Solar are and geomagnetic activity relations

Authors : Volkan SARP, Ali KILCIK

Pages : 283-292

View : 18 | Download : 7

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :  Two x-ray solar flare parameters insert ignore into journalissuearticles values(number of flares and peak flux); are compared to geomagnetic and space weather activity indices. The first solar flare parameter, X-ray solar flare number insert ignore into journalissuearticles values(SFN);, is the total number of solar flares observed in a given month. The second one is the monthly maximum of X-ray solar flare peak fluxes insert ignore into journalissuearticles values(SFP);. In order to compare these two parameters, both of them are cross-correlated with some other indices of geomagnetic activity insert ignore into journalissuearticles values(aa, Dst, and AE indices); and space weather insert ignore into journalissuearticles values(maximum coronal mass ejection speed index and solar wind speed);. Maximum correlation was found insert ignore into journalissuearticles values( ∼ ` role=`presentation`> ∼ ∼ \sim 0.63); between both flare time series insert ignore into journalissuearticles values(SFN and SFP); and maximum coronal mass ejection speed index with no lag. Our results show that X-ray solar flare peak flux better describes those geomagnetic and space weather activity indices than X-ray solar flare numbers. This is mostly because of high time delays between flare numbers and studied indices.
Keywords : Solar ares, coronal mass ejections, geomagnetic indices, solar wind, cross correlation