On the Helical Fields Guiding Near-Relativistic Electron Beams in the Heliosphere

Details On the Helical Fields Guiding Near-Relativistic Electron Beams in the Heliosphere On the Helical Fields Guiding Near-Relativistic Electron Beams in the Heliosphere

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009spd....40.3202r&link_type=abstract

American Astronomical Society, SPD meeting #40, #32.02; Bulletin of the American Astronomical Society, Vol. 41, p.865

Astronomy and Astrophysics

Astronomy

2

Scientific paper

Wavelet processing of the LASCO images of the solar corona brings out many subtle details that are easily missed in the intensity images. Specifically, wavelet processing can enhance the edges on large and small scales making it easier to detect and define helical features. We used the processed LASCO images obtained during the period 1997 -2001 to study the structure and motions of nearly radial streamers extending from coronal holes adjacent to flaring active regions. Some of the streamers show outward-propagating twist. These helical fields extend into the heliosphere where they would reach 1 AU with a path length generally greater than the 1.2 AU of idealized fields following the Parker spiral. We focused on the regions from our earlier work (Rust et al., ApJ 687, 635, 2008) on flares associated with beams of near-relativistic electrons detected at 1 AU with the ACE spacecraft. Our study shows that the electron beam's typical delay of about 10 min in arriving at 1 AU may be due to their following a helical path from Sun to Earth. According to the reconnection jet model, the helical component may be introduced to open fields by earlier events involving reconnections with emerging, twisted flux ropes. Our study implies that the escaping electrons may be accelerated at the same time as the trapped electrons that produce X-ray flare emissions.
NASA supported this work with grant NNG 05GM69G.

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