Other
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...200.5713c&link_type=abstract
American Astronomical Society, 200th AAS Meeting, #57.13; Bulletin of the American Astronomical Society, Vol. 34, p.738
Other
Scientific paper
We present a theoretical model for O+5 (O+7) ions as test particles in the fast solar wind, using a previous turbulence-driven four-fluid model to establish the background solar wind which consists of electrons, protons, alpha particles and O+6 ions. The O+5 (O+7) ions in our model and the O+6 ions in the background are driven by the same mechanism, say, the resonant cyclotron interaction or artificial heating additions. The ionization and recombination processes of O ions are taken into account. It is shown that the differential flow speeds between O+6 and O+5 or O+7, which are found to be in the range of 0.3 to 2, play very different roles in the formation of O charge states. This is due to discrepancy between the freezing-in distances of the two ion species. O+7 forms predominantly below 1.2 RS too close to the Sun to develop a differential streaming between O ions. O+5 on the other hand, freezes-in at about 1.8 RS where differential flows are well developed and therefore important for the formation of O+5 ions.
Chen Yafeng
Esser Ruth
Hu Yan
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