Physics
Scientific paper
Jul 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87.5207a&link_type=abstract
Journal of Geophysical Research, vol. 87, July 1, 1982, p. 5207-5216.
Physics
26
Elliptical Polarization, Geomagnetic Latitude, Statistical Analysis, Sudden Storm Commencements, Time Dependence, Data Reduction, Magnetohydrodynamic Waves, Magnetometers, Surface Waves, Wave Propagation
Scientific paper
Latitudinal variation of polarization of geomagnetic sudden commencements (sc) observed at geomagnetic latitude range 63 deg N to 79 deg N is studied by the use of North American IMS magnetometer data from August 1978 to May 1979. Fourteen sc's out of 18 examined show clear polarization reversal between latitudes 64 deg N and 72 deg N. Among these, nine change their polarization direction from counterclockwise to clockwise with increasing latitude and the remaining five change it in the opposite sense. Clear local time dependence as shown statistically by Wilson and Sugiura (1961) could not be confirmed from this small data set. Their statistical results (Wilson and Sugiura, 1963), however, can be more reasonably interpreted by taking into account the existence of latitudinal polarization reversal described in this paper.
Allen Joe H.
Araki Takeo
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