Computer Science – Performance
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsh51b..10s&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #SH51B-10
Computer Science
Performance
7514 Energetic Particles (2114), 2104 Cosmic Rays, 2114 Energetic Particles, Heliospheric (7514)
Scientific paper
We are developing a library of geomagnetic cutoff rigidity models for use in space radiation studies for earth-orbiting spacecraft. This set of cutoff rigidity models includes the magnetic activity quantized by the integer Kp magnetic activity index for every 3 hours in Universal time. These geomagnetic cutoff rigidities were obtained by the trajectory-tracing method in the Tsygenanko geomagnetic field model whereby a particle of specified rigidity is traced back through the model magnetosphere to determine if the orbit is allowed (penetrated the magnetospheric boundary) or re-entrant (i.e. forbidden). Sampling over a rigidity range from 20 GV (a rigidity above the highest possible vertical cutoff) to the lowest possible cutoff allows a determination of the cutoff rigidity. Sampling the penumbra at 0.01 GV intervals allows the determination of the upper cutoff rigidity (Ru), the lower cutoff rigidity (Rl) and the width and transparency of the penumbra. This library of cutoff models is composed of world grids of vertical cutoff rigidities every 5 degrees in latitude and 15 degrees in longitude. The library of models also contains an interpolation procedure for intermediate positions in latitude, longitude, or altitude. Intended for operational use, these results can be presented in terms of both rigidity and particle energy for any element or isotope. Acknowledgement: The trajectory calculations were performed at the Maui High Performance Computer Center.
Shea Margaret Ann
Smart Don Frederick
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