Iron Ionic Charge States at Suprathermal Energies: a Tracer for Local Acceleration at ICME-Related Interplanetary Shocks

Details Iron Ionic Charge States at Suprathermal Energies: a Tracer for Local Acceleration at ICME-Related Interplanetary Shocks Iron Ionic Charge States at Suprathermal Energies: a Tracer for Local Acceleration at ICME-Related Interplanetary Shocks

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsh31a1466k&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SH31A-1466

Astronomy and Astrophysics

Astrophysics

[2111] Interplanetary Physics / Ejecta, Driver Gases, And Magnetic Clouds, [2114] Interplanetary Physics / Energetic Particles, [2139] Interplanetary Physics / Interplanetary Shocks, [7513] Solar Physics, Astrophysics, And Astronomy / Coronal Mass Ejections

Scientific paper

With advanced instrumentation on the ACE and SOHO spacecraft heavy ion charge state measurements are available from the solar wind (SWICS/ACE) up to suprathermal energies of ~500 keV/amu (STOF/CELIAS/SOHO, SEPICA/ACE). In this paper we compare the mean ionic charge of Fe in interplanetary shock related solar wind with the ionic charge of iron in the suprathermal (< 100 keV/amu) energy range. For the majority of interplanetary shock related events the mean ionic charge of suprathermal iron is found to be in the range ~9-11, compatible with mean iron charge states as observed in slow and fast solar wind. However, in a systematic search based on one-day averages of the mean ionic charge of iron in the energy range 10 to 100 keV/amu, obtained with the STOF sensor onboard SOHO during 2001 to 2004, we find several cases with a mean ionic charge of Fe in the range 12 to 15. The time periods with high charge states at suprathermal energies are related to the passage of ICMEs and interplanetary shocks, with charge states up to ~15 in the concomitant ICME-related solar wind, suggesting local acceleration. Although high ionic charge states of Fe are frequently observed in ICME-related solar wind, the observation at suprathermal energies is rather infrequent, with only a few cases per year. The conditions leading to high charge states of Fe at suprathermal energies will be discussed. One of the necessary conditions seems to be related to multiple ICMEs and interplanetary shocks, with fast shocks overtaking preceding ICMEs, that provide the source population with high ionic charge states of iron.

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