, E. Aguilar-Rodriguez
, V.V. Tirsky
,
V.M. Tomozov
V.G. Ledenev, E. Aguilar-Rodriguez, V.V. Tirsky,
V.M. Tomozov
Institute of Solar-Terrestrial Physics Siberian Branch of
the Russian Academy of Sciences, Lermontov St. 126, Irkutsk 664033,
Russia
Space Sciences Laboratory, University of California, Berkeley, USA
Institute of Laser Physics, Siberian Branch of the Russian Academy of
Sciences, Irkutsk, Russia
On the base of numerical calculations of dispersion
characteristics of hot plasma eigen oscillations it is shown that the
longitudinal wave spectrum, which excited in solar wind plasma,
extends substantively with increase of refractive index n in a range
of values n 
10. This result allows us to explain a broad band of
emission and constant value of average ratio of frequency-band to
radio emission frequency from interplanetary shock wave fronts. It is
shown that a spectrum of radio emission is determined by spectrum of
Langmuir waves excited upstream of interplanetary shock wave by
adiabatically heated electrons outgoing the shock wave front.