Computer Science – Sound
Scientific paper
Jun 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995dps....27.0701n&link_type=abstract
American Astronomical Society, DPS Meeting #27, #07.01; Bulletin of the American Astronomical Society, Vol. 27, p.1071
Computer Science
Sound
3
Scientific paper
The first Hubble Space Telescope observation of Venus was made on 25 January 1995 when Venus was about 46° away from the sun. A total of three GHRS spectra and two WFPC2 images were obtained. The GHRS spectra were obtained with the G200M grating and the Echelle-B grating. The G200M grating was centered on 207 and 216 nm, and the Echelle-B was centered on 207 nm. The WFPC2 images were obtained with the F218W and F255W filters.
From the GHRS spectra, we derive the amount of SO2 at the cloud top region of Venus. Our estimate of SO2 abundance above the clouds of Venus is 20± 10 ppb at 40 mbar, and the scale height of SO2 at the same altitude is around 2 km. Comparison with other observations shows that the amount of SO2 above the clouds of Venus is lower by about factor of 2 to 5 than the amount derived from the most recent sounding rocket observations in 1991.
The ratio of two WFPC2 images of Venus shows the dark markings in the clouds of Venus. The dark markings seen in the ratio image are similar to the dark markings seen at 365 nm by Pioneer Venus. The dark area in the ratio image is where SO2 and other possible UV absorbers have higher concentration than the surrounding area. Thus, we will be able to study the horizontal distribution of SO2 and other UV absorbers with the WFPC2 images.
The combination of GHRS spectra and WFPC2 images allows us to estimate the disk integrated average mixing ratio of SO2 above the clouds, and thus constrain the global sulfur cycle. Comparison of the results from HST observation with the results from IUE and Pioneer Venus will be presented.
Esposito W. L. W. L.
Na Chan Y.
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