An investigation of radio-frequency radiation from the sun.

摘要: It has been known for some time that the sun emits radio-frequency radiation whose intensity greatly exceeds value expected from a black-body at 6000 degrees K. In present paper, experiments are described in which measurements have made of solar frequencies 175 and 80 Mcyc./sec. Measurement small powers can be abstracted practical aerial systems requires special types receiving equipment if absolute to recorded automatically over long periods time. An apparatus developed output power local source random 'noise' is continuously adjusted so as equal power; this way receiver used only an indicator balance, errors due variation its gain or internal noise eliminated. A type devised enables separately galactic radiation, continuous observation with aerials comparatively low directivity. The results obtained on these two show normally corresponds surface temperature order 10$^{6}$ Large fluctuations occur, however, during passage large sunspots, equivalent temperatures high 10$^{8}$ 10$^{9}$ K observed. addition day-to-day variations subject sudden brief increases lasting few seconds. Measurements diameter source, by method analogous Michelson's stellar interferometer, shown very great originates area same size sunspot. This result means 10$^{10}$ must exist. polarization increased activity mainly circularly polarized. account covers experimental methods up hoped consider theoretically future paper.