THE CORRELATION OF SOLAR MICROWAVE AND SOFT X-RAY RADIATION. 1. THE SOLAR CYCLE AND SLOWLY VARYING COMPONENTS.
IOWA UNIV IOWA CITY DEPT OF PHYSICS AND ASTRONOMY
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The integral solar x-ray flux between 2-12 A was measured by the spacecrafts Injun 1, Injun 3, Explorer 33, and Explorer 35. The integral flux between 2-9 A was observed by the Mariner V spacecraft. The data from Injuns 1 and 3 and Explorers 33 and 35, when averaged in monthly intervals, show a long term variation in activity of at least a factor of five between 1961 and 1969. A slowly varying component which tracks the 10 cm radio flux is observed in the x-ray flux. This x-ray flux variation, about a factor of ten, correlates with the appearance of major active regions on the solar disc. This slowly varying component correlates well with radio fluxes at frequencies greater than about 1 GHz and less well with radio fluxes at lower frequencies. The x-ray spectrum, obtained by comparing the 2-9 A flux with the 2-12 A flux, hardens during periods of high solar activity and may harden during flares, but does not soften. Author