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Low-frequency electrostatic instability due to anti-loss-cone electrons

Published online by Cambridge University Press:  13 March 2009

K. G. Bhatia  and
G. S. Lakhina
K. G. Bhatia
Affiliation:
Indian Institute of Geomagnetism, Colaba, Bombay 400 005, India
G. S. Lakhina
Affiliation:
Indian Institute of Geomagnetism, Colaba, Bombay 400 005, India
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Abstract

The energetic anti-loss-cone electrons can drive a low-frequency electrostatic instability, propagating transverse to the ambient magnetic field, in the presence of a cold plasma. The typical real frequency and growth rates associated with this instabifity are respectively, of the order of (ωp being the proton cyclotron frequency). The instability has a transverse wavelength ⋍10ρe (ρe being the Larmor radius of energetic electrons). For the parameters pertinent to auroral plasma at 1RE, the quasi-linear analysis shows that the instability can give rise to an oscillating electric field Esat ⋍0.5−25 mV/ m and an increase of 100–103 K in the temperature of cold electrons. The instability may be relevant to recent observations of low-frequency turbulence on the auroral field lines.

Type
Research Article
Information
Journal of Plasma Physics , Volume 24 , Issue 2 , October 1980 , pp. 221 - 227
Copyright
Copyright © Cambridge University Press 1980

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