Physics
Scientific paper
Jan 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984georl..11...23a&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 11, Jan. 1984, p. 23-26.
Physics
28
Interplanetary Magnetic Fields, Ionospheric Currents, Magnetic Effects, Polar Caps, Vertical Air Currents, Magnetic Field Configurations, Magsat Satellites, Vertical Distribution
Scientific paper
Magnetic field data observed by MAGSAT at altitudes between 250-550 km clearly showed that a pair of vertical currents appears in the dayside polar cap when the interplanetary magnetic field (IMF) has a strong northward component. The currents were approximately symmetric with respect to the noon meridian, and flowed into the ionosphere on the duskside and away from it on the dawnside. These currents were very clearly seen on May 10, 1980, when the IMF was kept strongly northward all day long. The horizontal magnetic field along 10 successive orbits on the day indicated the signature. The distribution of the vertical magnetic field observed along the same orbits was reasonably explained in terms of the ionospheric Hall current which was produced when the vertical current flowed into or away from the ionosphere. The existence of such vertical currents was also confirmed by the statistical analysis over the whole MAGSAT data period.
Araki Takeo
Iyemori Toshihiko
Kamei Toyohisa
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