|
|
 |
|
|
Ann. Geophys., 24, 1919-1930, 2006
www.ann-geophys.net/24/1919/2006/
© European Geosciences Union 2006
Electromagnetic ion-cyclotron instability in the presence of a parallel electric field with general loss-cone distribution function - particle aspect analysis
G. Ahirwar, P. Varma, and M. S. Tiwari
Department of Physics & Electronics, Dr. H. S. Gour University, Sagar (M.P.) – 470003, India
Abstract. The effect of parallel electric field on the growth rate, parallel and
perpendicular resonant energy and marginal stability of the electromagnetic
ion-cyclotron (EMIC) wave with general loss-cone distribution function in a
low β homogeneous plasma is investigated by particle aspect approach.
The effect of the steepness of the loss-cone distribution is investigated on
the electromagnetic ion-cyclotron wave. The whole plasma is considered to
consist of resonant and non-resonant particles. It is assumed that resonant
particles participate in the energy exchange with the wave, whereas
non-resonant particles support the oscillatory motion of the wave. The wave
is assumed to propagate parallel to the static magnetic field. The effect of
the parallel electric field with the general distribution function is to control the
growth rate of the EMIC waves, whereas the effect of steep loss-cone
distribution is to enhance the growth rate and perpendicular heating of the
ions. This study is relevant to the analysis of ion conics in the
presence of an EMIC wave in the auroral acceleration region of the Earth's
magnetoplasma.
Full Article in PDF (1644 KB) |
|
|
