Double power-law spectra of energetic electrons in the Earth magnetotail - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles Annales Geophysicae Year : 2013

Double power-law spectra of energetic electrons in the Earth magnetotail


In this paper, we consider electron acceleration in the vicinity of X-line and corresponding formation of energy spectra. We develop an analytical model including the effect of the electron trapping by electrostatic fields and surfing acceleration. Speiser, Fermi and betatron mechanisms of acceleration are also taken into account. Analytical estimates are verified by the numerical integration of electron trajectories. The surfing mechanism and adiabatic heating are responsible for the formation of the double power-law spectrum in agreement with the previous studies. The energy of the spectrum knee is about ∼150 keV for typical conditions of the Earth magnetotail. We compare theoretical results with the spacecraft observations of electron double power-law spectra in the magnetotail and demonstrate that the theory is able to describe typical energy of the spectra knee. We also estimate the role of relativistic effects and magnetic field fluctuations on the electron acceleration: the acceleration is more stable for relativistic electrons, while fluctuations of the magnetic field cannot significantly decrease the gained energy for typical magnetospheric conditions.
Fichier principal
Vignette du fichier
angeo-31-91-2013.pdf (3.46 Mo) Télécharger le fichier
Origin : Publication funded by an institution

Dates and versions

insu-01174891 , version 1 (10-07-2015)



A.V. Artemyev, M Hoshino, V. N. Lutsenko, A. A. Petrukovich, S Imada, et al.. Double power-law spectra of energetic electrons in the Earth magnetotail. Annales Geophysicae, 2013, 31, pp.91-106. ⟨10.5194/angeo-31-91-2013⟩. ⟨insu-01174891⟩
166 View
127 Download



Gmail Facebook Twitter LinkedIn More