Hiss-triggered chorus emissions at Indian stations

Details Hiss-triggered chorus emissions at Indian stations Hiss-triggered chorus emissions at Indian stations

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004jastp..66.1027s&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 66, Issue 12, p. 1027-1033.

Physics

4

Hiss, Triggered Chorus Emissions, Whistler Mode, Backward Wave Oscillator

Scientific paper

Some examples of chorus emissions emanating from the upper edge of the underlying hiss events recorded at the Indian Antarctic Station Maitri (geomag. lat.=62°S, long. 57.2° E, L=4.5) and low-latitude station Gulmarg (geomag. lat.=24°26'N, long. 147°09'E) are reported, in which intensity seems to decrease with increase in frequency and also it varies from event to event. It is proposed that resonance interaction of energetic electrons with wavelets present in the upper edge of hiss elements propagating in whistler mode under suitable condition behaves as a backward wave oscillator and generates chorus emissions. The minimum and the maximum value of interaction length, beam modulation period and temporal evolution of emitted wave frequency have been evaluated. Modulation period has been used to explain the periodicity in the recorded events and the temporal evolution of wave frequency has been used to explain the shape of dynamic spectrum of hiss-triggered emissions.

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