Multispacecraft Observations of Few-MeV SEP Ion Event Onsets Near Earth

Details Multispacecraft Observations of Few-MeV SEP Ion Event Onsets Near Earth Multispacecraft Observations of Few-MeV SEP Ion Event Onsets Near Earth

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsh42a0480e&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SH42A-0480

Physics

Plasma Physics

2100 Interplanetary Physics, 2400 Ionosphere, 2700 Magnetospheric Physics, 7500 Solar Physics, Astrophysics, And Astronomy, 7800 Space Plasma Physics

Scientific paper

Few-MeV-energy SEP proton flux onsets observed in interplanetary space near Earth are used to investigate the effectiveness of a single spacecraft stationed at the sunward L1 libration point ( ˜230 Re) to provide complete early warning information about Solar Energetic Particle (SEP) events. Knowledge of the behavior and distribution of few-MeV-energy protons at onset aids development of asset protection, predictive capabilities, and understanding of magnetospheric disturbances related to SEP appearance at Earth. Widely separated spacecraft, ACE near L1 and GOES-8, Geotail, and IMP-8 nearer to Earth ( ˜6.6-44 Re), provided simultaneous SEP observations from late 1997 to the present. A number of cases of spatial-temporal intensity variations between L1 and nearer-Earth observations are presented. Cases presented demonstrate large-scale transport characteristics both consistent and inconsistent with simple outward radial propagation (i.e., convection with the solar wind) of a locally planar feature over the ˜230 Re ( ˜0.01 AU) maximum separation distance.

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