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Electron Velocity Distribution Function in a Plasma with Temperature Gradient and in the Presence of Suprathermal Electrons: Application to Incoherent-scatter Plasma Lines : Volume 16, Issue 10 (30/11/-0001)

By Guio, P.

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Book Id: WPLBN0003972797
Format Type: PDF Article :
File Size: Pages 15
Reproduction Date: 2015

Title: Electron Velocity Distribution Function in a Plasma with Temperature Gradient and in the Presence of Suprathermal Electrons: Application to Incoherent-scatter Plasma Lines : Volume 16, Issue 10 (30/11/-0001)  
Author: Guio, P.
Volume: Vol. 16, Issue 10
Language: English
Subject: Science, Annales, Geophysicae
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
-0001
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

APA MLA Chicago

Kofman, W., Bjørnå, N., Lilensten, J., & Guio, P. (-0001). Electron Velocity Distribution Function in a Plasma with Temperature Gradient and in the Presence of Suprathermal Electrons: Application to Incoherent-scatter Plasma Lines : Volume 16, Issue 10 (30/11/-0001). Retrieved from http://www.ebooklibrary.org/


Description
Description: The Auroral Observatory, University of Tromsø, N-9037 Tromsø, Norway, Fax: +47 77 64 62 80; e-mail: patrick@phys.uit.no. The plasma dispersion function and the reduced velocity distribution function are calculated numerically for any arbitrary velocity distribution function with cylindrical symmetry along the magnetic field. The electron velocity distribution is separated into two distributions representing the distribution of the ambient electrons and the suprathermal electrons. The velocity distribution function of the ambient electrons is modelled by a near-Maxwellian distribution function in presence of a temperature gradient and a potential electric field. The velocity distribution function of the suprathermal electrons is derived from a numerical model of the angular energy flux spectrum obtained by solving the transport equation of electrons. The numerical method used to calculate the plasma dispersion function and the reduced velocity distribution is described. The numerical code is used with simulated data to evaluate the Doppler frequency asymmetry between the up- and downshifted plasma lines of the incoherent-scatter plasma lines at different wave vectors. It is shown that the observed Doppler asymmetry is more dependent on deviation from the Maxwellian through the thermal part for high-frequency radars, while for low-frequency radars the Doppler asymmetry depends more on the presence of a suprathermal population. It is also seen that the full evaluation of the plasma dispersion function gives larger Doppler asymmetry than the heat flow approximation for Langmuir waves with phase velocity about three to six times the mean thermal velocity. For such waves the moment expansion of the dispersion function is not fully valid and the full calculation of the dispersion function is needed.

Key words. Non-Maxwellian electron velocity distribution · Incoherent scatter plasma lines · EISCAT · Dielectric response function


Summary
Electron velocity distribution function in a plasma with temperature gradient and in the presence of suprathermal electrons: application to incoherent-scatter plasma lines

 

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