An Effect of Perpendicular Diffusion on the Anisotropy of Solar Energetic Particles from Unconnected Sources

Details An Effect of Perpendicular Diffusion on the Anisotropy of Solar Energetic Particles from Unconnected Sources An Effect of Perpendicular Diffusion on the Anisotropy of Solar Energetic Particles from Unconnected Sources

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011apj...738...28q&link_type=abstract

The Astrophysical Journal, Volume 738, Issue 1, article id. 28 (2011).

Astronomy and Astrophysics

Astronomy

1

Diffusion, Interplanetary Medium, Sun: Flares, Sun: Particle Emission

Scientific paper

Recently, Tan and coworkers studied the 2001 September 24 solar energetic particle (SEP) event observed by the Wind spacecraft at 1 AU and found that there is a counter-streaming particle beam with a deep depression of flux at 90° pitch angle during the beginning of the event. They suggested that it is a result of a reflecting boundary at some distance outside of 1 AU. While this scenario could be true under some specific configuration of an interplanetary magnetic field, in this paper we offer another possible explanation. We simulated the SEP event by solving the five-dimensional focused transport equation numerically for 40 keV electrons with perpendicular diffusion. We find that a counter-streaming particle beam with deep depression at 90° pitch angle can form on Parker magnetic field lines that do not directly connect to the main particle source on the Sun in the beginning of an SEP event. It can happen when a significant number of observed particles come from adjacent field lines through parallel transport to large radial distance first, hopping across field lines through perpendicular diffusion, and then getting scattered back to 1 AU, where they combine with the particles directly coming from the Sun to form a counter-streaming beam.

Affiliated with

Also associated with

No associations

Rating

An Effect of Perpendicular Diffusion on the Anisotropy of Solar Energetic Particles from Unconnected Sources does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with An Effect of Perpendicular Diffusion on the Anisotropy of Solar Energetic Particles from Unconnected Sources, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and An Effect of Perpendicular Diffusion on the Anisotropy of Solar Energetic Particles from Unconnected Sources will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1079892