Energetic neutral atom precipitation during magnetic storms - Optical emission, ionization, and energy deposition at low and middle latitudes

Details Energetic neutral atom precipitation during magnetic storms - Optical emission, ionization, and energy deposition at low and middle latitudes Energetic neutral atom precipitation during magnetic storms - Optical emission, ionization, and energy deposition at low and middle latitudes

May 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.1855t&link_type=abstract

Journal of Geophysical Research, vol. 84, May 1, 1979, p. 1855-1864.

Physics

13

Atmospheric Physics, Equatorial Atmosphere, Magnetic Storms, Midlatitude Atmosphere, Precipitation, Atmospheric Ionization, Energy Spectra, Geomagnetic Latitude, Graphs (Charts), Ring Currents

Scientific paper

Evidence of energetic neutral particle precipitation resulting from charge exchange loss of ring current ions during magnetic storms is reported and new calculations of the latitude and time variations of neutral precipitation are presented. Ground based observations of hydrogen Balmer beta and He(+) Paschen alpha emission during two equatorial magnetic storms are found to be consistent with satellite observations of the equatorial aurora during periods of magnetic activity and the ionization rates observed. Calculations of the latitude variation of the loss rate of ions by charge exchange for each equatorial pitch angle show that for a ring current with pitch angle distribution isotropic to the loss cone, the maximum flux of precipitating neutrals is found at latitudes from 25 to 50 deg. The latitude distribution is found to narrow towards the magnetic equator with time. For a typical magnetic storm, the maximum energy input into the thermosphere is calculated to be 0.15 to 0.05 mW/sq m.

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