Asymmetric structures of field-aligned currents and convection of ionospheric plasma controlled by the IMF azimuthal component and season of year |
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Authors: | R Yu Lukianova A Kozlovsky F Christiansen |
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Affiliation: | 1.Arctic and Antarctic Research Institute,Russian Academy of Sciences,St. Petersburg,Russia;2.Sodankyla Geophysical Observatory,Sodankyla,Finland;3.Danish National Space Center,Copenhagen,Denmark |
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Abstract: | We present the results of using the statistical model of field-aligned currents (FACs) based on satellite data and the numerical
model of the electric potential distribution in order to detect the asymmetric part in FAC structures and ionospheric plasma
convection controlled by the IMF azimuthal (B
y
) component at different seasons of the year. These structures can be identified by plotting diagrams, which represent differences
in corresponding maps for opposite signs of IMF B
y
. Circular near-pole current symmetric about the noon meridian and corresponding convection vortices around the pole have
been obtained for the summer and equinox periods. It is difficult to detect distinct structures under winter conditions, and
the current is most intense on the morning side. A two-cell convection system with the foci in the afternoon and postmid-night
sectors is created in the electric potential difference diagrams. Thus, qualitatively different FAC and convection patterns
exist during the solstice in opposite hemispheres. The value of the electric potential originating in the near-pole region
under the action of the B
y
component and a change in the potential under the action of additional factors have been estimated. |
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Keywords: | |
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