Correlation Study on Day-to-day Changes of Geomagnetic Solar Daily Variation and Parameters of IMF Sector Structure and Others
Shiraki, M.
Abstract
The correlations between day-to-day changes of focus latitude φf and intensity rD of the equivalent current system of geomagnetic solar daily variation and parameters of solar activity and ionosphere were examined. Though the correlations are not so high, φf is correlated to the interplanetary magnetic field (IMF) sector structure and the critical frequency of F2 layer (foF2), φｆ shifts polewards (equatorwards) with the IMF away (toward) sector structure，and shifts polewards with decrease of foF2 in summer and with increase of foF2 in winter.
The resemblance of dynamic power spectrum structure of φf to those of IMF sector structure and foF2 may support the fact of the correlations.
