The latitudinal variation of the charge exchange induced atomic hydrogen escape flux

Computer Science – Sound

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Atmospheric Models, Charge Exchange, Hydrogen Atoms, Ionospheric Sounding, Diurnal Variations, Electron Energy, Equinoxes, Geophysics, Ion Temperature, Isis Satellites

Scientific paper

Using plasma data from the Isis 2 spacecraft and Arecibo radar, diffusive equilibrium models of the ionosphere were constructed for equinox conditions. These plasmaspheric models were combined with models of the neutral atmosphere to calculate the atomic hydrogen escape flux due to charge exchange between thermal protons and to calculate cooler hydrogen and oxygen atoms as a function of dipole latitude and local time. These calculations showed that the daytime escape flux increases as the absolute value of the dipole latitude decreases, reaching its maximum value at the magnetic equator. At 15 hours local time (LT) on March 23, 1972, the calculated escape flux varied from an insignificant amount at 55 deg dipole latitude, to 3 x 10 to the 8th atoms/sq cm sec at the magnetic equators.

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