Statistics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsh53b..02k&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SH53B-02
Statistics
7509 Corona, 7514 Energetic Particles (2114), 7859 Transport Processes, 7959 Models
Scientific paper
Survey of helium isotope abundance data (1997--2005) measured with the Ultra-Low-Energy Isotope Spectrometer (ULEIS) on the Advanced Composition Explorer ( ACE) has revealed multiday periods of 3He-rich solar energetic particles (SEPs) in the energy range of ~0.4--10 MeV nucleon-1 with 3He/4He~0.1--1. We analyze 17 periods, where there were good counting statistics, using also in situ measurements of solar wind at ACE and Solar and Heliospheric Observatory ( SOHO) along with solar observations by SOHO telescopes, to study coronal and interplanetary magnetic field structures associated with multiday periods of 3He-rich SEPs. Then we employ a simple model of corotating compression in solar wind to estimate possible effect of observed solar wind profiles on confinement of 3He- rich SEPs in interplanetary magnetic field structures, which indicates that the large-scale compressions in solar wind is one of significant factors contributing to occurrence of multiday periods of 3He-rich SEPs.
Didkovsky Leonid
Judge Darrell L.
Kocharov Leon
Laivola Jarno
Mason Glenn M.
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