Radiation near 2fp and intensified emissions near fp in the dayside and nightside auroral region and polar cap

Iver Cairns; J Menietti

doi:10.1029/96JA03559

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Radiation near 2fp and intensified emissions near fp in the dayside and nightside auroral region and polar cap

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Radiation near 2fp and intensified emissions near fp in the dayside and nightside auroral region and polar cap

Iver Cairns and J Menietti

Journal of Geophysical Research, Vol.102(A3), pp.4787-4798

03/01/1997

DOI: 10.1029/96JA03559

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Abstract

This paper reports the discovery in the DE 1 data of propagating radiation near 2fp (the H component) and relatively intense EM waves near fp with fields typically below 1 mV/m (the PF or plasma frequency component) on both the dayside and the nightside of Earth. These emissions are observed at auroral and polar cap latitudes for radial distances ranging from 2.5 to 4.5 Earth radii. The H component is unique in that no other 2fp emissions are known to be generated where the electron gyrofrequency fg exceeds 2fp. Grounds for interpreting the H component as emissions generated near 2fp are provided by the very good frequency tracking of the PF and H components and typical frequency ratios near 2.0. Strong evidence exists that part of the H component is propagating EM radiation, based on propagation effects and spin modulation patterns. However, no magnetic signals have yet been detected for the H component, so that it could be partly electrostatic. Cold plasma theory and the observed wave characteristics favor interpreting the H component as composed of o mode and/or z mode signals. Combining the DE I observations with rocket observations, it is predicted that the much more intense Langmuir-like fields observed in the low altitude auroral zones should also generate observable 2fp radiation. (Author)

Details

Title: Subtitle: Radiation near 2fp and intensified emissions near fp in the dayside and nightside auroral region and polar cap
Creators: Iver Cairns
J Menietti
Resource Type: Journal article
Publication Details: Journal of Geophysical Research, Vol.102(A3), pp.4787-4798
DOI: 10.1029/96JA03559
ISSN: 0148-0227
eISSN: 2156-2202
Language: English
Date published: 03/01/1997
Academic Unit: Physics and Astronomy
Record Identifier: 9984627205902771

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