Physics
Scientific paper
Nov 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89.9720t&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 89, Nov. 1, 1984, p. 9720-9730.
Physics
20
Geomagnetic Micropulsations, Magnetic Signatures, Power Spectra, Spectral Bands, Spectrum Analysis, Auroral Zones, Temporal Distribution
Scientific paper
The relationships among Pc 3, Pc 4, and Pc 5 activities observed at ground stations near L = 6 are clarified by comparing their dynamic spectral structures. It is found that there are two predominant spectral bands throughout the daytime with frequencies of about 20-80 mHz and about 3-10 mHz. At synchronous orbit, corresponding spectral bands are seen in the frequency-time spectra of the azimuthal component which generally show a clear harmonic structure when the satellite is located at the off-magnetic equator. The result strongly suggests that the 20-80 mHz band is the higher harmonics of standing shear Alfven waves and the 3-10 mHz band is the fundamental mode. Switching of activity between both bands is frequently observed on magnetically quiet days, indicating that the Pc 3 and Pc 4/5 bands are excited by different external driving sources.
Fukunishi Hiroshi
Hirasawa Takeo
Kato Yusuke
McPherron Robert L.
Sakurai Takashi
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