On the sources of geomagnetic field Sq-variations at middle latitudes
© Sumaruk T.P., Sumaruk Yu.P.
Linear regression equations between amplitude of quiet solar-daily variations (Sq) at magnetic observatories "Lviv" and "Vojejkovo"(for 1952-1991) and solar activity expressed by Wolf number and MgII index which characteristics the intensity of ultraviolet radiation of the Sun are presented. Analysis of equations shows that Sq-variations consist of two parts: dependent and independent on solar activity. The first part is modulated by second one. The part Sq independent on Solar activity is variable only with seasons. Both of parts are distinguished.