Observation of topside ionospheric MF/HF radio emission from space

Details Observation of topside ionospheric MF/HF radio emission from space Observation of topside ionospheric MF/HF radio emission from space

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26..667b&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 6, p. 667-670

Physics

Plasma Physics

6

Ionosphere: Plasma Waves And Instabilities, Radio Science: Ionospheric Propagation, Space Plasma Physics: Radiation Processes

Scientific paper

We present observations of MF/HF ionospheric radio emission observed between 4-7Re 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~1.8MHz, and a more steady and weaker emission near f~4.4MHz. 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.

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