EMISSION OF SOLAR X-RAYS IN 0.5-3 A WAVELENGTH RANGE AND ITS RELATION TO MAGNETIC CONFIRURATION OF ACTIVE CENTERS

The slowly varying component of solar X-rays in the 0.5-3 Å wavelength range has been studied using data obtained by the satellite Explorer 30 (Solrad 8). The intensity of these X-rays is poorly correlated with the centimeter radio flux, contrary to the good correlation found in the spectral bands 1-8, 8-16 and 44-60 Å. On the other hand the 0.5-3 Å X-ray intensity is often connected to the development of a specific magnetic configuration in the sun spot group which may thus be associated with the X-ray producing active center. © 1969 D. Reidel Publishing Company.