Soft x-ray solar activity and its correlation with cosmic ray and earth'S magnetic field variations during 22nd and 23rd solar cycles

The method has been developed for integrating numerous one-type series of measurements separated in time into the unified weight-average series defined at the interval enclosing all initial measurements. Diurnal averaged series was synthesized on the basis of this method using data of GOES satellites; the series comprises the flux of soft solar X-ray and the value of a terrestrial magnetic field during 22nd and 23rd solar activity cycles. The X-ray flux series was divided into «flare» and «background» components. The diurnal averaged series of the cosmic ray flux was also synthesized by the similar method from measurements of neutron monitors scattered over the Earth's surface. The construction of the complex spectral periodogram allowed us to reveal the hidden quasi-periodicities with periods from several days to one year for each of solar cycles in the above weight-average data series. The revealed periodicities show up the mean lifetime of solar activity features as well as differential rotation of the solar atmosphere. The functions of cross-correlation of flare and background components of the soft X-ray flux with the cosmic ray and Earth's magnetic field variations were also considered.