Earth Plasmasphere EUV Imaging from the Lander of the Second Phase of Chinese Lunar Exploration Program The Scientific Objective

Details Earth Plasmasphere EUV Imaging from the Lander of the Second Phase of Chinese Lunar Exploration Program The Scientific Objective Earth Plasmasphere EUV Imaging from the Lander of the Second Phase of Chinese Lunar Exploration Program The Scientific Objective

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm52a..06x&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM52A-06

Other

2768 Plasmasphere, 6250 Moon (1221)

Scientific paper

We have proposed a EUV Imager (EUVI) onboard the lander of the Second Phase of the Chinese Lunar Exploration Program that will be launched around 2013, and expect to have continuous images observed from side of the plasmasphere, from the 30.4 nm emission of He+. Since the spinning period of the Moon is equal to its rotation period, if an imager is installed toward the Earth initially, the field of view (FOV) of the imager will remain almost pointing to the Earth. The small deviation of the direction of the FOV, due to the elliptic orbit of the moon and the deviation between the plane of the lunar orbit and Earth's ecliptic plane, can be adjusted each day by a pivoted platform. The EUVI will keep in a dormant state at lunar night, when the temperature of the lunar surface is low; and will power down when the solar radiation penetrates into the imager, so it will provide continuous images of the plasmasphere in nearly half a month period, Using a 3-D model of charged particles moving in a dipole magnetic field and a co-rotation electric field plus a uniform dawn-dusk electric field varying with Kp index, we computed 3-D plasmaspheric particle distribution. The particle distribution projecting to the equatorial plane, is similar to the result of IMAGE satellite at its apogee. The result shows that during disturbance when Kp increases, some particles inside the original plasmapause form a long tail, and stretching toward to magnetopause in the dusk region. But from the side direction, the particles spread up and down ward, forming a "fish tail", which is what we expect to observe from the Lunar orbit. Moreover if we have another EUVI onboard the High Elliptical Orbit Satellite, which will simultaneously provide the images of the Plasmasphere from the top. Using both the images from the Lunar and the high elliptical orbit, we can create the 3 dimensional picture and global distribution of the plasma density in the plasmasphere by the computer tomography technique. Joint data analysis of the EUVI using Institut d'Aeronomie Spatiale de Belgique plasmaspheric models is also being considered, and other cooperation is also welcome.

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