Thermal fluctuations and the diffuse electrostatic emissions

Details Thermal fluctuations and the diffuse electrostatic emissions Thermal fluctuations and the diffuse electrostatic emissions

Mar 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87.1455s&link_type=abstract

Journal of Geophysical Research, vol. 87, Mar. 1, 1982, p. 1455-1472.

Physics

35

Electrostatics, Magnetospheric Instability, Plasma Radiation, Plasma Temperature, Space Plasmas, Cold Plasmas, Daytime, Dipole Antennas, Electron Plasma, High Temperature Plasmas, Satellite Observation

Scientific paper

The suggestion that the weak-banded electrostatic emissions observed in the magnetosphere at frequencies between the electron gyrofrequency and upper hybrid frequency are thermal fluctuations is quantitatively explored, by means of a hot-cold model for dayside electron distributions with density and temperature ratios much greater than unity. It is determined that, for typical dayside conditions, the observed waves are weakly damper Bernstein-Harris modes whose spectral density and polarization, perpendicular to the ambient magnetic field, can be accounted for by the theory. It is suggested that the formalism developed may be applicable to weak electron cyclotron emissions at Jupiter and Saturn, and can be extended to lower-frequency ion cyclotron fluctuations by modifying the theory to include ion contributions.

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