The Delay of Low-energy Particle Populations in Association with Large Solar Energetic Particle Events

Details The Delay of Low-energy Particle Populations in Association with Large Solar Energetic Particle Events The Delay of Low-energy Particle Populations in Association with Large Solar Energetic Particle Events

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsh41a..11a&link_type=abstract

American Geophysical Union, Spring Meeting 2008, abstract #SH41A-11

Physics

2139 Interplanetary Shocks, 2159 Plasma Waves And Turbulence, 7514 Energetic Particles (2114), 7851 Shock Waves (4455), 7868 Wave/Wave Interactions

Scientific paper

Using ~0.045-10 MeV/nucleon ion data from ACE/ULEIS, we have found that a substantial number of shock- associated solar energetic particle events (~20 events) have significant delays in the arrival of the low- energy component beyond what is expected from the travel time of energetic particles from the sun to the earth at 1 AU. Indeed, for some events, after correcting for the velocity dispersion, the low energy component (~sub- MeV/nucleon) is almost completely absent while the high-energy component (E > 1 MeV/nucleon) has very large enhancements. SEP events with the most dramatic initial depletion of low-energy particles are accompanied by large proton fluxes and have large enhancements of the low-energy particles later, in coincidence with the arrival of the interplanetary shock, a day or two after the start of the event. In addition, these events show Fe/O enhancements during the periods in which the low-energy component is depleted and lower Fe/O values once the shock arrives. These new observations appear to be explained by the trapping of particles with low energy-to-charge (E/Q) ratios in the vicinity of the shock by magnetohydrodynamic waves, possibly generated by high energy protons streaming along the magnetic field lines.

Affiliated with

Also associated with

No associations

Rating

The Delay of Low-energy Particle Populations in Association with Large Solar Energetic Particle Events 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 The Delay of Low-energy Particle Populations in Association with Large Solar Energetic Particle Events, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Delay of Low-energy Particle Populations in Association with Large Solar Energetic Particle Events will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1399635