Plasma acceleration on multiscale temporal variations of electric and magnetic fields during substorm dipolarization in the Earth’s magnetotail
- Abstract
Magnetic field dipolarizations are often observed in the magnetotail during substorms. These generally include three temporal scales: (1) actual dipolarization when the normal magnetic field changes during several minutes from minimum to maximum level ; (2) sharp 15Bz\"> bursts (pulses) interpreted as the passage of multiple dipolarization fronts with characteristic time scales < 1 min, and (3) bursts of electric and magnetic fluctuations with frequencies up to electron gyrofrequency occurring at the smallest time scales (≤ 1 s). We present a numerical model where the contributions of the above processes (1)-(3) in particle acceleration are analyzed. It is shown that these processes have a resonant character at different temporal scales. While O+ ions are more likely accelerated due to the mechanism (1), H+ ions (and to some extent electrons) are effectively accelerated due to the second mechanism. High-frequency electric and magnetic fluctuations accompanying magnetic dipolarization as in (3) are also found to efficiently accelerate electrons.
- Further Information
- https://www.annalsofgeophysics.eu/index.php/annals/article/view/7582
- BibTeX
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@article{id2430, author = {Parkhomenko, Elena and Malova, Helmi and Grigorenko, Elena and Popov, Victor and Petrukovich, Anatolii and Delcourt, Dominique and Kronberg, Elena and Daly, Patrick and Zelenyi, Lev}, journal = {Annals of Geophysics}, language = {en}, number = {3}, title = {Plasma acceleration on multiscale temporal variations of electric and magnetic fields during substorm dipolarization in the Earth{\textquoteright}s magnetotail}, url = {https://www.annalsofgeophysics.eu/index.php/annals/article/view/7582}, volume = {61}, year = {2018}, }
- EndNote
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%O Journal Article %A Parkhomenko, Elena %A Malova, Helmi %A Grigorenko, Elena %A Popov, Victor %A Petrukovich, Anatolii %A Delcourt, Dominique %A Kronberg, Elena %A Daly, Patrick %A Zelenyi, Lev %J Annals of Geophysics %G en %N 3 %T Plasma acceleration on multiscale temporal variations of electric and magnetic fields during substorm dipolarization in the Earth’s magnetotail %U https://www.annalsofgeophysics.eu/index.php/annals/article/view/7582 %V 61 %D 2018