Computer Science
Scientific paper
Jul 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010em%26p..106..119s&link_type=abstract
Earth, Moon, and Planets, Volume 106, Issue 2-4, pp. 119-132
Computer Science
Drifting Vlf Emissions, Whistler-Mode Waves, Geomagnetic Storm
Scientific paper
We have reported for the first time total seven strong events of drifting ELF/VLF discrete emissions observed on 28th-29th April, 1990 in the pre-midnight sector at Varanasi (Geomag. lat. 14°55'N, long. 154°E, L = 1.07). The events exhibit a regular increasing as well as decreasing frequency drifts and are mainly discrete periodic emissions of riser, faller and hook types observed during a geomagnetic storm period, with minimum Dst-index -98 nT and K p -index ≥ 5. The frequency drift in ELF/VLF emissions at low latitudes seems to be a rare phenomenon. The repetition period and the frequency drift rate have been evaluated for all the recorded events. The frequency drifts have been interpreted in terms of a combined effect of L-shell drift of interacting energetic electrons and the change in convection electric fields during the storm developments. The computed maximum spectral power density left< {Bf2 } rightrangle_{max } of the wave varies between 1.8 × 10-21 and 4.08 × 10-22 Gauss2/Hz, whereas frequency drift rates are in agreement with the observed values.
Singh Ambuj K.
Singh Ravi P.
Singh Shubha
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