3He-enrichments in solar energetic particle events: SOHO/COSTEP observations
Abstract
We present first results based on a systematic survey of 4-41 MeV/N 3He/4He isotope abundances with ratios >0.01 detected by the COmprehensive SupraThermal and Energetic Particle analyzer (COSTEP) onboard the SOHO (SOlar and Heliospheric Observatory) spacecraft. During 53 out of 148 identified days with a 3He/4He ratio >=0.01, the ratio was in the range 0.1-1.0. For days with sufficiently high detector count rates, the atomic mass plots could be resolved up to a time resolution of 1 hour. These days were most suitable for comparisons with in situ solar wind plasma and magnetic field measurements and SOHO's optical white-light and extreme ultraviolet (EUV) observations of the Sun. Here we present a brief overview of a 3He/4He-rich particle event detected on October 30, 2000 that was associated with the passage of a fast CME. .
- Publication:
-
Joint SOHO/ACE workshop "Solar and Galactic Composition"
- Pub Date:
- November 2001
- DOI:
- 10.1063/1.1434023
- Bibcode:
- 2001AIPC..598..349B
- Keywords:
-
- 98.70.Sa;
- 96.60.Vg;
- 96.60.Jw;
- 95.75.Wx;
- Cosmic rays;
- Particle emission solar wind;
- Solar interior;
- Time series analysis time variability