The contribution of anisotropic conductivity in the ionosphere to lightning flash bearing deviations in the ELF/ULF range

Details The contribution of anisotropic conductivity in the ionosphere to lightning flash bearing deviations in the ELF/ULF range The contribution of anisotropic conductivity in the ionosphere to lightning flash bearing deviations in the ELF/ULF range

Apr 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.1109f&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 8, p. 1109-1112

Physics

7

Atmospheric Composition And Structure: Middle Atmosphere-Energy Deposition, Geomagnetism And Paleomagnetism: Rapid Time Variations, Ionosphere: Ionosphere/Magnetosphere Interactions, Meteorology And Atmospheric Dynamics: Lightning

Scientific paper

Lightning flash bearing deviations in the ELF/ULF range are monitored at two independently operating measurement instruments in Hollister, California, and Silberborn, Germany. The lightning flash bearing deviation at Hollister exhibits a rotational dependence ~12°, associated with the conductivity contrast between the Earth's crust and the nearby Pacific Ocean. The bearing deviations at both stations exhibit a pronounced diurnal local time variation ~11°. This diurnal variation is attributed to the anisotropic conductivity in the ionosphere during day- and nighttime conditions. No bearing deviation dependency from the source-receiver distance can be distinguished. Correction for the mean rotational dependence at Hollister and the mean diurnal variation at both locations results in residual bearing deviations ~+/-10° which are related to the variability of anisotropic conductivity in the ionosphere on a subdiurnal time scale.

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