Coupling of electrons and inertial Alfven waves in the topside ionosphere

Run Shi, Huixin Liu, Akimasa Yoshikawa, Beichen Zhang, Binbin Ni

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

A one-dimensional kinetic model is constructed to simulate the electron acceleration by inertial Alfven waves. The electrons are divided into cold and hot electrons and treated separately. Cold components are described by the fluid equation and hot ones by the Vlasov equation, both carrying field-aligned currents. Intense variation of Alfven speed has been introduced by inclusion of cold electrons. The model results show that the exponential decrease of the plasma density plays a key role, which leads to the sharp gradient of both Alfven velocity and electron inertial length. When Alfven waves encounter this sharp gradient at lower altitudes, the electrons accelerated by the waves become super-Alfvenic, and the width of burst structures becomes much wider than the electron inertial length. Consequently, the background electrons carry the oppositely field-aligned current due to plasma oscillation. It is demonstrated that the current carried by the electrons exceeding the wavefront is balanced by the reverse current carried by background electrons. This mechanism can be used to reasonably explain observations of the electron bursts accompanied by little net field-aligned current. Furthermore, our simulation indicates another type of Alfven wave reflection due to mirror force and wave-particle interaction. Key Points Kinetic model which separates the electrons into cold and hot parts Explain the electron bursts accompanied by little net field-aligned current Another type of Alfven wave reflection due to wave-particle interaction

Original languageEnglish
Pages (from-to)2903-2910
Number of pages8
JournalJournal of Geophysical Research: Space Physics
Volume118
Issue number6
DOIs
Publication statusPublished - Jan 1 2013

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Ionosphere
magnetohydrodynamic waves
ionospheres
ionosphere
electrons
electron
Electrons
field aligned currents
bursts
wave-particle interactions
wave reflection
Particle interactions
Vlasov equation
Plasma oscillations
gradients
vlasov equations
Kinetics
plasma
kinetics
electron acceleration

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

Cite this

Coupling of electrons and inertial Alfven waves in the topside ionosphere. / Shi, Run; Liu, Huixin; Yoshikawa, Akimasa; Zhang, Beichen; Ni, Binbin.

In: Journal of Geophysical Research: Space Physics, Vol. 118, No. 6, 01.01.2013, p. 2903-2910.

Research output: Contribution to journalArticle

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