A statistical study on the effects of IMF B(z) and solar wind speed on auroral ion and electron precipitation

Details A statistical study on the effects of IMF B(z) and solar wind speed on auroral ion and electron precipitation A statistical study on the effects of IMF B(z) and solar wind speed on auroral ion and electron precipitation

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96.5525b&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, April 1, 1991, p. 5525-5538.

Physics

18

Auroral Zones, Electron Precipitation, Interplanetary Magnetic Fields, Ion Distribution, Solar Terrestrial Interactions, Solar Wind Velocity, Dmsp Satellites, Earth Magnetosphere, Geomagnetism, Statistical Analysis

Scientific paper

A large data set of precipitating electrons and ion measurements are used to determine the variations in the hemispheric power input and number flux due to these particles as a function of polarity and magnitude of the IMF B(z) component and as a function of the magnitude of the solar wind velocity. Both the hemispheric energy flux and hemispheric number flux are found to vary in a simple and consistent manner with both B(z) and V(sw). For both electron and ion fluxes, the variation with B(z) tends to a minimum for weak to moderately strong B(z) positive and increases at a rate faster than linear for values both above and below the minimum. The variation in the values with V(sw) tends to be linear with the steepest slopes for the electron hemispheric energy flux. The ions make the largest contribution relative to the electrons for the lowest velocity and the highest value of B(z) positive. The relative contribution decreases sharply for decreasing values of B(z) positive and for increasing velocity.

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