The lightning HF radiation at 3 MHz during leader and return stroke processes

Details The lightning HF radiation at 3 MHz during leader and return stroke processes The lightning HF radiation at 3 MHz during leader and return stroke processes

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jatp...56..493j&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 56, no. 4, p. 493-501

Physics

3

Charge Transfer, Electric Fields, Lightning, Pulse Duration, Radiation Distribution, Atmospherics, High Frequencies, Sri Lanka, Temporal Distribution, Tropical Meteorology

Scientific paper

Simultaneous recordings of the broadband electric field and HF radiation at 3 MHz were obtained at times before and after the onset of first and subsequent lightning strokes. Data are presented for several hundred negative ground flashes observed in Sri Lanka within a range of 40 km over the land and sea. The stepped leader gave rise to strong 3 MHz radiation, but the peak amplitude of the radiation was less than that of the return stroke. In the return stroke phase, 3 MHz radiation was strongest at the beginning of the first return stroke and gradually decayed completely. The mean duration of the 3 MHz continua of 346 first strokes was 190 microseconds (S.D. = 69 microseconds). In about 99% of the cases 3 MHz radiation in the return stroke phase was accompanied by a burst of multitudinous, fine oscillatory pulses on the broadband electric field. Subsequent strokes, in general, had no 3 MHz radiation in their return stroke phases.

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