Comparison of ENA Ion Temperature Calculation Technique to Model Predictions

Details Comparison of ENA Ion Temperature Calculation Technique to Model Predictions Comparison of ENA Ion Temperature Calculation Technique to Model Predictions

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agusmsm73a..05s&link_type=abstract

American Geophysical Union, Spring Meeting 2009, abstract #SM73A-05

Physics

2764 Plasma Sheet, 2790 Substorms

Scientific paper

Because ion heating has been correlated with several magnetospheric phenomena that occur on varying spatial and temporal scales, including magnetic reconnection, instabilities, and convection of plasma through different regions of the magnetosphere, it is inherently difficult to establish a reliable model of ion temperatures in the magnetosphere. Using a technique to calculate effective ion temperatures based on the charge- exchange cross section-corrected energetic neutral atom (ENA) flux versus energy spectrum, we have recently shown that, during certain storm intervals, there is a significant difference between our calculated plasma sheet ion temperatures and those predicted using a statistical correlation with the solar wind velocity. We will present our ion temperature calculations in comparison with those predicted by two such correlation models given by Borovsky et al. [1998] and Tsyganenko and Mukai [2003]. The Comprehensive Ring Current Model (CRCM) is often using in conjunction with ENA data to study the physical mechanisms responsible for features seen in the data. We will present a comparison of our ion temperature calculation technique applied ENA flux maps generated by CRCM with those calculated directly within the model.

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