Mathematics – Logic
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsa51a0759n&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SA51A-0759
Mathematics
Logic
3334 Middle Atmosphere Dynamics (0341, 0342), 3384 Waves And Tides, 5707 Atmospheres: Structure And Dynamics, 5757 Remote Sensing, 6295 Venus
Scientific paper
The Institute of Space and Astronautical Science, Japan, will launch the Venus meteorological satellite, Planet-C, in 2007. It will start its operation in mid 2009. In order to understand the driving force of the intriguing Venusian wind system called super-rotation, we will observe waves and eddies of wide spectral ranges and evaluate their contributions to momentum transport. For this purpose, we will build 4 imaging cameras with high spatial resolution covering UV (280, 360nm), near-IR (1.0, 1.7, 2.3, 2.4um) and long-IR (9-11um). We will also build a lightning imager. Near-IR channels observe lower clouds around 50 km altitude and the distribution of carbon monooxide below clouds, while UV and long-IR channels cover the cloud top region around 70 km. Multi-wavelength images obtained simultaneously by these cameras, and temperature profiles by radio occultation will visualize the 3-D structure of atmospheric disturbance. The satellite has a 3-axis stabilized attitude control to give the optimum platform for atmospheric imaging. We select an orbit that allows the angular motion of the satellite to be approximately synchronized with the westward mean zonal wind for 20 hours around the apogee region (a perigee altitude of 300 km and an apogee altitude of 13 Venus radii) for continuous observation of each air parcel with high-spatial resolution. The time scale of atmospheric phenomena recorded in such continuous data-sets ranges from several minutes to several months. Such a synchronized orbit will also allow deriving the horizontal wind field from cloud motions with high accuracy.
Imamura Takashi
Nakamura Maho
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