DocumentCode :
976227
Title :
Field-aligned currents and convection patterns in the southern polar cap during stable northward, southward, and azimuthal IMF
Author :
Papitashvilli, V.O. ; Belov, Boris A. ; Gromova, Ludmila I.
Author_Institution :
Inst. of Terrestrial Magnet., Ionosphere, & Radiowave Propagation, Troitsk, Moscow, USSR
Volume :
17
Issue :
2
fYear :
1989
fDate :
4/1/1989 12:00:00 AM
Firstpage :
167
Lastpage :
173
Abstract :
Equivalent ionospheric current patterns are derived from ground-based geomagnetic observations for events on 11-12 November 1979 (Bz≫0), 24 November 1981 (Bz≪0), 10-11 January 1980 (By ≫0) and 25-26 November 1979 (By ≪0), when the corresponding IMF (interplanetary magnetic field) conditions remained stable. The `radar scanning´ technique was used to scan the southern polar cap with a chain of unmanned magnetometer stations placed from the cap border to the corrected geomagnetic pole approximately along geomagnetic meridian 110°. During a stable southward IMF a result was obtained, a reversal of antisunward convection flow is identified, and an NBZ-like FAC (field-aligned current) system is restored in the central part of the southern polar cap. It is concluded that there may be an additional NBZ-like system poleward of -85°, which is independent of the IMF and is generated by the quasiviscous interaction between solar-wind plasma and high-latitude lobes of the magnetospheric tail
Keywords :
atmospheric electricity; geomagnetic variations; interplanetary magnetic fields; ionosphere; magnetosphere; AD 1979 11; AD 1980 01; atmosphere; convection patterns; field-aligned current; high-latitude lobes; interplanetary magnetic field; ionosphere; magnetospheric tail; radar scanning; solar-wind plasma; southern polar cap; Conductivity; Geomagnetism; Ionosphere; Magnetometers; Magnetosphere; Observatories; Plasmas; Satellites; Solar power generation; Tail;
fLanguage :
English
Journal_Title :
Plasma Science, IEEE Transactions on
Publisher :
ieee
ISSN :
0093-3813
Type :
jour
DOI :
10.1109/27.24621
Filename :
24621
Link To Document :
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