Dependence of Pc 3 magnetic energy spectra at South Pole on upstream solar wind parameters

Details Dependence of Pc 3 magnetic energy spectra at South Pole on upstream solar wind parameters Dependence of Pc 3 magnetic energy spectra at South Pole on upstream solar wind parameters

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....9212437y&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, Nov. 1, 1987, p. 12437-12442.

Physics

26

Antarctic Regions, Energy Spectra, Geomagnetic Micropulsations, Solar Wind, Angles (Geometry), Broadband, Interplanetary Magnetic Fields, Ion Beams, Narrowband, Solar Wind Velocity

Scientific paper

In order to clarify which of two principal postulated sources of broadband Pc 3 magnetic pulsations, i.e., upstream waves in earth's foreshock and surface waves on the dayside magnetospheric boundary, dominates at high latitudes near the cusp, the statistical relationships between solar wind parameters and narrow-band and broadband spectral powers in the Pc 3 frequency range (22-100 mHz) measured on the ground at the geographic south pole station were reexamined. Both the broadband (20-45 s) and narrow-band (20-30 s) magnetic powers measured at South Pole Station show good correlations with the hourly averaged solar wind speed but little (or no) correlations with the hourly averaged interplanetary magnetic field (IMF) cone angle or with the theoretically inferred reflected ion beam speed in the earth's foreshock.

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