Morning polar substorms and variations in the atmospheric electric field |
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| Authors: | N G Kleimenova O V Kozyreva M Kubicki S Michnowski |
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| Institution: | 1.Institute of Physics of the Earth,Russian Academy of Sciences,Moscow,Russia;2.Institute of Geophysics,Polish Academy of Sciences,Warsaw,Poland |
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| Abstract: | 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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