Study of the geoelectric fields at Vostok, Antarctica ...
In fair weather regions, a downward directed geoelectric field of ~ 100 ‚ÄövÑvÆ 200 Vm-1 can be measured at the surface of the Earth. At high latitudes, the interaction of the solar wind and interplanetary magnetic field with the Earth's magnetosphere and ionosphere imposes a variable dawn-to-d...
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| Format: | Thesis |
| Language: | unknown |
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University Of Tasmania
2023
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| Online Access: | https://dx.doi.org/10.25959/23235338 https://figshare.utas.edu.au/articles/thesis/Study_of_the_geoelectric_fields_at_Vostok_Antarctica/23235338 |
| Summary: | In fair weather regions, a downward directed geoelectric field of ~ 100 ‚ÄövÑvÆ 200 Vm-1 can be measured at the surface of the Earth. At high latitudes, the interaction of the solar wind and interplanetary magnetic field with the Earth's magnetosphere and ionosphere imposes a variable dawn-to-dusk potential drop of 20 ‚ÄövÑvÆ 150 kV on the geoelectric field. Large scale horizontal electric fields in the ionosphere map into the vertical component of the near surface electric field. A total of 133 fair weather days of vertical geoelectric field data from Vostok, Antarctica (78.5¬¨‚àûS, 107¬¨‚àûE; corrected geomagnetic latitude, 83.5¬¨‚àûS), obtained during 1998, were selected to investigate the suitability of the Vostok site for studies of the global electric circuit and confirm the linkage between the solar wind imposed potential patterns and the near surface electric field. Seasonal variations in the diurnal electric field at Vostok are compared with the Carnegie diurnal curves, after appropriate allowance ... |
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