Other
Scientific paper
Oct 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20.2271o&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 20, p. 2271-2274
Other
15
Annual Variations, Earth Atmosphere, Geomagnetism, Interplanetary Magnetic Fields, Solar Wind, Sunspots, Fourier Analysis, Harmonic Functions, Histograms, Solar Activity Effects, Solar Cycles, Statistical Analysis
Scientific paper
The semiannual variation of the geomagnetic activity is investigated in connection with a large set of solar wind and interplanetary magnetic field data (4494 daily averages from 1965 to 1987). Our analysis confirms that the geomagnetic activity (described by the aa index), is mainly modulated by the southward component of the magnetic field (BS), as suggested by Russell and McPherron. On the other hand, it is also found that the solar wind velocity (V) has a relevant role in this phenomenon. In fact, the amplitude of the aa modulation is best correlated with the function BSV2. We also explore the linkage between the annual trend of aa and the sunspot activity (1868-1989), showing that the modulation of the geomagnetic activity follows a more regular pattern during the descending phase of the solar cycle than during the rising and maximum parts.
Moreno Giovani
Orlando M.
Parisi Mario
Storini Marisa
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