Physics
Scientific paper
Mar 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.477...19s&link_type=abstract
In: Proceedings of the Second Solar Cycle and Space Weather Euroconference, 24 - 29 September 2001, Vico Equense, Italy. Editor:
Physics
Electron Acceleration, Coronal Mass Ejections
Scientific paper
The onset phase of transient solar phenomena at the time of fast (>800 km/sec) coronal mass ejections (CME) is poorly understood. In particular, the acceleration of energetic electrons and ions appears to take place in several stages. The first stage is at the onset of the CME, or the associated flare should that be present. This acceleration is to the full energy of the ions for that event, which for the largest events may exceed 10 GeV. The electrons are probably accelerated to similar velocities as the ions. Additional electrons, and those responsible for the hard X-ray burst if present, are most likely accelerated in the chromosphere. Fast CMEs are preceded by a shock, which is not normally very effective at particle acceleration out of the ambient coronal plasma. However, if there is a seed population present from the earlier phase, then substantial acceleration of electrons may occur, plus limited acceleration of ions, as the CME moves out through the high corona.
Haggerty Dennis K.
Roelof Edmond C.
Simnett George M.
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