Logarithmic decay and Doppler shift of plasma associated with sprites

Details Logarithmic decay and Doppler shift of plasma associated with sprites Logarithmic decay and Doppler shift of plasma associated with sprites

May 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jastp..60..741d&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 60, Issue 7-9, p. 741-753.

Physics

11

Scientific paper

VLF phase and amplitude perturbations in `early/fast Trimpis' have been observed simultaneously on two or more transmitters at two or more receiver sites and simultaneously with sprites observed optically in Colorado. In all cases the early/fast Trimpis could apparently be resolved into two components: the RORD (rapid onset, rapid decay) component coincident with the sprite and a `classic Trimpi' component having the slower onset and decay of Trimpis generally thought to be caused by whistler-induced electron precipitation from the radiation belts. The phase and amplitude perturbations can decay at very different rates, and even change in sign from positive to negative perturbation (`overshoot') during decay. This implies a spatial separation between the rapid decay plasma responsible for the RORD and the slow decay plasma responsible for the classic Trimpi component of up to a few tens of km. This is much less than the expected separation of sprite plasma and electron precipitation plasma induced by the same cloud-ground lightning. The discovery of very strong early/fast Trimpis in the tropics (Darwin, Australia), where electron precipitation is unlikely, which showed similar effects like overshoot but much more clearly, caused an examination of recent Colorado data of high resolution. The Colorado Trimpis, which are clearly associated with sprites, show the same features as the Darwin Trimpis where optically detected sprites were not available. Both can be explained in terms of sprite plasma decaying from the bottom up without recourse to electron precipitation.

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