Plasma acceleration on multiscale temporal variations of electric and magnetic fields during substorm dipolarization in the Earth’s magnetotail - Archive ouverte HAL Access content directly
Journal Articles Annals of Geophysics Year : 2018

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

(1) , (1) , (1) , (1) , (1) , (2, 3) , (4) , (4) , (1)
1
2
3
4

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.
Fichier principal
Vignette du fichier
7582-20137-1-PB.pdf (1.03 Mo) Télécharger le fichier
Origin : Publisher files allowed on an open archive
Loading...

Dates and versions

insu-01960560 , version 1 (19-12-2018)

Identifiers

Cite

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, 2018, 61 (3), pp.GM334. ⟨10.4401/ag-7582⟩. ⟨insu-01960560⟩
104 View
102 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More