0n the Geomagnetic Pulsation Pc （Part III） -Spectral and Polarization Characteristics of Middle- and Low-Latitude Pc3-
Kuwashima, M., Sano, Y. & Kawamura, M.
Continuous observations of geomagnetic pulsations with periods from 1 to 100 sec have been carried out by induction magnetometers at the middle- and low-latitude stations in Japan. Some spectral and polarization characteristics of pc 3 pulsations are mainly investigated by means of both analog- and digital-dynamic spectrum methods. In the present paper, solar-cycle variations and seasonal changes of occurrence frequency and mean period of pc 3 are shown with relation to solar and geomagnetic activities on a statistical basis. Particularly, latitudinal dependencies of both horizontal powers and polarizations of pc 3 are described in more detail as an extensive study in some special intervals.