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Title: Terrestrial kilometric radiation. I. Spatial structure studies

Abstract

Observations of lunar occultations of the earth at 250 kHz, obtained with the Radio Astronomy Explorer 2 satellite, have been used to derive two-dimensional maps of the location of the sources of terrestrial kilometric radiation (TKR). By examining the two-dimensional source distributions as a function of the observer's location (lunar orbit) with respect to the magnetosphere, we can estimate the average three-dimensional location of the emission regions. Although TKR events at 250 kHz can often be observed at projected distances corresponding to the 250 kHz electron gyro or plasma level (R approx.=2 R/sub E/), many events are observed much farther from the earth (5 < or approx. = R < or approx. = 15 R/sub E/). On the dayside we observed emission apparently in the region of the polar cusp and the magnetosheath at ..lambda.. approx. 75/sup 0/, and in the night hemisphere we find emission associated with regions of the magnetotail at ..lambda.. > or greater than or equal to = 70/sup 0/. The nightside emission is suggestive of a mechanism involving plasma sheet electron precipitation in the premidnight sector. (AIP)

Authors:
;
Publication Date:
Research Org.:
Planetary Sciences Branch, Laboratory for Extraterrestrial Physics, Goddard Space Flight Center, Greenbelt, Maryland 20771
OSTI Identifier:
7336038
Resource Type:
Journal Article
Journal Name:
J. Geophys. Res.; (United States)
Additional Journal Information:
Journal Volume: 81:34
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; MAGNETOSPHERE; LONG WAVE RADIATION; COORDINATES; EARTH PLANET; ELECTRON PRECIPITATION; EXPLORER SATELLITES; KHZ RANGE 100-1000; MAGNETOPAUSE; PLASMA SHEET; SPATIAL DISTRIBUTION; THREE-DIMENSIONAL CALCULATIONS; CHARGED-PARTICLE PRECIPITATION; DISTRIBUTION; EARTH ATMOSPHERE; ELECTROMAGNETIC RADIATION; FREQUENCY RANGE; KHZ RANGE; PLANETS; RADIATIONS; RADIOWAVE RADIATION; SATELLITES; 640203* - Atmospheric Physics- Magnetospheric Phenomena- (-1987)

Citation Formats

Alexander, J K, and Kaiser, M L. Terrestrial kilometric radiation. I. Spatial structure studies. United States: N. p., 1976. Web. doi:10.1029/JA081i034p05948.
Alexander, J K, & Kaiser, M L. Terrestrial kilometric radiation. I. Spatial structure studies. United States. https://doi.org/10.1029/JA081i034p05948
Alexander, J K, and Kaiser, M L. 1976. "Terrestrial kilometric radiation. I. Spatial structure studies". United States. https://doi.org/10.1029/JA081i034p05948.
@article{osti_7336038,
title = {Terrestrial kilometric radiation. I. Spatial structure studies},
author = {Alexander, J K and Kaiser, M L},
abstractNote = {Observations of lunar occultations of the earth at 250 kHz, obtained with the Radio Astronomy Explorer 2 satellite, have been used to derive two-dimensional maps of the location of the sources of terrestrial kilometric radiation (TKR). By examining the two-dimensional source distributions as a function of the observer's location (lunar orbit) with respect to the magnetosphere, we can estimate the average three-dimensional location of the emission regions. Although TKR events at 250 kHz can often be observed at projected distances corresponding to the 250 kHz electron gyro or plasma level (R approx.=2 R/sub E/), many events are observed much farther from the earth (5 < or approx. = R < or approx. = 15 R/sub E/). On the dayside we observed emission apparently in the region of the polar cusp and the magnetosheath at ..lambda.. approx. 75/sup 0/, and in the night hemisphere we find emission associated with regions of the magnetotail at ..lambda.. > or greater than or equal to = 70/sup 0/. The nightside emission is suggestive of a mechanism involving plasma sheet electron precipitation in the premidnight sector. (AIP)},
doi = {10.1029/JA081i034p05948},
url = {https://www.osti.gov/biblio/7336038}, journal = {J. Geophys. Res.; (United States)},
number = ,
volume = 81:34,
place = {United States},
year = {Wed Dec 01 00:00:00 EST 1976},
month = {Wed Dec 01 00:00:00 EST 1976}
}