Concurrent Observations of Low Altitude Precipitating Ion Spectra using TWINS ENA Images and DMSP in situ Ions

Details Concurrent Observations of Low Altitude Precipitating Ion Spectra using TWINS ENA Images and DMSP in situ Ions Concurrent Observations of Low Altitude Precipitating Ion Spectra using TWINS ENA Images and DMSP in situ Ions

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm51b2065b&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM51B-2065

Physics

[2704] Magnetospheric Physics / Auroral Phenomena, [2716] Magnetospheric Physics / Energetic Particles: Precipitating

Scientific paper

Low altitude emission (LAE) of energetic neutral atoms (ENAs) is the brightest signature observed in the Earth's magnetosphere by the Two Wide Angle Imaging Neutral atom Spectrometers (TWINS) spacecraft, with peak emission typically an order of magnitude above the background at all energies. The TWINS imagers create global energetic neutral atom (ENA) images in the energy range 1-60 keV/nuc. We have identified bright LAE events, observed by TWINS, between October 2010 and March 2011. For each event, we are analyzing simultaneous precipitating ion spectra observed in situ by several DMSP spacecraft. We use the thick target approximation developed by Roelof (that describes multiple charge-exchange, stripping, ionization and excitation collisions with exospheric oxygen atoms at 200-300 km altitude), in order to compare the ion spectra inferred from the TWINS ENA images with the measured ion spectra from DMSP. Preliminary analysis suggests that spectra from these events are consistent with spectra for the 11 October 2008 event previously reported by Bazell et al. [JGR, 2010]. These spectra exhibited a characteristic non-thermal signature of decreasing flux with increasing energy and no identifiable peak in the emission spectra above 1 keV/nuc.

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