Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufm.p51b1203u&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #P51B-1203
Physics
0335 Ion Chemistry Of The Atmosphere (2419, 2427), 5405 Atmospheres (0343, 1060), 5410 Composition (1060, 3672), 5435 Ionospheres (2459), 7538 Solar Irradiance
Scientific paper
The effects of long-term solar activity changes such as 11-year cycle and 27-day cycle on the Venus ionosphere have been investigated by a number of researchers using data obtained from some spacecrafts. However, the effects of short-term solar activity changes, particularly the effect of solar flares, are still unknown because there are no simultaneous observations of the Venus ionosphere and solar flares. The past observations of the Earth's ionosphere suggest significant and instantaneous changes of the Venus ionosphere during solar flares. Recently, Mars Global Surveyor (MGS) revealed the temporal variations of the Mars ionosphere during solar flares. The electron density of the Mars ionosphere was enhanced by ~10% at the main peak and 200% at the secondary peak at that time. The recent satellite observations of the solar X- rays enable us to model the Earth's and planetary ionospheres more exactly. In order to investigate the temporal variations of the Venus ionosphere during solar flares, we have developed a 1-D photochemical model for estimating vertical profiles of ions and electrons. We have also modeled temporal variations of solar flare using the EUV/X-rays data obtained by TIMED/SEE (0.1-194 nm) and GOES (0.1-0.8 nm) on October 28, 2003. Using the photochemical and solar flare models, we have calculated temporal variations of ion composition in the dayside Venus ionosphere. In addition, time constants for production and loss of ionospheric compositions through the photochemical reactions can be examined. We discuss differences of the response to solar flare among three planets, Venus, Earth and Mars. Then, the characteristics of the Venus ionosphere will be clarified.
Fujiwara Hideaki
Fukunishi Hiroshi
Uesugi Akira
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