Other
Scientific paper
Jan 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006adspr..38..493k&link_type=abstract
Advances in Space Research, Volume 38, Issue 3, p. 493-497.
Other
12
Scientific paper
We measured the mean ionic charge state of Fe in several 3He-rich and heavy-ion rich energetic particle events during the time period 1998 2000. We combined the ionic charge measurements of CELIAS/STOF onboard SOHO (10 100 keV/nuc) with the measurements of SEPICA onboard ACE (180 550 keV/nuc) to investigate the ionic charge distribution of Fe over a wide energy range. Whereas the mean ionic charge of Fe, Qm(Fe), increases strongly with energy from ˜14 16 at 180 250 keV/nuc to ˜16 20 at 350 550 keV/nuc, the mean ionic charge at lower energies of 10 100 keV/nuc was found to be significantly lower (12.5 ± 0.9). A comparison of the results with steady-state models that include impact ionization by protons and electrons in the low corona shows that the measured increase of Qm(Fe) with energy is often steeper than predicted by the model, and other effects, as for example adiabatic deceleration during the propagation, may play an important role.
Hilchenbach Martin
Kistler Lynn M.
Klecker Berndt
Kucharek Harald
Möbius Eberhard
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