Energy Release by Solar Flares: Observations at Radio and X-ray Wavelengths

摘要

This doctoral thesis presents observations and analysis of solar flares and thecorresponding active regions, recorded at radio and X-ray wavelengths during 1989-1993. The flare data are used both in a statistical sense and in analyzing individual flares. The radio data in microwaves/millimetre waves have been measured at the Metsahovi Radio Research Station, Finland, and consist of nearly 400 recorded solar events. Statistical analyses were done using the radio data and the simultaneously observed soft X-ray data, provided by the GOES satellites. Thermal bremsstrahlung fluxes were also calculated from the soft X-ray data, assuming the same emitting volumes in radio and soft X-rays. Some of the solar events recorded in radio and soft X-rays were also observed with BATSE and these events were analyzed in detail. The central meridian passage times of the active regions in the Metsahovi major flare data between 1989 and 1993 were studied with non-parametric methods to search for periodicity in a weighted time point series.