Heating and ionization of the lower ionosphere by lightning

Details Heating and ionization of the lower ionosphere by lightning Heating and ionization of the lower ionosphere by lightning

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18..705i&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 18, April 1991, p. 705-708.

Physics

83

Electromagnetic Pulses, Electromagnetic Radiation, Electron Energy, Ionospheric Heating, Ionospheric Ion Density, Lightning, Atmospheric Electricity, Perturbation Theory, Pulse Duration, Very Low Frequencies

Scientific paper

Nighttime ionospheric electrons at 90-95 km altitude are found to be heated by a factor of 100-500 during the upward passage of short (less than 100 microsec) pulses of intense (5-20 V/m at 100 km distance) electromagnetic radiation from lightning. Heated electrons with average energy of 4-20 eV in turn produce secondary ionization, of up to 400/cu cm at about 95 km altitude in a single ionization cycle (about 3 microsec). With the time constant of heating being 5-10 microsec, a number of such ionization cycles can occur during a 50 microsec radiation pulse, leading to even higher density enhancements. This effect can account for previously reported observations of 'early' or 'fast' subionospheric VLF perturbations.

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