Probing Open Magnetic Fields at the Sun with near-relativistic electron beams

Details Probing Open Magnetic Fields at the Sun with near-relativistic electron beams Probing Open Magnetic Fields at the Sun with near-relativistic electron beams

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsh43b..06h&link_type=abstract

American Geophysical Union, Spring Meeting 2008, abstract #SH43B-06

Physics

7511 Coronal Holes, 7514 Energetic Particles (2114), 7524 Magnetic Fields, 7594 Instruments And Techniques

Scientific paper

Processes associated with solar flares accelerate and inject near-relativistic electrons onto open coronal field lines. Some of these electron events propagate nearly scatter-free to 1 AU, where their spectra and angular distributions can be measured. We used a carefully selected list of electron events for which both the solar and near-Earth positions are well known. Soft X-ray images from Yohkoh determined the positions of coronal holes near active regions as well as the flares associated with the electron events. We chose relatively small events that exhibit nearly Gaussian shaped time-intensity profiles. These events should incur minimal coronal and heliospheric transport effects, which can affect the Sun-to-Earth path length. Twenty-five events met our criteria for inclusion in the study. We use three different methods to estimate the path-length of the electrons and two different potential-field source-surface calculations to trace the open fields from their intersection with the heliospheric field at 2.5 solar radii down to the base of the corona. We report on the successes and failures of these PFSS models to identify open fields in/near active regions and to indicate correctly which open coronal fields are connected to the interplanetary magnetic field at Earth.

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