Statistics – Applications
Scientific paper
Oct 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994adspr..14..787s&link_type=abstract
Advances in Space Research, vol. 14, no. 10, p. 787-797
Statistics
Applications
19
Earth Magnetosphere, Magnetic Anomalies, Magnetic Dipoles, Radiation Shielding, Space Plasmas, Spacecraft Orbits, Approximation, Distortion, Geomagnetic Pulsations, Geometric Accuracy, Magnetic Disturbances, Mathematical Models
Scientific paper
The earth's magnetic field acts as a shield against charged particle radiation from interplanetary space, technically described as the geomagnetic cutoff. The cutoff rigidity problem (except for the dipole special case) has 'no solution in closed form'. The dipole case yields the Stormer equation which has been repeatedly applied to the earth in hopes of providing useful approximations of cutoff rigidities. Unfortunately the earth's magnetic field has significant deviations from dipole geometry, and the Stormer cutoffs are not adequate for most applications. By application of massive digital computer power it is possible to determine realistic geomagnetic cutoffs derived from high order simulation of the geomagnetic field. Using this technique, 'world-grids' of directional cutoffs for the earth's surface and for a limited number of satellite altitudes have been derived. However, this approach is so expensive and time comsuming it is impractical for most spacecraft orbits, and approximations must be used. The world grids of cutoff rigidities are extensively used as lookup tables, normalization points and interpolation aids to estimate the effective geomagnetic cutoff rigidity of a specific location in space. We review the various options for estimating the cutoff rigidity for earth-orbiting satellites.
Shea Margaret Ann
Smart Don Frederick
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