Plasmaspheric EUV image seen from the lunar orbit:Result of Extreme Ultraviolet Telescope onboard KAGUYA spacecraft

Details Plasmaspheric EUV image seen from the lunar orbit:Result of Extreme Ultraviolet Telescope onboard KAGUYA spacecraft Plasmaspheric EUV image seen from the lunar orbit:Result of Extreme Ultraviolet Telescope onboard KAGUYA spacecraft

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm11a1560y&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM11A-1560

Physics

[2760] Magnetospheric Physics / Plasma Convection, [2768] Magnetospheric Physics / Plasmasphere, [2794] Magnetospheric Physics / Instruments And Techniques

Scientific paper

We grew understanding of the plasmaspheric dynamics thanks to the IMAGE-EUV mission. Even though this successful mission ended, we have succeeded in imaging of the terrestrial helium ions (He+) by the Telescope of Extreme Ultraviolet (TEX) aboard Japan's lunar orbiter KAGUYA, by detecting resonantly-scattered emission at 30.4 nm. We completed the instrumental study, UPI-TEX is being routinely operated, and EUV images have become available. The view afforded by the KAGUYA orbit encompasses the plasma (He+) distribution in a single exposure, enabling us to examine for the first time the globally-averaged properties of the plasmasphere from the "side" (meridian) perspective. Here we report the inward motion of the plasmapause on 2 May 2008 seen from the meridian view of the Earth. The plasmapause at the nightside shrunk from the initial L-value to the lower at the rate of 0.3Re/hour. The timing is correlated to the southward turning of IMF, and the displacement is explained by estimation using solar wind parameters.

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