Mathematics – Logic
Scientific paper
Jul 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989p%26ss...37..767v&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 37, July 1989, p. 767-773. Research supported by MPI and CNR.
Mathematics
Logic
22
Bow Waves, Geomagnetic Micropulsations, Power Spectra, Solar Wind, Tropical Regions, Earth Magnetosphere, Frequency Ranges, Resonance Lines, Statistical Analysis
Scientific paper
Geomagnetic field fluctuations detected at L'Aquila during 1985 have been investigated on a statistical basis in the range of frequencies 7.8-234 mHz (Pc2, Pc3 and Pc4). The most significant events have been selected by means of a comparison between dynamic power spectra and the background spectrum. Dayside events, which perturb mainly the N-S component, tend to occur in two separate ranges, namely P(1) = 25 + or - 5 s, and P(2) = 13 + or - 2 s. The morphological differences between these groups of oscillations appear consistent with a wide source spectrum peaked at P(1) (possibly upstream waves generated in the solar wind foreshock region) and a resonant mechanism at P(2) which might correspond to the fundamental eigenperiod of the local field-line. Nighttime events show all the characteristics of Pi2 pulsations and no evidence for field-line resonance phenomena is supported by the experimental observations.
Cerulli-Irelli P.
de Lauretis Marcello
Vellante Massimo
Villante Umberto
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