Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.3585r&link_type=abstract
Geophysical Research Letters, Volume 26, Issue 24, p. 3585-3588
Astronomy and Astrophysics
Astrophysics
31
Interplanetary Physics: Energetic Particles, Heliospheric, Solar Physics, Astrophysics, And Astronomy: Energetic Particles
Scientific paper
We examine the range of possible energy dependence of the ionization states of ions that are shock-accelerated from the ambient plasma of the solar corona. If acceleration begins in a region of moderate density, sufficiently low in the corona, ions above ~0.1 MeV/amu approach an equilibrium charge state that depends primarily upon their speed and only weakly on the plasma temperature. We suggest that the large variations of the charge states with energy for ions such as Si and Fe observed in the 1997 November 6 event are consistent with stripping in moderately dense coronal plasma during shock acceleration. In the large solar-particle events studied previously, acceleration occurs sufficiently high in the corona that even Fe ions up to 600 MeV/amu are not stripped of electrons.
Ng Chee K.
Reames Donald. V.
Tylka Allan J.
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