Plasma Wave Environment Measured by LRS/WFC Onboard KAGUYA (SELENE)

Details Plasma Wave Environment Measured by LRS/WFC Onboard KAGUYA (SELENE) Plasma Wave Environment Measured by LRS/WFC Onboard KAGUYA (SELENE)

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.p31b1394k&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #P31B-1394

Computer Science

Sound

2159 Plasma Waves And Turbulence, 6025 Interactions With Solar Wind Plasma And Fields, 6250 Moon (1221), 6984 Waves In Plasma (7867), 6994 Instruments And Techniques (1241)

Scientific paper

KAGUYA (SELENE) is a Japanese moon orbiter launched on September 14, 2007. The Lunar Radar Sounder (LRS) is one of the scientific instruments on board KAGUYA. It consists of three subsystems: the sounder observation (SDR), the natural plasma wave receiver (NPW), and the (WFC). The WFC measures two components of electric wave signals detected by the two orthogonal 30 m tip-to-tip antennas from 100Hz to 1MHz. By taking advantage of a moon orbiter, the WFC is expected to measure plasma waves related to solar wind-moon interaction, mini-magnetosphere caused by magnetic anomaly on the lunar surface and radio emissions to be observed from the moon. In the initial checkout phase of KAGUYA, from the end of October to middle of November 2007, data acquisition of the WFC was continuously performed almost 24 hours a day. In this period, KAGUYA is in the solar wind and several kinds of natural plasma waves were observed. In the higher frequency range around a few hundreds kHz, radio emissions such as AKR (auroral kilometric radiation) and type III bursts were observed. The most interesting spectral feature obtained by the WFC is intense electrostatic wave, which is assumed to be UHR or Langmuir wave. This wave is constantly observed in the frequency range of 10-20kHz in the sunlit region in the solar wind, while the frequency suddenly decreases in the shade (occultation) region. This feature is quite similar to the observation by the WIND spacecraft when WIND crossed the lunar wake at a distance of ~6.8 lunar radii. On the other hand, KAGUYA orbits the moon at an altitude of 100 km and the encounter of the lunar wake occurs in much closer region and varieties of frequency transition were observed at the boundary of the sun-lit and shade region depending on the orbital condition of KAGUYA, suggesting the spatial structure of the lunar wake Acknowledgments: The SELENE project has been organized by the Japan Aerospace Exploration Agency (JAXA). The authors express their thanks to all members of the SELENE project team.

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