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Title: Excitation of kinetic Alfvén waves by fast electron beams

Energetic electron beams, which are ubiquitous in a large variety of active phenomena in space and astrophysical plasmas, are one of the most important sources that drive plasma instabilities. In this paper, taking account of the return-current effect of fast electron beams, kinetic Alfvén wave (KAW) instability driven by a fast electron beam is investigated in a finite-β plasma of Q < β < 1 (where β is the kinetic-to-magnetic pressure ratio and Q ≡ m{sub e} /m{sub i} is the mass ratio of electrons to ions). The results show that the kinetic resonant interaction of beam electrons is the driving source for KAW instability, unlike the case driven by a fast ion beam, where both the kinetic resonant interaction of beam ions and the return-current are the driving source for the KAW instability. KAW instability has a nonzero growth rate in the range of the perpendicular wave number, 0
Authors:
; ;  [1] ;  [2] ;  [3]
  1. Purple Mountain Observatory, CAS, Nanjing (China)
  2. Xinjiang Astronomical Observatory, CAS, Urumqi 830011 (China)
  3. Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Sciences, Beijing (China)
Publication Date:
OSTI Identifier:
22365053
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 793; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ALFVEN WAVES; ASTROPHYSICS; ELECTRON BEAMS; EXCITATION; ION BEAMS; IONS; KINETIC ENERGY; MASS; PLASMA; PLASMA INSTABILITY; SPACE; SUN; TAIL ELECTRONS; VELOCITY