Banded electrostatic emissions observed by the CRRES plasma wave experiment

Details Banded electrostatic emissions observed by the CRRES plasma wave experiment Banded electrostatic emissions observed by the CRRES plasma wave experiment

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....9713889p&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A9, Sept. 1, 1992, p. 13,889-13,898.

Physics

8

Electron Cyclotron Heating, Electrostatic Waves, Harmonic Radiation, Magnetospheric Electron Density, Plasma Frequencies, Diurnal Variations, Space Plasmas

Scientific paper

A survey of banded electrostatic emissions observed by the Plasma Wave Experiment on the recently launched spacecraft CRRES is presented with an emphasis on the relation of the frequency of the highest intensity waves to multiples of the local electron cyclotron frequency. Because one of its goals is a first look at the CRRES high-frequency electric field data, all the data discussed in this paper were taken in the first eight months after launch. During this time, emissions are detected chiefly in the postmidnight quadrant of the magnetosphere between L = 3.5 and L = 7. It is confirmed that high-intensity emissions are confined to within a few degrees of the magnetic equator. The emissions presented here are all measured below the electron plasma frequency, and it is found that they generally favor the upper part of the gyroharmonic interval. When ECH emissions are detected both near and far from the equator on the same orbit, it is generally true that a broad band of the same relative frequency emissions are excited in both locations. The difference is that, near the equator, a few frequency channels measure much higher intensities.

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