Role of CME-associated magnetic field increases in the Solar Particle Chain

Details Role of CME-associated magnetic field increases in the Solar Particle Chain Role of CME-associated magnetic field increases in the Solar Particle Chain

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm41a..03r&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SM41A-03

Physics

2111 Ejecta, Driver Gases, And Magnetic Clouds, 2134 Interplanetary Magnetic Fields, 7513 Coronal Mass Ejections, 7514 Energetic Particles (2114)

Scientific paper

Large increases (DB) in the interplanetary magnetic field associated with coronal mass ejections (CMEs) play a major role in controlling the intensity histories of solar energetic particles (SEPs) at 1 AU. While a large increase (DB) is en route to Earth, it can attenuate the intensity of the higher energy SEPs that are injected after the CME is launched, while possibly shock-accelerating the lower energy SEPs at the same time. When no significant increase (DB) is between the Sun and the Earth and we are magnetically well connected to the SEP injection site, we observe a beam-like impulsive event whose back-scatter depends upon the structure of the interplanetary field beyond 1 AU. When a large increase (DB) is beyond the Earth at the time of an SEP injection, it can enhance the SEP intensity by forming a reflecting barrier that impedes the escape of the SEPs into the outer heliosphere. The Storms 2002 period (14-24 April) provides examples of all three configurations because of the interleaved sequences of CME launches and SEP events. The different configurations are readily identifiable by their distinctive signatures in the ACE/EPAM electron and ion intensity/anisotropy histories in the half-dozen individual SEP events during the period. The implication for the Solar Particle Chain is that the fluence at Earth from SEP events will vary widely depending upon the configuration of the large increases (DBs) in the interplanetary field (inside and/or outside 1AU) produced by the transits of CMEs.

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