Other
Scientific paper
Jul 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986p%26ss...34..639y&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 34, July 1986, p. 639-644.
Other
5
Asymmetry, Geomagnetism, Interplanetary Magnetic Fields, Magnetic Storms, Northern Hemisphere, Southern Hemisphere, Magnetic Effects, Magnetoactivity, Time Dependence
Scientific paper
Two of the eight activity indices, a1-a8, in the subauroral zones of the Northern and Southern Hemisphere are utilized to study the local time dependence of the N-S asymmetry of geomagnetic activity due to the By component of the IMF. It is observed that the magnitude of the N-S asymmetry of geomagnetic activity due to the IMF-By component is dependent on the magnetic local time and there are two types of dependence which relate to the level of substorm activity. The first type has a dawn-dusk asymmetry which is evident when the geomagnetic activity is low; the positive By varies the intensification of the southern and northern magnetic activity. The second type of dependence controls the majority of the N-S asymmetry geomagnetic activity; the magnitude of the effects of IMF-By increases with the level of substorm activity. This second type of dependence forms a double peak structure in magnitude along the magnetic local time; one peak at premidnight and the other in early morning.
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