Other
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh41b..07k&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SH41B-07
Other
2114 Energetic Particles (7514), 2139 Interplanetary Shocks, 7514 Energetic Particles (2114), 7807 Charged Particle Motion And Acceleration
Scientific paper
The ionic charge distributions of solar energetic particles (SEP) as observed in interplanetary space provide fundamental information about the origin of these particles, and the acceleration and propagation processes at the Sun and in interplanetary space. In this paper we present a summary of ionic charge observations in interplanetary (IP) shock related SEP events obtained with the SEPICA instrument onboard the Advanced Composition Explorer (ACE) spacecraft in the energy range ~ 0.18-0.43 MeV/n during the time period 1997 - 2000. Because these data obtained in solar cycle 23 will probably be the only source of direct ionic charge state measurements in this important sub-Mev/n energy range before future missions (e.g. SENTINELS) will be operational, an overview on these measurements in IP shock related SEP events may be useful for present and upcoming missions. We analyzed all interplanetary shock related events where SEPICA data are available (~40). We find for most of the events (34) for iron in the energy range 0.18-0.25 MeV/n ionic charge states QFe ~9 - 11 with a significant increase of QFe with energy by 1-2 charge units in this energy range in a few cases. Two of the other six events show high charge states (QFe ~16) at 0.18-0.25 MeV/n with an increase by 3-4 charge units at energies of 0.35-0.43 MeV/n. This is similar to the observations in all Fe-rich and 3He-rich events and the elemental and isotopic composition shows that these two events are indeed 3He- and Fe-rich. The IP shock related ionic charge states will be compared with solar wind charge states and with ionic charge states during the onset phase of the SEP events. The implications of the energy dependence of the ionic charge states on possible sources contributing to the accelerated population (e.g. solar wind, suprathermal particles, contributions from Fe-rich impulsive events) will be discussed in this paper.
Kistler Lynn M.
Klecker Berndt
Möbius Eberhard
Popecki Mark A.
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