Solar flare and geomagnetic activity relations

Özet

Two x-ray solar flare parameters (number of flares and peak flux) are compared to geomagnetic and spaceweather activity indices. The first solar flare parameter, X-ray solar flare number (SFN), is the total number of solarflares observed in a given month. The second one is the monthly maximum of X-ray solar flare peak fluxes (SFP).In order to compare these two parameters, both of them are cross-correlated with some other indices of geomagneticactivity (aa, Dst, and AE indices) and space weather (maximum coronal mass ejection speed index and solar wind speed).Maximum correlation was found (∼0.63) between both flare time series (SFN and SFP) and maximum coronal massejection speed index with no lag. Our results show that X-ray solar flare peak flux better describes those geomagneticand space weather activity indices than X-ray solar flare numbers. This is mostly because of high time delays betweenflare numbers and studied indices.