A new proton auroral extrapolation method applied in the estimation of FUV emission yields

Details A new proton auroral extrapolation method applied in the estimation of FUV emission yields A new proton auroral extrapolation method applied in the estimation of FUV emission yields

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa33b1772k&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SA33B-1772

Physics

[0310] Atmospheric Composition And Structure / Airglow And Aurora, [0358] Atmospheric Composition And Structure / Thermosphere: Energy Deposition, [2455] Ionosphere / Particle Precipitation, [2704] Magnetospheric Physics / Auroral Phenomena

Scientific paper

A new method for extrapolating proton auroral fluxes above 30 keV has been developed and applied to the problem of testing model-derived proton auroral yields for Lyman-alpha and Lyman-Birge-Hopfield (LBH) emissions in the far ultraviolet (FUV) wavelength range. Previous analysis of coincident particle and FUV emission observations from the Defense Meteorological Satellite Program (DMSP) F16 satellite has indicated that, for LBH emissions, the ratio of proton aurora efficiency to electron aurora efficiency is greater than was predicted by models. Because of the upper energy limit of 30 keV on the SSJ/5 particle detector on F16, this analysis required the use of an extrapolation method to specify proton fluxes above 30 keV. In more recent work, it was determined that there was a problem with the earlier extrapolation method because of its sensitivity to column emission rate (CER) lower thresholds applied to the data. This led to a downward revision in the ratio of proton to electron LBH emission efficiencies. Now a new extrapolation method has been developed which is less sensitive to CER thresholds. It specifies proton fluxes above 30 keV using a combination of 1) Lyman-alpha CERs measured by SSUSI, 2) particle fluxes below 30 keV measured by SSJ/5, and 3) a climatology relating Lyman-alpha intensities to spectral hardness. The new extrapolation method has been tested with the entire set of NOAA-17 2003 POES TED and MEPED measurements of proton fluxes up to 800 keV, and subsets thereof, and the statistical bias has been shown to be small. The new proton extrapolation method is applied to coincident SSUSI and SSJ/5 observations to obtain new estimates of the proton auroral Lyman-alpha efficiency and the relative LBH efficiencies for proton and electron aurora.

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