Probing Solar Open Magnetic Fields With Near-relativistic Electron Beams.

Details Probing Solar Open Magnetic Fields With Near-relativistic Electron Beams. Probing Solar Open Magnetic Fields With Near-relativistic Electron Beams.

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006spd....37.1102h&link_type=abstract

American Astronomical Society, SPD meeting #37, #11.02; Bulletin of the American Astronomical Society, Vol. 38, p.238

Astronomy and Astrophysics

Astronomy

Scientific paper

To achieve better understanding of our Sun-Earth environment, NASA's Living with a Star (LWS) program addresses question that cut across discipline boundaries. We present preliminary results on probing solar open magnetic fields with near-relativistic electron beams. This effort is directed at the major question: What determines the topology and evolution of the magnetic fields that stretch from the surface of the Sun to the outer boundary of the heliosphere? During nine years of operation, nearly an entire solar cycle, the ACE/EPAM instrument has measured well over 600 near-relativistic electron events. Approximately 30% of these electron events are impulsive with beam-like anisotropies and are predominantly from flares on the western hemisphere. Near-relativistic electrons are accelerated in the low corona and are released onto open coronal field lines, where they propagate nearly scatter-free out to 1 AU. Near-relativistic electrons are ideal probes of coronal open field lines because the transit time to 1 AU is 10 minutes as compared to lower energy ions that spend more time in the interplanetary medium and are therefore much more subject to transport processes. In this work we use observations of electrons from 1 AU, observations of various electromagnetic emissions associated with electron acceleration at the Sun, and observations and models of open magnetic field lines at the Sun to pinpoint the location of electron acceleration.

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