Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm31b2103k&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SM31B-2103
Physics
[7900] Space Weather
Scientific paper
Geomagnetic shielding of solar energetic particles (SEPs) is quantified in terms of cutoff rigidity, which refers to the minimum rigidity (momentum/charge) particle that has access to a given location in the magnetosphere. Cutoff rigidity is dependent on location, direction of incidence and geomagnetic activity level. At geosynchronous, cutoff rigidity has a large directional dependence, with the highest cutoff rigidity corresponding to particles arriving from magnetic east and lowest cutoff rigidity corresponding to particles incident from the west. Consequently, during geomagnetically quiet periods, the SEP flux observed by an eastward looking field of view (FOV) is significantly lower than observed by a westward looking FOV. During geomagnetically disturbed periods, the cutoff is typically suppressed, allowing SEPs access well inside of geosynchronous so that the east-west SEP flux ratio approaches unity. Variations in the east-west SEP flux ratio observed by GOES Energetic Particle Sensors (EPS) have recently been reported by Rodriguez et al. [2010]. In processing EPS count rates into differential fluxes, the differential flux is treated as isotropic and flat over the energy width of the channel. To compare modeled SEP flux with GOES EPS observations, the anisotropy of the flux over the EPS energy range and FOV must be taken into account. A technique for making direct comparisons between GOES EPS observations and SEP flux modeled using numerically computed geomagnetic cutoffs will be presented. Comparisons between modeled and observed flux during the 6-11 December 2006 SEP event will also be shown.
Kress Brian T.
Rodriguez Juan V.
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