Observations of a 3He-rich SEP Event over a Broad Range of Heliographic Longitudes: Results from STEREO and ACE.

Observations of energetic ions and electrons from STEREO and ACE have been used to investigate the longitudinal extent of particle emissions from ³He-rich solar energetic particle (SEP) events. In the event of 3–4 Nov 2008, ions and electrons were detected 20° ahead and behind the nominal connection from the source region to 1 AU, and electrons were also detected 60° ahead. The results are consistent with those of earlier studies that correlated data from near-Earth spacecraft with Helios data or with observations of source regions on the Sun. [ABSTRACT FROM AUTHOR]