NDLI: Field-aligned currents in the winter and summer hemispheres caused by IMF By

Content Provider	Springer Nature Link
Author	Lukiava, R. Yu. Kozlovskii, A. Christiansen, F.
Copyright Year	2012
Abstract	Structures controlled by the IMF By sign and season of the year have been detected based on the decomposition of field-aligned current maps constructed using magnetic field measurements on polar low-orbiting satellites. It has been indicated that field-aligned currents have identical structures, composed of the main polar circular current and the return current at the polar cap dayside boundary, at any By sign in the summer hemisphere. Two different types of structures are implemented under winter conditions depending on the By sign. For the northern winter, it is the polar circular current and the return current at the polar cap nightside boundary at By < 0; current sheets are strongly stretched along latitudes below 80° MLat, and only small part of the current is in the noon sector of the polar cap. For the summer winter, the corresponding structures are implemented at opposite By signs. The intensities of the field-aligned currents, originating as a result of the interhemispheric asymmetry and flowing along closed geomagnetic field lines near the polar cap boundary, have been estimated. The maximum of the interhemispheric current density is 0.25 μA m$^{−2}$ in the summer and 0.1 μA m$^{−2}$ in the winter; the total current is 5 × 10$^{5}$ and 5 × 10$^{4}$ A, respectively.
Starting Page	300
Ending Page	308
Page Count	9
File Format	PDF
ISSN	00167932
Journal	Geomagnetism and Aeronomy
Volume Number	52
Issue Number	3
e-ISSN	1555645X
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2012-05-23
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Geophysics/Geodesy
Content Type	Text
Resource Type	Article
Subject	Geophysics Space and Planetary Science

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