Journal articles
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.
Cited literature [77 references]
https://hal-insu.archives-ouvertes.fr/insu-01960560
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Submitted on : Wednesday, December 19, 2018 - 2:31:50 PM
Last modification on : Tuesday, January 4, 2022 - 4:50:10 AM
Long-term archiving on: : Wednesday, March 20, 2019 - 10:12:07 PM
Contributor : Nathalie Pothier Connect in order to contact the contributor
Submitted on : Wednesday, December 19, 2018 - 2:31:50 PM
Last modification on : Tuesday, January 4, 2022 - 4:50:10 AM
Long-term archiving on: : Wednesday, March 20, 2019 - 10:12:07 PM
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