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Observation of Topside Ionospheric MF/HF Radio Emission from Space
Author(s) -
Bale S. D.
Publication year - 1999
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/1999gl900048
Subject(s) - ionosphere , magnetosphere , spacecraft , physics , high frequency , geophysics , radio spectrum , space weather , radio wave , atmospheric sciences , plasma , astronomy , quantum mechanics
We present observations of MF/HF ionospheric radio emission observed between 4–7 R e 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 f uh ≈ nf ce is met. These observations represent a new component of the natural terrestrial radio spectrum as viewed from space.

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