Articles | Volume 37, issue 5
https://doi.org/10.5194/angeo-37-919-2019
© Author(s) 2019. 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-37-919-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Wavelet analysis of the magnetotail response to solar wind fluctuations during HILDCAA events
Adriane Marques de Souza Franco
CORRESPONDING AUTHOR
Space Geophysics Department, National Institute for Space Research
(INPE), Sao Jose dos Campos, 12227-010, Brazil
Ezequiel Echer
Space Geophysics Department, National Institute for Space Research
(INPE), Sao Jose dos Campos, 12227-010, Brazil
Mauricio José Alves Bolzan
Astronomy and Space Physics Laboratory, Federal University of
Jataí, Jataí, 75801-615, Brazil
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EGUsphere, https://doi.org/10.5194/egusphere-2025-4911, https://doi.org/10.5194/egusphere-2025-4911, 2025
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This study analyzed 40 corotating interaction region driven geomagnetic storms to see how they affect Earth's magnetic tail. We found that short, rapid energy pulses (4 hours) dominated the magnetotail (cyclic substorm periods). Further, the HILDCAA events that occur during the recovery phase could cause a spread of energy to periodicities of 2 to 12 h in the auroral region. Spectral indices results suggest a strong turbulence in the magnetotail and auroral regions during recovery phases.
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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.
Adriane Marques de Souza Franco, Rashmi Rawat, Mauricio José Alves Bolzan, and Ezequiel Echer
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This study analyzed 40 corotating interaction region driven geomagnetic storms to see how they affect Earth's magnetic tail. We found that short, rapid energy pulses (4 hours) dominated the magnetotail (cyclic substorm periods). Further, the HILDCAA events that occur during the recovery phase could cause a spread of energy to periodicities of 2 to 12 h in the auroral region. Spectral indices results suggest a strong turbulence in the magnetotail and auroral regions during recovery phases.
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On February 03 2022, SpaceX launched a new group of satellites for its Starlink constellation. This launch simultaneously released 49 satellites into orbits between 200 km and 250 km height. The launches occurred during a geomagnetic storm that was followed by a second storm. There was an immediate loss of 32 satellites. The satellite losses may have been caused by an unusually high level of atmospheric drag (unexplained by current theory or modeling) or a high level of satellite collisions.
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.
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Short summary
The wavelet transform was employed in nine HILDCAA events for intervals in which the Cluster crossed the magnetotail in order to identify the most energetic periods of these events in the magnetotail. It was seen that 76 % of the periods identified are ≤4 h. Using the cross wavelet analysis technique between Bz–IMF components and the Bx geomagnetic components, it was identified that the coupling of energy is stronger in periods between 2 and 4 h, which are typical substorm periods.
The wavelet transform was employed in nine HILDCAA events for intervals in which the Cluster...
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