Comparison of TWINS Images of Low-Altitude Emission of Energetic Neutral Atoms with DMSP Precipitating Ion Fluxes: New Events

Details Comparison of TWINS Images of Low-Altitude Emission of Energetic Neutral Atoms with DMSP Precipitating Ion Fluxes: New Events Comparison of TWINS Images of Low-Altitude Emission of Energetic Neutral Atoms with DMSP Precipitating Ion Fluxes: New Events

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa41a1709b&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SA41A-1709

Physics

[2407] Ionosphere / Auroral Ionosphere, [2455] Ionosphere / Particle Precipitation, [2736] Magnetospheric Physics / Magnetosphere/Ionosphere Interactions

Scientific paper

Low altitude emissions (LAE) observed in TWINS1/2 stereo ENA images (2-64 keV) are used to infer precipitating ion spectra using the “thick target” approximation for multiple atomic collisions between protons incident on the Earth’s monatomic oxygen exosphere (200-800 km). The technique has been described and validated for a particular TWINS storm observation (11 October 2008) by Bazell et al. (JGR, in press, 2010). We are compiling a catalog of near-simultaneous DMSP passes above the TWINS ENA LAE in which we can compare the in situ DMSP (1-30 keV) precipitating ion spectra, with the ion spectra inferred from the ENA spectra in the corresponding TWINS pixels. In order to make this comparison between the LAE (imaged by TWINS in 4°x4° pixels) to DMSP observations of ion precipitation at 825 km (with 1-second, or ~7 km cadence), we time-average the DMSP observations corresponding to the largest scale auroral features (which will dominate the TWINS images). At this stage only the spectral shapes are compared, because the precipitation pattern cannot be resolved by the finite-sized TWINS pixels. We show comparisons for several additional events in 2009-2010 and obtain reasonable agreement with the spectral shape between TWINS and DMSP, demonstrating the applicability of the thick target approximation for ENA imaging to this problem.

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