Physics
Scientific paper
Jan 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984p%26ss...32...97t&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 32, Jan. 1984, p. 97-104.
Physics
8
Auroral Zones, Earth Magnetosphere, Field Aligned Currents, Geomagnetism, Magnetopause, Polar Cusps, Birkeland Currents, Interplanetary Magnetic Fields, Kp Index, Particle Precipitation
Scientific paper
IMP and HEOS satellite magnetic data for 1966-1972 have been used to study the structure of the dayside magnetosphere, with attention to its Kp-, A(E)-, and IMF-dependence. An analysis is undertaken of the field line configurations on the basis of a least squares fitting of the model coefficients to the data subsets, and a detailed study of the model field distribution reveals a substantial difference in the polar cusp line field geometry between the cases of weak and strong geomagnetic activity. This is found to yield a longitudinal extension of the isointensity contours of particle precipitation at ionospheric heights during disturbed periods. In contrast, at quiet times, the precipitation isolines are much closer to circles. It is concluded that the cleft-like structure of polar cusps pertains only to active periods, and can be explained by a magnetic effect of enhanced Birkeland currents.
Tsyganenko Nikolai A.
Usmanov Arcadi V.
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