On the applicability of relativistic dispersion to auroral zone electron distributions

Details On the applicability of relativistic dispersion to auroral zone electron distributions On the applicability of relativistic dispersion to auroral zone electron distributions

Mar 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91.3152s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 91, March 1, 1986, p. 3152-3166.

Physics

28

Auroral Arcs, Electron Distribution, Space Plasmas, Cold Plasmas, Distribution Functions, Gyrofrequency, Kilometric Waves, Temperature Distribution, Wave Generation

Scientific paper

An examination is made to identify appropriate times to include weakly relativistic wave dispersion in calculations of auroral zone electron distributions. Two dispersion relations are examined. First, solutions are found for a ring distribution of particles around a cold ambient plasma. The solutions are found only for modes near the electron gyrofrequency. A trapped mode which is decoupled from the freely propagating R-X mode of cold plasmas is found to be the most unstable mode. Wave dispersion is examined with a spherically symmetric Dory-Guest-Harris (DGH) distribution, which describes a shell distribution that has a peak momentum larger than the thermal spread. The trapped mode is again found to be the most unstable. The analysis indicates it is beneficial to include relativistic effects whenever calculating auroral plasma distributions, and that a simple model will have sufficient accuracy.

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