Physics
Scientific paper
Jun 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998georl..25.2065s&link_type=abstract
Geophysical Research Letters, Volume 25, Issue 12, p. 2065-2068
Physics
76
Magnetospheric Physics: Auroral Phenomena, Magnetospheric Physics: Plasma Waves And Instabilities, Ionosphere: Plasma Waves And Instabilities, Ionosphere: Auroral Ionosphere
Scientific paper
The Fast Auroral SnapshoT (FAST) explorer frequently observes the auroral density cavity, which is the source region for Auroral Kilometric Radiation (AKR). An important factor in the generation of AKR is the relative abundance of hot and cold electrons within the cavity, since hot electrons introduce relativistic modifications to the wave dispersion. VLF wave-form data acquired by FAST within the auroral density cavity show clear signatures of whistler-mode waves propagating on the resonance cone. This allows us to obtain the electron plasma frequency, and the cavity often has densities <1 cm-3. Moreover, the hot electrons can be the dominant electron species, enabling AKR to be generated below the cold electron gyro-frequency.
Carlson Carl W.
Cattell Cynthia A.
Chaston Christopher. C.
Delory Gregory T.
Elphic Richard C.
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