Diurnal variations of the boundaries of geomagnetic cut-off and the penetration function

Physics

Scientific paper

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Diurnal Variations, Earth Orbital Environments, Energetic Particles, Geomagnetism, Radiation Dosage, Earth Magnetosphere, Energy Spectra, Satellite Orbits, Vertical Distribution

Scientific paper

The present study examines the influence of the shift of geomagnetic cut-off boundaries toward the equator on the penetration function for near-earth satellite orbits during a magnetically quiet period. A penetration function is derived for a circular satellite orbit with an altitude of 350 km and an inclination of 51.8 deg; in addition, a penetration function is calculated from the IGRF model. It is concluded that when the real boundaries of geomagnetic cut-off are considered, the penetration function ceases to be a function solely of the orbit's spatial geographic coordinates but becomes dependent on the orbital plane inclination in the heliocentric coordinate system and thereby on geomagnetic time.

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