X-class flares released during the decline phase of The SC- 24

Abstract:

During the decline phase of Solar Cycle 24(Sc-24), releases of X-class flare possessing high energetic particles. This flare event was more intense than that occurred during the main peak of this cycle. Additional eruptive X-class flares were later released during the year 2014and 2015.

The aim of this work is to forecast the release of eruptive events a few days before taking place, and to follow the changes of the active region recorded before, during, and after the production of X-class flares. The analysis is performed on the solar and geomagnetic data of the most eruptive events in 2014and 2015 during the double peak of solar cycle 24. The effects of the eruptive X -flares clearly appeared in the accumulation curve only on three parameters: X -ray Background Flux, Optical Flares intensity and X-ray Flares intensity. The changes started, at least, one day before the release of X-class flares.