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Bale 1999
Bale, S.D. (1999). Observation of Topside Ionospheric MF/HF Radio Emission from Space. Geophysical Research Letters 26: doi: 10.1029/1999GL900048. issn: 0094-8276.

We present observations of MF/HF ionospheric radio emission observed between 4--7 Re in the terrestrial magnetosphere by the Wind spacecraft. During a perigee pass, and AKR episode, two distinct radio signatures are observed: an intense, sporadic emission near f≈1.8 MHz, and a more steady and weaker emission near f≈4.4 MHz. These emissions show characteristics similar to ground observations of ionospheric 'auroral roar', although to propagate to the spacecraft they must have been generated above the ionospheric F-layer peak. We suggest that the emissions are generated on the topside ionosphere where the condition fuh≈nfce is met. These observations represent a new component of the natural terrestrial radio spectrum as viewed from space. ¿ 1999 American Geophysical Union

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Abstract

Keywords
Ionosphere, Plasma waves and instabilities, Space Plasma Physics, Radiation processes
Journal
Geophysical Research Letters
http://www.agu.org/journals/gl/
Publisher
American Geophysical Union
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