Active region evolution in the build-up to large solar energetic particle events
Abstract
The SEP signatures of the solar flares occurring on 21 Apr 2002 and 24 Aug 2002 show marked differences in their compositions above 10 MeV/nucleon, yet at the Sun the events themselves display very similar characteristics in the chromospheric (hard X-ray) emission and their coronal (X-ray, EUV) signatures. We consider the prior evolution of the parent active regions to look for possible signatures in the ambient corona, magnetic connectivities (within the active region, large-scale closed field, and open field distributions), and flare/activity history which may differentiate the solar conditions leading to the observed disparate particle signatures at 1 AU.
- Publication:
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AGU Spring Meeting Abstracts
- Pub Date:
- May 2005
- Bibcode:
- 2005AGUSMSH53A..02A
- Keywords:
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- 7509 Corona;
- 7513 Coronal mass ejections;
- 7519 Flares;
- 7524 Magnetic fields