Abundances and Energy Spectra of Corotating Interaction Region Heavy Ions

Details Abundances and Energy Spectra of Corotating Interaction Region Heavy Ions Abundances and Energy Spectra of Corotating Interaction Region Heavy Ions

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsh41b..01m&link_type=abstract

American Geophysical Union, Spring Meeting 2008, abstract #SH41B-01

Physics

2102 Corotating Streams, 7511 Coronal Holes, 7514 Energetic Particles (2114), 7536 Solar Activity Cycle (2162)

Scientific paper

Using instruments on the ACE spacecraft, we have surveyed the heavy ion spectra and composition over the range He-Fe for 41 Corotating Interaction Regions (CIRs) during 1998-2007. Below ~1 MeV/nucleon the spectra are power laws in kinetic energy/nucleon with average spectral index 2.51 +/- 0.10, rolling over above ~1 MeV/nucleon to power law spectra with average index 4.47+/- 0.17. The spectral shape for different species are similar, leading to relative abundances that are constant over our energy range even though the intensities cover up to 8 orders of magnitude. Except for an overabundance of 4He and Ne, the abundances relative to Oxygen are quite close to the abundance of the fast solar wind. We have found 3He/4He ratios to be enhanced over solar wind values in ~40% of the CIRs. The Fe/O ratio in individual CIRs is observed to vary over a factor of ~10, and is strongly correlated with the solar wind Fe/O ratio measured 2-4 days preceding each CIR. Taken together with previous studies showing the presence of pick-up He+ in CIRs, the observational data provides evidence that CIR energetic particles are accelerated out of a suprathermal ion pool that includes heated solar wind ions, pick-up ions, and remnant suprathermals from impulsive solar energetic particle events.

Affiliated with

Also associated with

No associations

Rating

Abundances and Energy Spectra of Corotating Interaction Region Heavy Ions does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Abundances and Energy Spectra of Corotating Interaction Region Heavy Ions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Abundances and Energy Spectra of Corotating Interaction Region Heavy Ions will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1399665