Highlights Finding solar release times of SEP events using velocity dispersion analysis. For low CME speeds, difference between SEP and CME origin times is larger. Proton peak flux - SF peak flux correlation falls with rise in particle energy.
Abstract Properties and association of Solar Energetic Particle (SEP) events with their solar sources during the 24th solar cycle were examined. SEPs observed by SOHO ERNE were used. SEP properties include solar release time, peak proton flux and total fluence in different energy channels. Solar release times of SEP events were found out using Velocity Dispersion Analysis (VDA). It is observed that for low Coronal Mass Ejection (CME) velocities, the difference between SEP and CME release times is larger compared to that for high velocities. For SEPs associated with C class Solar Flares (SF), the average time difference in the release times is around 78 min, whereas in M and X class flares the time differences are 38 and 31 min respectively. Correlation analysis of proton peak flux with the CME speed and SF peak flux reveals that the coefficients decrease with increase in particle energy in both the cases. The correlation coefficient between total proton fluence of SEP and the peak flux of SF is moderate and decrease with increase in energy and tends to increase beyond 60 MeV. The correlation between total proton fluence and CME speed is high and it increases initially and then decrease with increase in energy. The analysis of H/He ratio of SEP events shows that the average value of the ratio extends from 16 to 837.
A study of the characteristic properties of SEP events observed by SOHO ERNE during solar cycle 24
Advances in Space Research ; 69 , 7 ; 2902-2920
2022-01-21
19 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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