Physics
Scientific paper
Jun 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aipc..471..685k&link_type=abstract
The solar wind nine conference. AIP Conference Proceedings, Volume 471, pp. 685-688 (1999).
Physics
3
Particle Acceleration, Solar Physics
Scientific paper
We suggest a possible technique for remotely observing the acceleration of solar energetic ions to E>1 MeV at coronal shock fronts. It involves the observation of the wings of line emission from ions accelerated in shocks, which could be done with the UVCS experiment on the SOHO spacecraft. UVCS has two UV channels producing stigmatic spectra from 42 arc min slits that can observe the Lyα and O VI lines, both of which could be broadened with the passage of a shock. In that case, the Lyα line formation results from proton charge exchange and collisional excitation of hydrogen atoms, while the broadened O VI lines are due to directly accelerated O5+ ions. The search criterion for candidate SOHO events consists of UVCS observations of coronal regions flanking or ahead of fast (v>400 km/s) white light CMEs observed with the LASCO coronagraph.
Kahler Stephen W.
Laming Martin J.
Raymond John C.
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