Origin of ELF/ULF waves triggered by positive cloud to ground lightning above mesoscale connective systems

Details Origin of ELF/ULF waves triggered by positive cloud to ground lightning above mesoscale connective systems Origin of ELF/ULF waves triggered by positive cloud to ground lightning above mesoscale connective systems

Jun 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3112110s&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 12, CiteID L12110

Physics

Electromagnetics: Plasmas, Ionosphere: Plasma Waves And Instabilities, Ionosphere: Wave Propagation (6934), Meteorology And Atmospheric Dynamics: Atmospheric Electricity, Meteorology And Atmospheric Dynamics: Lightning

Scientific paper

Powerful electric currents and transient luminous events (sprites, blue jets and gigantic jets) have been detected in discharges between thunderclouds and the lower Ionosphere. The occurrence of such phenomena is strongly related to the occurrence of Ultra Low Frequency (ULF ~ 6-50 Hz) waves and to the occurrence of positive polarity cloud-to-ground flashes. In the present letter, we present a novel mechanism to explain the origin and propagation of the observed ULF waves. Ionospheric clouds are composed of charged ice/smoke particulates, protons, electrons and neutrals. Our objective here is to show that such partially ionized dusty plasmas with streaming electrons in ionospheric clouds may support unstable ULF dust acoustic waves (DAWs). For our purposes, we employ a multifluid dusty plasma model and derive the dispersion relation for modified DAWs in a magnetized collisional plasma. The dispersion relation is analyzed numerically to obtain the growth rate and threshold.

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