Other
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsh33b..08c&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SH33B-08
Other
7519 Flares, 7900 Space Weather, 7984 Space Radiation Environment, 2114 Energetic Particles (7514)
Scientific paper
We use publicly available >10 MeV proton/ion data from the near-Earth ACE, Wind, IMP-8, and GOES spacecraft to investigate the arrival/onset of >10-MeV energy Solar Energetic Particle, SEP, event protons near Earth from late 1997 to 2005. The >10-MeV protons are an important radiation hazard concern for near- Earth space assets and in the afterglow of the January 20, 2005 SEP event it is important to derive as much information as possible about these ions from the scientific archive. For each proton event in this study a set of observations made between L1 (225 Re sunward) and the region near Earth are collected. Observations for a number of proton event enhancements are consistent with conventional outward transport from the sun. During some other large proton event enhancements, the onset intensity-time profiles of >10-MeV and >30-MeV protons demonstrate that these ions can arrive near and between L1 and Earth within the 5- to 10-min averaging intervals used in this study. This result is inconsistent with a single, unique, solar flare particle release and the expected subsequent time delay for: (a) direct, scatter-free single particle propagation along the IMF from the sun to Earth and/or (b) radial solar wind convection from L1 to Earth. At times, the proton flux measured shortly after onset in Earth's magnetosphere increases more rapidly than the concurrently- measured post-onset proton flux upstream. This study is one step toward a fuller understanding of temporal/spatial upstream variations of >10-MeV proton event onsets.
Christon Stephen P.
Decker Robert B.
Eastman Timothy E.
Roelof Edmond C.
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