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Ann. Geophys., 22, 2067-2072, 2004
www.ann-geophys.net/22/2067/2004/
© European Geosciences Union 2004
Generation mechanism for VLF chorus emissions observed at a low-latitude ground station
A. K. Singh and K. Rönnmark
Department of Theoretical Space Physics, Umeå University, Umeå, SE-90187, Sweden
Abstract. A detailed spectral analysis of VLF chorus emissions
observed at the low-latitude ground station Gulmarg (geomag. lat., 24°
26' N, geomag. long., 147° 9' E, L=1.28) during the strong
magnetic activity on 7-8 March 1986 have been carried out, which shows that
each chorus element originates from the upper edge of the underlying hiss
band. To explain various temporal and spectral features of these emissions,
a possible generation mechanism has been presented based on the backward
wave oscillator regime of the magnetospheric cyclotron maser. On the basis
of this model, we have computed various chorus parameters as well as some
magnetospheric parameters affecting the generation process. A comparison of
the observed chorus characteristics with the proposed generation mechanism
shows a good agreement.
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