Mathematics
Scientific paper
Apr 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jbis...47..159g&link_type=abstract
British Interplanetary Society, Journal (ISSN 0007-094X), vol. 47, no. 4, p. 159-163
Mathematics
Mathematical Models, Radiation Effects, Solar Protons, Spacecraft Design, Energy Spectra, Fluence, Heavy Ions, Power Spectra
Scientific paper
Large solar proton events are important in the radiation design and operation of spacecraft. The parameters important for radiation design are total event fluence, peak flux, duration, spectra form, heavy ion abundance and propagation. The effects are given of the recent large event of October 1989 on spacecraft along with some results from the latest proton fluence model from JPL. Integral fluence calculations at energies of 1, 4, 10, 30 and 60 MeV were made for the period 1989 to 1991 using IMP 8 spacecraft data. A study of the spectral form of the largest 5 events in each year was carried out; fits using power law in energy, exponential in energy and exponential in rigidity were tried. The best forms were power law in energy and exponential in rigidity and exponential in energy gave poor agreement. In most cases one equation was insufficient to cover the full energy/rigidity, range, better fits being obtained with 2 equations. A comparison with GOES 7 satellite data was made and showed some discrepancies both in total event fluence and spectral hardness.
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