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

Martin Füllekrug, A I Sukhorukov

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

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 similar to 12 degrees, 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 similar to 11 degrees. 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 similar to +/-10 degrees which are related to the variability of anisotropic conductivity in the ionosphere on a subdiurnal time scale.
Original languageEnglish
Pages (from-to)1109-1112
Number of pages4
JournalGeophysical Research Letters
Volume26
Issue number8
Publication statusPublished - 1999

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lightning
ionospheres
flash
ionosphere
conductivity
deviation
diurnal variation
diurnal variations
Earth crust
Pacific Ocean
timescale
daytime
Germany
ocean
receivers
stations

Cite this

The contribution of anisotropic conductivity in the ionosphere to lightning flash bearing deviations in the ELF/ULF range. / Füllekrug, Martin; Sukhorukov, A I.

In: Geophysical Research Letters, Vol. 26, No. 8, 1999, p. 1109-1112.

Research output: Contribution to journalArticle

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AB - 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 similar to 12 degrees, 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 similar to 11 degrees. 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 similar to +/-10 degrees which are related to the variability of anisotropic conductivity in the ionosphere on a subdiurnal time scale.

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