Enhancement of incoherent scatter gyro lines by suprathermal electrons

Details Enhancement of incoherent scatter gyro lines by suprathermal electrons Enhancement of incoherent scatter gyro lines by suprathermal electrons

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jatp...55..667m&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 55, no. 4-5, p. 667-674.

Physics

3

Eiscat Radar System (Europe), Hot Electrons, Ionospheric Electron Density, Resonance Lines, Electrostatic Waves, Maxwell Equation, Power Spectra

Scientific paper

The gyro lines are a pair of resonance lines in the power spectrum of incoherent scatter. They correspond to the electrostatic wavemode omega(g) about equal to Omega(e) cos alpha of a magnetized plasma, where alpha is the angle between the magnetic field and the scattering wave vector and Omega(e) is the electron gyro frequency. The main task of this paper is to study the effect of suprathermal electrons (i.e. precipitating electrons, photoelectrons, and secondary electrons) on the gyro lines. It is shown that the lines can be enhanced if the velocity component of the suprathermal electrons in the direction of the wave matches the phase velocity of the wave. The suprathermal electrons are represented both by a shifted Maxwellian and by a power-law velocity distribution in the calculations.

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