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Poster De Conférence Année : 2018

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

E. Parkhomenko
  • Fonction : Auteur
H. V. Malova
  • Fonction : Auteur
E. E. Grigorenko
  • Fonction : Auteur
V. Y. Popov
  • Fonction : Auteur
A. A. Petrukovich
  • Fonction : Auteur
E. A. Kronberg
  • Fonction : Auteur
P. Daly
L. M. Zelenyi
  • Fonction : Auteur

Résumé

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 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 pro- cesses 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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Dates et versions

hal-02860966 , version 1 (08-06-2020)

Identifiants

  • HAL Id : hal-02860966 , version 1

Citer

E. Parkhomenko, H. V. Malova, E. E. Grigorenko, V. Y. Popov, A. A. Petrukovich, et al.. Plasma acceleration on multiscale temporal variations of electric and magnetic fields during substorm dipolarization in the Earth’s magnetotail. EGU General Assembly, Apr 2018, Vienna, Austria. 20, pp.EGU2018-16323-1, 2018. ⟨hal-02860966⟩
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