Correlation of Solar Practice Events with Geomagnetic Storms.

Solar particle events recorded by the DMSPF7 Space Radiation Dosimeter and the IMP-8 Charged Particle Telescope have been studied. Some of the events were followed by geomagnetic storms while others were not. A detailed study of the particle components of these events was conducted in order to isolate differences in them that might be indicators of geomagnetic activity that follows some of the events. The advantage of finding such predictors is that the particle event precedes the magnetic activity by 1-2 days and would lead to an early warning for the impending storm. We found that events that were followed by magnetic storms had the following features that were different from events that were not followed by storms 1 A softer spectrum in the protons 2 A slower rise of proton component from background to peak 3 More high energy electrons above 1 MeV than high energy protons above 20 MeV. The first feature was verified in a sample of 11 solar particle events while 2 and 3 were confirmed using a sample of 5 events.