Comparison of Solar Activity During Last Two Minima on turn of Cycles Activity 22/23 and 23/24

Gryciuk Magdalena, mg@cbk.pan.wroc.pl, Space Research Centre, Polish Academy of Sciences, Poland
Gburek Szymon, sg@cbk.pan.wroc.pl, Space Research Centre, Polish Academy of Sciences
Siarkowski Marek, ms@cbk.pan.wroc.pl, Space Research Centre, Polish Academy of Sciences
Farnik Frantisek, Astronomical Institute of Academy of Sciences of the Czech Republic

Abstract
The subject of our work is review and comparison of solar activity during the last two solar minima that occurred between recent cycles. We use the soft X-ray solar corona observations for two nine-month long time intervals in 1997 and 2009. Data from RF15-I instrument are used for the penultimate minimum. The RF15-I was Czech-Polish-Russian photometer-imager for measuring of soft and hard solar X-rays (2-240 keV) emission. The instrument was launched in August 1995 onboard the INTERBALL-Tail satellite and operated till October 2000. For the last unusually deep and prolonged solar activity minimum in 2009 the data from SphinX are used. The SphinX was Polish X-ray spectrophotometer for measuring soft X-ray emission from the Sun in energy range between ~ 1 keV and 15 keV. SphinX operated from February to November 2009 on the CORONAS-Photon satellite. Comparison of measurements from both experiments takes place in the overlapping energy range 2 - 15 keV. In particular we focus on the Active Region formation, evolution and flaring productivity during investigated minimum cycle phases. Summary plots, obtained from reduced observations of both X-ray instruments for years 1997 and 2009 are to be presented. In the analysis we also use context white light observations and magnetograms in order to study and compare AR’s disk trajectories, longitudinal AR distribution on the solar disk and investigate underlying magnetic patterns.