First Ion Temperature Images From TWINS Data

Details First Ion Temperature Images From TWINS Data First Ion Temperature Images From TWINS Data

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agusmsm73a..06k&link_type=abstract

American Geophysical Union, Spring Meeting 2009, abstract #SM73A-06

Statistics

2730 Magnetosphere: Inner, 2740 Magnetospheric Configuration And Dynamics, 2788 Magnetic Storms And Substorms (7954)

Scientific paper

Ion heating has been correlated with several magnetospheric phenomena, including magnetic reconnection, instabilities, and convection of plasma through different regions of the magnetosphere. Thus, it important to be able to measure ion temperatures throughout the magnetosphere to better understand the physics of these phenomena. Effective ion temperatures based on the charge-exchange cross section-corrected energetic neutral atom (ENA) flux versus energy spectrum can be calculated from TWINS data. Effective ion temperatures calculated from the Medium Energy Neutral Atom (MENA) imager on the IMAGE spacecraft using this technique were shown to have excellent (within ~30%) agreement with in-situ measurements from MPA instruments on LANL geosynchronous spacecraft and GEOTAIL. In order to achieve adequate statistics for reliable ion temperature calculations, we can use either data with significant ENA flux rates, such as during geomagnetic storms, or superpositions of multiple data sets. We present ion temperature images from the few small storms that have occurred so far in the TWINS mission. We will present both 'skymap' images as well as 2-D maps created using an algorithm to project the data along each pixel's line-of-sight to the equatorial plane of the Geocentric Solar Magnetospheric (GSM) coordinate system. During intervals for which data is available from both TWINS I and II, we will compare the locations of interesting features as seen by the two satellites.

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