Physics
Scientific paper
Oct 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jgr...10019565o&link_type=abstract
Journal of Geophysical Research, Volume 100, Issue A10, p. 19565-19570
Physics
11
Interplanetary Physics: Interplanetary Magnetic Fields, Interplanetary Physics: Solar Wind Plasma, Magnetospheric Physics: Solar Wind/Magnetosphere Interactions
Scientific paper
The diurnal (universal time) modulation of the geomagnetic activity is investigated, using the am index along with interplanetary plasma and magnetic field data collected by a variety of spacecraft from 1965 to 1987. A direct comparison with satellite measurements of the Bs component of the interplanetary magnetic field (IMF) is made. Our results confirm the Russell-McPherron (R-M) model, which attributes the above phenomenon to the varying southward component (Bs) of the IMF in the geocentric solar magnetospheric system. Moreover, we compared the contributions of the equinoctial and R-M mechanisms to the observed am modulation, showing that the latter effect is dominant. .
Moreno Giovani
Orlando M.
Parisi Mario
Storini Marisa
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