Articles | Volume 36, issue 5
https://doi.org/10.5194/angeo-36-1439-2018
© Author(s) 2018. 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-36-1439-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Regular paper
| 
23 Oct 2018
Regular paper |
| 23 Oct 2018
| 23 Oct 2018
Dynamics of a geomagnetic storm on 7–10 September 2015 as observed by TWINS and simulated by CIMI
Department of Physics, Auburn University, Auburn, AL 36849, USA
James Edmond
Department of Physics, Auburn University, Auburn, AL 36849, USA
Shannon Hill
Physics Department, Emory University, Atlanta, GA 30322, USA
Hanyun Xu
Department of Physics, Auburn University, Auburn, AL 36849, USA
Natalia Buzulukova
Geospace Physics, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA
Mei-Ching Fok
Geospace Physics, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA
Jerry Goldstein
Space Science and Engineering Department, Southwest Research Institute, San Antonio, TX 78228, USA
Department of Physics and Astronomy, University of Texas at San Antonio, San Antonio, TX 78249, USA
David J. McComas
Department of Astrophysical Sciences, Princeton University, NJ 08540,
USA
Phil Valek
Space Science and Engineering Department, Southwest Research Institute, San Antonio, TX 78228, USA
Department of Physics and Astronomy, University of Texas at San Antonio, San Antonio, TX 78249, USA
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Natalia Buzulukova, Jerry Goldstein, Mei-Ching Fok, Alex Glocer, Phil Valek, David McComas, Haje Korth, and Brian Anderson
Ann. Geophys., 36, 107–124, https://doi.org/10.5194/angeo-36-107-2018, https://doi.org/10.5194/angeo-36-107-2018, 2018
Short summary
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The paper presents a case study of Earth's magnetosphere dynamics during the geomagnetic storm of 14–16 November 2012. We use a recently developed global model of the magnetosphere that combines a 3-D magnetohydrodynamics model with a kinetic bounce-averaged model for a representation of the energetic ring current population (1–200 keV). We use the model together with multipoint measurements to understand the observations and provide insight into magnetosphere–ionosphere coupling aspects.
N. A. Schwadron, P. Frisch, F. C. Adams, E. R. Christian, P. Desiati, H. O. Funsten, J. R. Jokipii, D. J. McComas, E. Moebius, and G. Zank
ASTRA Proc., 2, 9–16, https://doi.org/10.5194/ap-2-9-2015, https://doi.org/10.5194/ap-2-9-2015, 2015
Short summary
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We develop a simple diffusive model of the propagation of cosmic rays and the associated cosmic ray anisotropy due to cosmic ray streaming against the local interstellar flow. We show that the local plasma and field conditions sampled by IBEX provide characteristics that consistently explain TeV cosmic ray anisotropies. These results support models that place the interstellar magnetic field direction near the center of the IBEX ribbon.
Related subject area
Subject: Magnetosphere & space plasma physics | Keywords: Storms and substorms
Probabilistic modelling of substorm occurrences with an echo state network
The record of the magnetic storm on 15 May 1921 in Stará Ďala (present-day Hurbanovo) and its compliance with the global picture of this extreme event
Echo state network model for analyzing solar-wind effects on the AU and AL indices
Seasonal features of geomagnetic activity: a study on the solar activity dependence
Polar substorm on 7 December 2015: preonset phenomena and features of auroral breakup
Response of the low- to mid-latitude ionosphere to the geomagnetic storm of September 2017
Influence of the Earth's ring current strength on Størmer's allowed and forbidden regions of charged particle motion
Shin'ya Nakano, Ryuho Kataoka, Masahito Nosé, and Jesper W. Gjerloev
Ann. Geophys., 41, 529–539, https://doi.org/10.5194/angeo-41-529-2023, https://doi.org/10.5194/angeo-41-529-2023, 2023
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Substorms are a phenomenon in the magnetosphere–ionosphere system, which are characterised by brightening of an auroral arc and enhancement of electric currents in the polar ionosphere. Since substorms are difficult to predict, this study treats a substorm occurrence as a stochastic phenomenon and represents the substorm occurrence rate with a machine learning model. We then analyse the response of substorm activity to solar wind conditions by feeding synthetic solar wind data into the model.
Eduard Koči and Fridrich Valach
Ann. Geophys., 41, 355–368, https://doi.org/10.5194/angeo-41-355-2023, https://doi.org/10.5194/angeo-41-355-2023, 2023
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We dealt with the most intense magnetic storm of the 20th century, which took place on 13–15 May 1921. It was also observed at Stará Ďala (present-day Hurbanovo). However, the record was not complete. We estimated the missing sensitivity scale values and presented the resulting digitized Stará Ďala’s data for 13–15 May 1921. The data were compared with the records from other observatories. The analysis suggests that the auroral oval got close to Stará Ďala in the morning hours on 15 May 1921.
Shin'ya Nakano and Ryuho Kataoka
Ann. Geophys., 40, 11–22, https://doi.org/10.5194/angeo-40-11-2022, https://doi.org/10.5194/angeo-40-11-2022, 2022
Short summary
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The relationships between auroral activity and the solar-wind conditions are modeled with a machine-learning technique. The impact of various solar-wind parameters on the auroral activity is then evaluated by putting artificial inputs into the trained machine-learning model. One of the notable findings is that the solar-wind density effect on the auroral activity is emphasized under high solar-wind speed and weak solar-wind magnetic field.
Adriane Marques de Souza Franco, Rajkumar Hajra, Ezequiel Echer, and Mauricio José Alves Bolzan
Ann. Geophys., 39, 929–943, https://doi.org/10.5194/angeo-39-929-2021, https://doi.org/10.5194/angeo-39-929-2021, 2021
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We used up-to-date substorms, HILDCAAs and geomagnetic storms of varying intensity along with all available geomagnetic indices during the space exploration era to explore the seasonal features of the geomagnetic activity and their drivers. As substorms, HILDCAAs and magnetic storms of varying intensity have varying solar/interplanetary drivers, such a study is important for acomplete understanding of the seasonal features of the geomagnetic response to the solar/interplanetary events.
Vladimir V. Safargaleev, Alexander E. Kozlovsky, and Valery M. Mitrofanov
Ann. Geophys., 38, 901–918, https://doi.org/10.5194/angeo-38-901-2020, https://doi.org/10.5194/angeo-38-901-2020, 2020
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Comprehensive analysis of a moderate substorm was performed using optical observations inside the auroral oval and in the polar cap, combined with data from satellites, radars, and ground magnetometers. The onset took place near the poleward boundary of the auroral oval that is not typical for classical substorms. The data fit to the near-tail current disruption scenario of the substorm onset. The role of the 15 min oscillations in the IMF Bz component in the substorm initiation is discussed.
Nadia Imtiaz, Waqar Younas, and Majid Khan
Ann. Geophys., 38, 359–372, https://doi.org/10.5194/angeo-38-359-2020, https://doi.org/10.5194/angeo-38-359-2020, 2020
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We study the impact of the geomagnetic storm of 7–9 September 2017 on the low- to mid-latitude ionosphere. The study is based on the analysis of data from the Global Positioning System (GPS) stations and magnetic observatories located at different longitudinal sectors corresponding to the Pacific, Asia, Africa and the Americas during the period 4–14 September 2017. The GPS data are used to derive the global, regional and vertical total electron content (vTEC) in the four selected regions.
Alexander S. Lavrukhin, Igor I. Alexeev, and Ilya V. Tyutin
Ann. Geophys., 37, 535–547, https://doi.org/10.5194/angeo-37-535-2019, https://doi.org/10.5194/angeo-37-535-2019, 2019
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This paper concerns the question of whether the maximum Earth ring current strength exists and at which moment the ring current can start to break up, thus making a new mechanism of the ring current decrease during the magnetic storm. We study this effect using the Stormer theory of particle motion. After transition of critical strength, Stormer's inner trapping region opens up and the ring current charged particles get the opportunity to leave it, thus decreasing the current strength.
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Short summary
Pressure and anisotropy profiles from trapped ions in the ring current as observed from energetic neutral atom images are compared to numerical simulations for the first time. The results show evidence for short time and spatially localized injections from the plasma sheet.
Pressure and anisotropy profiles from trapped ions in the ring current as observed from...
