Access Restriction

Author Singh, S. V. ♦ Reddy, R. V. ♦ Lakhina, G. S.
Source Indian Institute of Geomagnetism
Content type Text
File Format PDF
Copyright Year ©2009
Language English
Subject Keyword Broadband Electrostatic Noise ♦ Low-Frequency Waves ♦ Magnetosphere ♦ Ben
Abstract Broadband electrostatic noise (BEN) is commonly observed in different regions of the Earth’s magnetosphere, eg., auroral region, plasma sheet boundary layer, etc. The frequency of these BENs lies in the range from lower hybrid to the local electron plasma frequency and sometimes even higher. Spacecraft observations suggest that the high and low-frequency parts of BEN appear to be two different wave modes. There is a well established theory for the high-frequency part which can be explained by electrostatic solitary waves, however, low-frequency part is yet to be fully understood. The linear theory of low-frequency waves is developed in a four-component magnetized plasma consisting of three types of electrons, namely cold background electron, warm electrons, warm electron beam and ions. The electrostatic dispersion relation is solved, both analytically and numerically. For the parameters relevant to the auroral region, our analysis predict excitation of electron acoustic waves in the frequency range of 17 Hz to 2.6 kHz with transverse wavelengths in range of (1–70) km. The results from this model may be applied to explain some features of the low-frequency part of the broadband electrostatic noise observed in other regions of the magnetosphere.
Education Level UG and PG
Learning Resource Type Article
Accession No. 091042
Journal Advances in Space Research
Volume Number 43
Issue Number 12
Page Count 5
Starting Page 1940
Ending Page 1944