Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Modeling the UT effect in global distribution of ionospheric electric fields. / Lukianova, R.; Christiansen, F.
в: Journal of Atmospheric and Solar-Terrestrial Physics, Том 70, № 2-4, 01.02.2008, стр. 637-645.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Modeling the UT effect in global distribution of ionospheric electric fields
AU - Lukianova, R.
AU - Christiansen, F.
PY - 2008/2/1
Y1 - 2008/2/1
N2 - A new approach for modeling the global distribution of ionospheric electric potentials utilizing high-precision maps of field-aligned currents (FACs) derived from measurements by the Ørsted and Magsat satellites as input to a comprehensive numerical scheme is presented. We simulate the universal time (UT) effect in convection patterns caused by variation of solar luminosity and its effect on ionospheric conductivity. A rather complicated dependence of the convection patterns on the combination of UT and IMF clock angle is found. We consider different seasons and IMF conditions and find an increase of the daily variation in the cross-polar potential drop (UPC) at the equinoxes and a decrease at the solstices. Under equinoctial and zero IMF conditions the UPC can vary by a factor of two, while the convection cells keep their shape. The model predicts that the summer UPC can be smaller or larger than the winter UPC depending on the combination of UT and IMF clock angle. If a UT control of the FAC is introduced to the model, the UPC does not vary more than 10% over the course of the day.
AB - A new approach for modeling the global distribution of ionospheric electric potentials utilizing high-precision maps of field-aligned currents (FACs) derived from measurements by the Ørsted and Magsat satellites as input to a comprehensive numerical scheme is presented. We simulate the universal time (UT) effect in convection patterns caused by variation of solar luminosity and its effect on ionospheric conductivity. A rather complicated dependence of the convection patterns on the combination of UT and IMF clock angle is found. We consider different seasons and IMF conditions and find an increase of the daily variation in the cross-polar potential drop (UPC) at the equinoxes and a decrease at the solstices. Under equinoctial and zero IMF conditions the UPC can vary by a factor of two, while the convection cells keep their shape. The model predicts that the summer UPC can be smaller or larger than the winter UPC depending on the combination of UT and IMF clock angle. If a UT control of the FAC is introduced to the model, the UPC does not vary more than 10% over the course of the day.
KW - Conductance
KW - Convection
KW - Field-aligned currents
KW - Ionospheric electric field
UR - http://www.scopus.com/inward/record.url?scp=38949136980&partnerID=8YFLogxK
U2 - 10.1016/j.jastp.2007.08.047
DO - 10.1016/j.jastp.2007.08.047
M3 - Article
AN - SCOPUS:38949136980
VL - 70
SP - 637
EP - 645
JO - Journal of Atmospheric and Solar-Terrestrial Physics
JF - Journal of Atmospheric and Solar-Terrestrial Physics
SN - 1364-6826
IS - 2-4
ER -
ID: 36801587