the start times of equatorial plasma bubbles observed over Brazil. Using OI6300 airglow images and ionograms, it was possible to detect semimonthly oscillations in the start times of equatorial plasma bubbles (EPBs) and equatorial Spread-F. This semimonthly oscillation is likely related to the lunar tide, which represents an important mechanism acting in the day-to-day variability of EPBs.
Ângela Machado dos Santos, Inez Staciarini Batista, Mangalathayil Ali Abdu, José Humberto Andrade Sobral, Jonas Rodrigues de Souza, and Christiano Garnett Marques Brum
Ann. Geophys., 37, 1005–1024, https://doi.org/10.5194/angeo-37-1005-2019, https://doi.org/10.5194/angeo-37-1005-2019, 2019
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For the first time, the climatology of intermediate descending layers (~150 km) over Brazilian equatorial and low-latitude regions during the extreme solar minimum period of 2009 was investigated. The results are interesting and innovative. For this analysis we used data of height and top frequency of intermediate layers collected from a digisonde located at São Luis and Cachoreira Paulista.
Mangalathayil A. Abdu, Paulo A. B. Nogueira, Angela M. Santos, Jonas R. de Souza, Inez S. Batista, and Jose H. A. Sobral
Ann. Geophys., 36, 609–620, https://doi.org/10.5194/angeo-36-609-2018, https://doi.org/10.5194/angeo-36-609-2018, 2018
Short summary
Short summary
Equatorial ionospheric irregularities have a significant detrimental impact on a variety of space application systems in navigation and communication areas that utilize satellites, especially the Global Navigation Satellite Systems (GNSS) network. The development of these irregularities in the nighttime ionosphere is controlled primarily by ionospheric electric fields and instabilities. The effect of magnetic disturbance on these electric fields and on the irregularities is investigated here.
Ângela M. Santos, Mangalathayil A. Abdu, Jonas R. Souza, Inez S. Batista, and José H. A. Sobral
Ann. Geophys., 35, 1219–1229, https://doi.org/10.5194/angeo-35-1219-2017, https://doi.org/10.5194/angeo-35-1219-2017, 2017
Short summary
Short summary
This paper analyzes the influence of the recent deep and prolonged solar minimum on the daytime zonal and vertical plasma drift velocities during quiet time over Jicamarca, Peru. Our results show that an anomalously low zonal wind was mainly responsible for the observed anomalous behavior in the zonal drift followed by a decrease in the E-region conductivity and the dynamo electric field during 2008.
Ana Roberta Paulino, Fabiano da Silva Araújo, Igo Paulino, Cristiano Max Wrasse, Lourivaldo Mota Lima, Paulo Prado Batista, and Inez Staciarini Batista
Ann. Geophys., 39, 151–164, https://doi.org/10.5194/angeo-39-151-2021, https://doi.org/10.5194/angeo-39-151-2021, 2021
Short summary
Short summary
Long- and short-period oscillations in the lunar semidiurnal tidal amplitudes in the ionosphere derived from the total electron content were investigated over Brazil from 2011 to 2014. The results showed annual, semiannual and triannual oscillations as the dominant components. Additionally, the most pronounced short-period oscillations were observed between 7 and 11 d, which suggest a possible coupling of the lunar tide and planetary waves.
Igo Paulino, Ana Roberta Paulino, Ricardo Y. C. Cueva, Ebenezer Agyei-Yeboah, Ricardo Arlen Buriti, Hisao Takahashi, Cristiano Max Wrasse, Ângela M. Santos, Amauri Fragoso de Medeiros, and Inez S. Batista
Ann. Geophys., 38, 437–443, https://doi.org/10.5194/angeo-38-437-2020, https://doi.org/10.5194/angeo-38-437-2020, 2020
Short summary
Short summary
In this paper, an extensive study has been done in order to investigate periodic oscillations in the start times of equatorial plasma bubbles observed over Brazil. Using OI6300 airglow images and ionograms, it was possible to detect semimonthly oscillations in the start times of equatorial plasma bubbles (EPBs) and equatorial Spread-F. This semimonthly oscillation is likely related to the lunar tide, which represents an important mechanism acting in the day-to-day variability of EPBs.
Telmo dos Santos Klipp, Adriano Petry, Jonas Rodrigues de Souza, Eurico Rodrigues de Paula, Gabriel Sandim Falcão, and Haroldo Fraga de Campos Velho
Ann. Geophys., 38, 347–357, https://doi.org/10.5194/angeo-38-347-2020, https://doi.org/10.5194/angeo-38-347-2020, 2020
Ângela Machado dos Santos, Inez Staciarini Batista, Mangalathayil Ali Abdu, José Humberto Andrade Sobral, Jonas Rodrigues de Souza, and Christiano Garnett Marques Brum
Ann. Geophys., 37, 1005–1024, https://doi.org/10.5194/angeo-37-1005-2019, https://doi.org/10.5194/angeo-37-1005-2019, 2019
Short summary
Short summary
For the first time, the climatology of intermediate descending layers (~150 km) over Brazilian equatorial and low-latitude regions during the extreme solar minimum period of 2009 was investigated. The results are interesting and innovative. For this analysis we used data of height and top frequency of intermediate layers collected from a digisonde located at São Luis and Cachoreira Paulista.
Claudia M. N. Candido, Jiankui Shi, Inez S. Batista, Fabio Becker-Guedes, Emília Correia, Mangalathayil A. Abdu, Jonathan Makela, Nanan Balan, Narayan Chapagain, Chi Wang, and Zhengkuan Liu
Ann. Geophys., 37, 657–672, https://doi.org/10.5194/angeo-37-657-2019, https://doi.org/10.5194/angeo-37-657-2019, 2019
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This study concerns postmidnight ionospheric irregularities observed during low solar activity conditions. We analyze data from digisondes and optical imaging systems located in an equatorial region over Brazil. The results show that they occur under unfavorable and unexpected conditions. This work can be useful for space weather forecasting during low solar activity.
Mangalathayil A. Abdu, Paulo A. B. Nogueira, Angela M. Santos, Jonas R. de Souza, Inez S. Batista, and Jose H. A. Sobral
Ann. Geophys., 36, 609–620, https://doi.org/10.5194/angeo-36-609-2018, https://doi.org/10.5194/angeo-36-609-2018, 2018
Short summary
Short summary
Equatorial ionospheric irregularities have a significant detrimental impact on a variety of space application systems in navigation and communication areas that utilize satellites, especially the Global Navigation Satellite Systems (GNSS) network. The development of these irregularities in the nighttime ionosphere is controlled primarily by ionospheric electric fields and instabilities. The effect of magnetic disturbance on these electric fields and on the irregularities is investigated here.
Laysa C. A. Resende, Christina Arras, Inez S. Batista, Clezio M. Denardini, Thainá O. Bertollotto, and Juliano Moro
Ann. Geophys., 36, 587–593, https://doi.org/10.5194/angeo-36-587-2018, https://doi.org/10.5194/angeo-36-587-2018, 2018
Short summary
Short summary
We present new results on the behavior of sporadic E layers (Es layers) using GPS (global positioning system) radio occultation (RO) measurements obtained from the FORMOSAT-3/COSMIC satellites and digisonde data over Cachoeira Paulista, a low-latitude station in Brazil.
Jonas Sousasantos, Alison de Oliveira Moraes, José H. A. Sobral, Marcio T. A. H. Muella, Eurico R. de Paula, and Rafael S. Paolini
Ann. Geophys., 36, 565–576, https://doi.org/10.5194/angeo-36-565-2018, https://doi.org/10.5194/angeo-36-565-2018, 2018
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This work presents an analysis of the scintillation onset over the southern Brazil based on data from two solar maximum periods and simulation of the ionospheric conditions before the scintillation onset. The results shows some patterns which may help to prevent several satellite-based technological applications suffering disruptions due to scintillation issues.
Amelia Naomi Onohara, Inez Staciarini Batista, and Paulo Prado Batista
Ann. Geophys., 36, 459–471, https://doi.org/10.5194/angeo-36-459-2018, https://doi.org/10.5194/angeo-36-459-2018, 2018
Short summary
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Global coverage measurements made by satellites have provided observational studies which have shown the presence of four peaks in global longitudinal structures from global local time observations of equatorial ionization anomalies. The structures seen in the ionosphere are related to the diurnal non-migrating wave that comes from the troposphere and can be noticed in periods of low and high solar activity in the low-latitude ionosphere regions, mainly at altitudes from ~ 250 km up to ~ 800 km.
Jonas Sousasantos, José Humberto Andrade Sobral, Esfhan Alam Kherani, Marcelo Magalhães Fares Saba, and Diovane Rodolfo de Campos
Ann. Geophys., 36, 349–360, https://doi.org/10.5194/angeo-36-349-2018, https://doi.org/10.5194/angeo-36-349-2018, 2018
Short summary
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The relationship between the tropospheric convection and the ionospheric phenomenology have been investigated in recent decades. In this work a relation between the lightning strike activity and the characteristics of the equatorial spread-F events is analyzed over the Brazilian region, and the results seem to support the hypothesis of some indirect interrelationship between both distinct phenomena.
Paulo A. B. Nogueira, Mangalathayil A. Abdu, Jonas R. Souza, Clezio M. Denardini, Paulo F. Barbosa Neto, João P. Serra de Souza da Costa, and Ana P. M. Silva
Ann. Geophys., 36, 139–147, https://doi.org/10.5194/angeo-36-139-2018, https://doi.org/10.5194/angeo-36-139-2018, 2018
Short summary
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We have analyzed the low-latitude ionospheric responses to solar flares. In particular we show for the first time that 5 to 8 min of time delay is present in the peak effect in the EEJ, with respect that of Sq current outside the magnetic equator, in response to the flare radiation enhancement. We propose that the flare induced enhancement in neutral wind occurring with a time delay could be responsible for a delayed zonal electric field disturbance driving the EEJ.
Ângela M. Santos, Mangalathayil A. Abdu, Jonas R. Souza, Inez S. Batista, and José H. A. Sobral
Ann. Geophys., 35, 1219–1229, https://doi.org/10.5194/angeo-35-1219-2017, https://doi.org/10.5194/angeo-35-1219-2017, 2017
Short summary
Short summary
This paper analyzes the influence of the recent deep and prolonged solar minimum on the daytime zonal and vertical plasma drift velocities during quiet time over Jicamarca, Peru. Our results show that an anomalously low zonal wind was mainly responsible for the observed anomalous behavior in the zonal drift followed by a decrease in the E-region conductivity and the dynamo electric field during 2008.
Regia Pereira Silva, Jose Humberto Andrade Sobral, Daiki Koga, and Jonas Rodrigues Souza
Ann. Geophys., 35, 1165–1176, https://doi.org/10.5194/angeo-35-1165-2017, https://doi.org/10.5194/angeo-35-1165-2017, 2017
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In this work the response of the Brazilian equatorial ionosphere is studied during three HILDCAA events that occurred in the year of 2006 using the digisonde data. Geomagnetic indices and interplanetary parameters were used to calculate a cross-correlation coefficient between the Ey and the hmF2. The results showed that the pumping action of particle precipitation into the auroral zone has moderately modified the equatorial hmF2, being more sensitive during PRE time.
Cosme Alexandre O. B. Figueiredo, Ricardo A. Buriti, Igo Paulino, John W. Meriwether, Jonathan J. Makela, Inez S. Batista, Diego Barros, and Amauri F. Medeiros
Ann. Geophys., 35, 953–963, https://doi.org/10.5194/angeo-35-953-2017, https://doi.org/10.5194/angeo-35-953-2017, 2017
I. Paulino, A. F. Medeiros, S. L. Vadas, C. M. Wrasse, H. Takahashi, R. A. Buriti, D. Leite, S. Filgueira, J. V. Bageston, J. H. A. Sobral, and D. Gobbi
Ann. Geophys., 34, 293–301, https://doi.org/10.5194/angeo-34-293-2016, https://doi.org/10.5194/angeo-34-293-2016, 2016
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Periodic waves have been observed over São João do Cariri during almost one solar cycle. Similarities between the characteristics of these events with observations at other places around the world were noted, primarily the spectral parameters. Most observed waves have appeared during magnetically quiet nights, and the occurrence of those waves followed the solar activity. Due to their characteristics, most of them must have had different generation mechanisms from the Perkins instability.
A. N. Onohara, I. S. Batista, and H. Takahashi
Ann. Geophys., 31, 209–215, https://doi.org/10.5194/angeo-31-209-2013, https://doi.org/10.5194/angeo-31-209-2013, 2013
Related subject area
Subject: Earth's ionosphere & aeronomy | Keywords: Ionosphere–magnetosphere interactions
Ionospheric upwelling and the level of associated noise at solar minimum
Three principal components describe the spatiotemporal development of mesoscale ionospheric equivalent currents around substorm onsets
Parallel electric fields produced by ionospheric injection
A comparison of Jason-2 plasmasphere electron content measurements with ground-based measurements
Multi-instrument observations of polar cap patches and traveling ionospheric disturbances generated by solar wind Alfvén waves coupling to the dayside magnetosphere
Whistler waves produced by monochromatic currents in the low nighttime ionosphere
Ionospheric control of space weather
Swarm field-aligned currents during a severe magnetic storm of September 2017
Timothy Wemimo David, Chizurumoke Michael Michael, Darren Wright, Adetoro Temitope Talabi, and Abayomi Ekundayo Ajetunmobi
Ann. Geophys., 42, 349–354, https://doi.org/10.5194/angeo-42-349-2024, https://doi.org/10.5194/angeo-42-349-2024, 2024
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The Earth’s upper atmospheres are dominated by matter also known as plasma. These plasmas can flow from the lower region, the ionosphere, to the further-up region, the magnetosphere, which is described as upwelling. We analyse data for ionospheric upwelling over the solar minimum period. A main finding is that the noise or rejected data in the dataset were predominant around the local evening and in winter and minimum around local noon and in summer.
Liisa Juusola, Ari Viljanen, Noora Partamies, Heikki Vanhamäki, Mirjam Kellinsalmi, and Simon Walker
Ann. Geophys., 41, 483–510, https://doi.org/10.5194/angeo-41-483-2023, https://doi.org/10.5194/angeo-41-483-2023, 2023
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At times when auroras erupt on the sky, the magnetic field surrounding the Earth undergoes rapid changes. On the ground, these changes can induce harmful electric currents in technological conductor networks, such as powerlines. We have used magnetic field observations from northern Europe during 28 such events and found consistent behavior that can help to understand, and thus predict, the processes that drive auroras and geomagnetically induced currents.
Osuke Saka
Ann. Geophys., 41, 369–373, https://doi.org/10.5194/angeo-41-369-2023, https://doi.org/10.5194/angeo-41-369-2023, 2023
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Transverse electric fields transmitted from the magnetosphere and those generated by the neutral winds yield a local breakdown of the charge neutrality at the boundaries between the thermosphere and mesosphere. The breakdown may create parallel electric fields in the thermosphere to produce spiral auroras and outflows. This explanation supposes an auroral generator located not in a distant space, but rather in our much nearer upper atmosphere.
Andrew J. Mazzella Jr. and Endawoke Yizengaw
Ann. Geophys., 41, 269–280, https://doi.org/10.5194/angeo-41-269-2023, https://doi.org/10.5194/angeo-41-269-2023, 2023
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Global Positioning System (GPS) measurements of plasmasphere electron content (PEC) by Jason-2 are compared to PEC for ground-based GPS receivers in Africa. Jason-2 vertical PEC measurements corroborated the ground-based measurements, and its co-aligned slant PEC values were generally close to the ground-based slant PEC values. This correspondence indicates that the Jason-2 PEC measurements could be used to resolve some ambiguities in the determination of the ground-based PEC values.
Paul Prikryl, Robert G. Gillies, David R. Themens, James M. Weygand, Evan G. Thomas, and Shibaji Chakraborty
Ann. Geophys., 40, 619–639, https://doi.org/10.5194/angeo-40-619-2022, https://doi.org/10.5194/angeo-40-619-2022, 2022
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The solar wind interaction with Earth’s magnetic field deposits energy into the upper portion of the atmosphere at high latitudes. The coupling process that modulates the ionospheric convection and intensity of ionospheric currents leads to formation of densely ionized patches convecting across the polar cap. The ionospheric currents launch traveling ionospheric disturbances (TIDs) propagating equatorward. The polar cap patches and TIDs are then observed by networks of radars and GPS receivers.
Vera G. Mizonova and Peter A. Bespalov
Ann. Geophys., 39, 479–486, https://doi.org/10.5194/angeo-39-479-2021, https://doi.org/10.5194/angeo-39-479-2021, 2021
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The paper discusses the excitation of monochromatic ELF/VLF electromagnetic waves produced by HF heating facility currents in the nighttime ionosphere. The ground-based magnetic field is predominantly located under the source, and the wave has right-hand polarization typical for a whistler but left-hand polarization at large distances from the source. About half of the source energy propagates upward, and approximately 20 % propagates to the Earth–ionosphere waveguide.
Osuke Saka
Ann. Geophys., 39, 455–460, https://doi.org/10.5194/angeo-39-455-2021, https://doi.org/10.5194/angeo-39-455-2021, 2021
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The ionosphere is a partly ionized medium above the atmosphere. Because of its anisotropic properties, the imposed electric fields from the magnetosphere produce space charge. Polarization electric fields induced in the ionosphere by this process generate ion drifts (Pedersen currents) and plasma evaporation along the field lines, thus achieving a quasi-neutral equilibrium of the ionosphere. The evaporation grows as a large-scale parallel potential structure in the magnetosphere.
Renata Lukianova
Ann. Geophys., 38, 191–206, https://doi.org/10.5194/angeo-38-191-2020, https://doi.org/10.5194/angeo-38-191-2020, 2020
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During the most intense storm of solar cycle 24, the magnetosphere–ionosphere interaction, which is primarily associated with field-aligned currents (FACs), was much stronger than usual. Measurements onboard the low-latitude polar-orbiting Swarm satellites have shown that the intensities of FACs increase dramatically during the storm-time substorms. The extreme values of 1 s (7.5 km width) FACs reach 80 μA m−2. The lowest latitude of the FAC region is limited to 49–50 MLat.
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Short summary
Using the Digisonde data this paper shows that the small variation in the geomagnetic activity during low solar activity can affect both the parameter of height and the frequency of the intermediate layer (ILs) over the low-latitude Brazilian sector. The most expressive responses of the ILs to geomagnetic activity were observed during the summer when the height of the ILs suffered a significant decrease with the increase of the magnetic activity magnetic in the first hours of the day.
Using the Digisonde data this paper shows that the small variation in the geomagnetic activity...
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