A Search for Solar Energetic Particel Events with Radio-Silent Coronal Mass Ejections

Details A Search for Solar Energetic Particel Events with Radio-Silent Coronal Mass Ejections A Search for Solar Energetic Particel Events with Radio-Silent Coronal Mass Ejections

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsh13a1139k&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SH13A-1139

Other

7513 Coronal Mass Ejections, 7514 Energetic Particles (2114), 7519 Flares, 7534 Radio Emissions

Scientific paper

Shock waves are well-known accelerators of energetic particles in the interplanetary space. It is widely believed that the shock waves presumably driven by fast coronal mass ejections (CMEs) are the main accelerators of large solar energetic particle events. But the ability of shock waves to accelerate ions and electrons rapidly to high energies is still subject to debate. On the observational side, the large solar energetic particle events are associated with fast CMEs, but also with flares, i.e with particle acceleration in and around active regions. Statistical association hence does not allow us to constrain the accelerator. Using COSTEP and LASCO on SoHO, we look for particle signatures (deka-MeV protons and electrons above 100 keV) in carefully selected CMEs which are fast, but not accompanied by radio emission revealing electron acceleration in the low or middle corona, and where EUV and optical images show that activity occurs on the disk. Only three events were found between 1996 and 1998. In one of them weak particle signatures are detected by COSTEP, but not in the two others. We discuss the relevance of this observation to the origin of solar energetic particle events.

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