Plasma acceleration on multiscale temporal variations of electric and magnetic fields during substorm dipolarization in the Earth’s magnetotail

Elena Parkhomenko 1 Helmi Vitalevna-Malova 1 Elena Evgenevna-Grigorenko 1 Victor Yurevich-Popov 1 Anatolii Alekseevich-Petrukovich 1 Dominique Delcourt 2, 3 Elena Aleksandrovna-Kronberg 4 Patrick W. Daly 4 Lev Matveevich-Zelenyi 1
1 IKI - Space Research Institute of the Russian Academy of Sciences
2 LPP - Laboratoire de Physique des Plasmas
3 LPC2E - Laboratoire de Physique et Chimie de l'Environnement et de l'Espace
4 MPS - Max Planck Institute for Solar System Research
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 Bz 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.
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Elena Parkhomenko, Helmi Vitalevna-Malova, Elena Evgenevna-Grigorenko, Victor Yurevich-Popov, Anatolii Alekseevich-Petrukovich, et al.. Plasma acceleration on multiscale temporal variations of electric and magnetic fields during substorm dipolarization in the Earth’s magnetotail. Annals of Geophysics, Istituto Nazionale di Geofisica e Vulcanologia (INGV), 2018, 61 (3), pp.GM334. ⟨10.4401/ag-7582⟩. ⟨insu-01960560⟩

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