An alternative explanation for the ultra-slow tail of sprite-associated lightning discharges

Details An alternative explanation for the ultra-slow tail of sprite-associated lightning discharges An alternative explanation for the ultra-slow tail of sprite-associated lightning discharges

Apr 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006jastp..68..814s&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 68, Issue 7, p. 814-820.

Physics

5

Scientific paper

Stimulated by experimental direct and indirect evidence of highly ionized plasma columns above sprite-associated lightning discharges in the upper mesosphere and lower ionosphere, respectively, a model is constructed by which secondary ULF transients in the magnetic field are explained in terms of magnetic signatures caused by induced currents flowing in the short-lived, highly ionized plasma columns. These signatures exhibit a quasi-periodic evaluation in time and exhibit time scales comparable with those reported for distant ULF transients connected with sprite-associated lightning discharges. In particular, the model allows an alternative explanation for the so-called ultra-slow tail which was taken as an indication for the excitation of the ionospheric Alfvén resonator above the sprite, an option for which some theoretical support exists in the literature. Virtues and drawbacks of both models are discussed.

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