Physics
Scientific paper
Oct 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984georl..11.1086i&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 11, Oct. 1984, p. 1086-1089.
Physics
Auroral Arcs, Auroras, Interplanetary Magnetic Fields, Geomagnetism, Polar Caps, Satellite Observation
Scientific paper
Intense perturbations observed in the auroral oval by the DMSP satellite on Jan. 10, 1983 are analyzed for possible influences by the IMF. The oval shrank in the early afternoon and was accompanied by intense activity in the morning sector. The latter feature was rare and occurred during relative quiescence in the evening sector, which exhibited a smaller width than the morning sector. Simultaneously, the ISEE-3 and IMP-8 spacecraft recorded large negative By values and positive Bz values in the magnetotail, assumed to be caused by activity of the IMF. The asymmetry in the oval is attributed to the negative By component, which has previously been proven to shift the open region to the evening sector. The asymmetry appeared, however, only when the Bz component attained large positive values.
I-Akasofu S.
Tsurutani Bruce
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