Are type III radio aurorae directly excited by electrostatic ion cyclotron waves?

Details Are type III radio aurorae directly excited by electrostatic ion cyclotron waves? Are type III radio aurorae directly excited by electrostatic ion cyclotron waves?

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....9413479w&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, Oct. 1, 1989, p. 13479-13488.

Physics

8

E Region, Electrostatic Waves, Ion Cyclotron Radiation, Radar Measurement, Radio Auroras, Type 3 Bursts, Backscattering, Multipath Transmission, Radar Scattering, Statistical Analysis

Scientific paper

The view that a significant number of type III spectra (narrow spectra with sub ion-acoustic Doppler shifts) are due to directly excited electrostatic ion cyclotron (EIC) waves was examined using radar backscatter observations from a network of three 50-MHz radar transmitters and two receivers operated in 1981 on the Canadian prairies. Based on a statistical analysis of data, it is shown that the type III spectra observed do not support an interpretation within the framework of EIC waves. It was found that spectral width of the type III echoes decreases linearly with magnetic aspect, by about 2 Hz/deg.

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