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 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.
Document type :
Journal articles
Complete list of metadatas

Cited literature [77 references]  Display  Hide  Download

https://hal-insu.archives-ouvertes.fr/insu-01960560
Contributor : Nathalie Pothier <>
Submitted on : Wednesday, December 19, 2018 - 2:31:50 PM
Last modification on : Thursday, July 25, 2019 - 4:16:03 PM
Long-term archiving on : Wednesday, March 20, 2019 - 10:12:07 PM

File

7582-20137-1-PB.pdf
Publisher files allowed on an open archive

Identifiers

Citation

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⟩

Share

Metrics

Record views

96

Files downloads

93