Radial Transport of Radiation Belt Electrons on Multiple Time Scales

Details Radial Transport of Radiation Belt Electrons on Multiple Time Scales Radial Transport of Radiation Belt Electrons on Multiple Time Scales

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm21b..06h&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM21B-06

Physics

[2774] Magnetospheric Physics / Radiation Belts

Scientific paper

Recent observations indicate that radial transport of radiation belt electrons during geomagnetic storms is enhanced by ULF wave activity, and that resulting transport occurs at a rate which exceeds nominal radial diffusion estimates but is slower than prompt injection on a drift time scale. Whether such behavior can best be characterized as diffusive is an open question. A method for examining radial transport time scales, ranging from prompt injection to radial diffusion, is MHD-test particle simulations driven by measured solar wind input. Simulations will be compared for four CME-driven storms in February, 1994; July and November, 2004; and January, 2005, where in situ solar wind driving conditions were available, along with measurements of MeV electron fluxes from SAMPEX and other spacecraft. The effect of a dynamic geosynchronous boundary condition on radial diffusion of radiation belt electrons over a longer time scale (more than one solar rotation) has been calculated for two of the storms for comparison with the prompt injection results. It is found that for storms with a strong Sudden Impulse, e.g. November 2004, indicating compression of the dayside magnetopause, that prompt injection plays a significant role; while radial transport over longer time scales, indicating enhanced radial diffusion due to ULF wave activity, dominates periods of more gradual build up of outer zone electrons, such as the July 2004 multiple storm period. Observations and simulations indicate that ULF oscillations following a Sudden Impulse transport electrons radially on a time scale much faster than nominal radial diffusion rates. Examples will be given from the February 1994 and November 2004 storms.

Affiliated with

Also associated with

No associations

Rating

Radial Transport of Radiation Belt Electrons on Multiple Time Scales 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 Radial Transport of Radiation Belt Electrons on Multiple Time Scales, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Radial Transport of Radiation Belt Electrons on Multiple Time Scales will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1877791