Morning polar substorms and variations in the atmospheric electric field

Details Morning polar substorms and variations in the atmospheric electric field Morning polar substorms and variations in the atmospheric electric field

Feb 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010ge%26ae..50...48k&link_type=abstract

Geomagnetism and Aeronomy, Volume 50, Issue 1, pp.48-57

Computer Science

3

Scientific paper

The effects of morning magnetospheric substorms in the variations in near-Earth atmospheric electricity according to the observations of the electric field vertical component ( E z ), at Hornsund polar observatory (Spitsbergen). The E z, data, obtained under the conditions of fair weather (i.e., in the absence of a strong wind, precipitation, and fog), are analyzed. An analysis of the observations indicated that the development of a magnetospheric substorm in the Earth’s morning sector is as a rule accompanied by positive deviations in E z, independently of the Hornsund location: in the polar cap or at its boundary. In all considered events, Hornsund was located near the center of the morning convection vortex. In the evening sector, when Hornsund fell in the region of evening convection vortex, the development of a geomagnetic substorm was accompanied by negative deviations in E z., It has been concluded that the variations in the atmospheric electric field E z), at polar latitudes, observed during the development of magnetospheric substorms, result from the penetration of electric fields of polar ionospheric convection (which are intensified during a substorm) to the Earth’s surface.

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