The lower subsidiary diffuse plasma resonances and the classification of radio emissions below the plasma frequency

Journal Article · Fri Nov 01 04:00:00 EST 1991 · Journal of Geophysical Research; (United States)

DOI:https://doi.org/10.1029/91JA01961· OSTI ID:5812770

Osherovich, V A; Benson, R F ^[1]

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1. NASA Goddard Space Flight Center, Greenbelt, MD (United States)

The diffuse ionospheric resonances D{sub n}, stimulated by topside sounders, have been studied for over 2 decades. These resonances are observed below the plasma frequency f{sub N} between the harmonics of the electron gyrofrequency f{sub H}. The D{sub n} resonances are often accompanied by upper and lower subsidiary branches. The present paper concentrates on the classification of diffuse resonances, one motivation being the possible application to the interpretation of naturally occurring radio emissions in the magnetosphere. Osherovich has shown that the D{sub n} resonances are characterized by a nonequally spaced spectrum of frequencies f{sub D{sub n}} = f{sub Ds}n{sup 1/2} (n = 1, 2, 3, and 4), where f{sub D{sub s}} = 0.95(f{sub N}f{sub H}){sup 1/2}, and that the upper subsidiary resonances D{sub n}{sup +} = (f{sup 2}{sub D{sub n}} + f{sup 2}{sub H}){sup 1/2}. This classification is here extended to include the lower subsidiary resonances D{sub n}{sup minus} (n = 1, 2, 3, and 4), and it is shown that their frequencies are related to f{sub D{sub n}} and f{sub H} by the expression f{sub D{sub n}} = (f{sup 2}{sub D{sub n}} - f{sup 2}{sub H}){sup 1/2}. This result is based on a combination of previously published data and newly scaled ionograms from the Alouette 2 and ISIS 1 topside sounder experiments.

• OSTI ID: 5812770
• Journal Information: Journal of Geophysical Research; (United States), Journal Name: Journal of Geophysical Research; (United States) Vol. 96:A11; ISSN 0148-0227; ISSN JGREA
• Country of Publication: United States
• Language: English

Related Subjects

661320* -- Auroral
Ionospheric
& Magnetospheric Phenomena-- (1992-)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CLASSIFICATION
EARTH ATMOSPHERE
EARTH MAGNETOSPHERE
ELECTROMAGNETIC RADIATION
ELECTRON DENSITY
IONOSPHERE
LANGMUIR FREQUENCY
PLANETARY IONOSPHERES
PLASMA WAVES
RADIATIONS
RADIOWAVE RADIATION
RESONANCE
SATELLITES