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THE GEOMAGNETIC EFFECTS OF MAJOR FLARES IN THE SUNSPOT REGIONS OF MAGNETIC CLASSES γ AND β_γ

LIU CHUAN-SIN(Institute of Geophysics and Meteorology, Academia Sinica)  
The geomagnetic effects of solar flares of importance 3 and 3~+ in the sunspot regions of magnetic classes γ and β_γ during 1938—1958, are examined statistically according to the declination of the sun, the position angle of the sun's axis of rotation from the north point of the disk, and the heliographic coordinates of the flare. The results of correlation and regression analysis are drawn on the heliographic chart as isolines of geomagnetic disturbance. The data of the solar wind velocity, measured by the spectrometer on the spacecraft Mariner Ⅱ are made in correlation with the corresponding geomagnetic A_p index and they are in turn used with the isomagnetic chart mentioned above to estimate the distribution of the radial velocity of solar wind along the earth's orbit after the relevant eruptions. In addition, the A_p index following a flare thus far considered, can be estimated approximately by consulting the various curves given in the full text.
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