Fine structure in electrostatic emission bands between electron gyrofrequency harmonics

Details Fine structure in electrostatic emission bands between electron gyrofrequency harmonics Fine structure in electrostatic emission bands between electron gyrofrequency harmonics

May 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89.3015k&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 89, May 1, 1984, p. 3015-3018.

Physics

13

Earth Magnetosphere, Electrostatic Waves, Fine Structure, Gyrofrequency, Harmonics, Cyclotron Frequency, Distribution Functions, Electron Distribution, Pitch (Inclination), Scatha Satellite, Spectral Bands

Scientific paper

In the 1.5 years of broadband VLF data available from the receiver aboard the SCATHA satellite, the majority of observations of electrostatic emissions show fine structure. This fine structure consists of several distinct emission bands between electron gyrofrequency harmonics. Typically, three fine structure bands comprise one emission band. Most of the SCATHA observations include only the passband between f(c) and 2f(c). However, a few observations obtained in regions of lower geomagnetic field intensity show similar fine structure in emission bands up to the passband between 3f(c) and 4f(c). This short note reports the observation of fine structure in electron cyclotron harmonic waves and the corresponding in situ electron distribution functions. A significant number of these observations (about 70 percent) occurred at times when the electron pitch angle distribution had a pronounced minimum at 90 deg in one or more energy channels in the 1- to 10-keV range.

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