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SO 2Distributions on Io
McGrath, Melissa A.; Belton, Michael J. S.; Sartoretti, Paola
We present an analysis of disk-resolved images of Io at 232.5, 260, and 285 nm taken with the FOC (Faint Object Camera) of the Hubble Space Telescope. The images at 232.5 and 260 nm were acquired in 1993 in an effort to separate the surface and SO2atmosphere contributions to the observed UV albedo. We combine these images to make UV col…
Jovian Tropospheric Features—Wind Field, Morphology, and Motion of Long-Lived Systems
Simon, Amy A.; Beebe, Reta F.
A map spanning 360° of longitude and +5° to -65° latitude has been constructed from Hubble Space Telescope SL-9 Campaign F410M images obtained on July 23, 1994 with the WFPC2 in PC and WF mode. For comparison, a map spanning +65° to -65° has been generated from WFPC2 PC observations on February 17, 1995. Because the WFPC2 data has the highest spat…
Ultraviolet Spectroscopy of the SL9 Impact Sites. I. The 175-230 nm Region
McGrath, Melissa A.; Yelle, Roger V.
We present a comprehensive analysis of spectra in the 175-230 nm wavelength region obtained by the Faint Object Spectrograph of the Hubble Space Telescope (HST) to determine the abundance of molecular species in the vicinity of the G and L impact sites. Data were obtained on July 18, roughly 3 hr after the G impact, on August 9, and on August 23. …
Observations of Comet P/Faye 1991 XXI with the Planetary Camera of the Hubble Space Telescope
Lamy, P. L.; Keller, H. U.; Toth, I. +3 more
Comet P/Faye 1991 XXI (1991 n) was observed with the planetary camera (PC) of the Hubble Space Telescope (HST) between October 29 and November 21, 1991, when its geocentric distance was in the range 0.62-0.67 AU. The resulting high resolution-a single PC pixel projected to a distance of ∼20 km at the comet-made it possible to clearly discriminate …
Absolute Reflectivity Spectra of Jupiter: 0.25--3.5 Micrometers
Baines, K. H.; Nicholson, P. D.; Simon, A. A. +6 more
The world-wide observing campaign of the Comet P/Shoemaker-Levy 9 (SL9) impacts into Jupiter during July 1994 has led to an unprecedented quantity of imaging data, predominantly in the visible to near-infrared wavelength regime. In an effort to provide reference brightness values for Jupiter at all latitudes, we present a compilation of absolute r…
Analysis of Jovian Auroral H Ly-α Emission (1981-1991)
Ballester, Gilda E.; McGrath, Melissa A.; Clarke, John T. +1 more
We present a new analysis of jovian auroral IUE spectra covering the period from 1981 to 1991. To extract integrated auroral H Ly-α emission from these spectra we have developed a new extraction method that bins signal with wavelength while preserving the spatial information provided by the IUE imaging spectrograph. This separates auroral emission…
Seasonal Recession of Martian South Polar Cap: 1992 HST Observations
Clancy, R. Todd; James, Philip B.; Lee, Steven W. +2 more
The seasonal recession of the south polar cap of Mars has been studied using the Wide Field Planetary Camera images from Hubble Space Telescope obtained during the summer of 1992 when the angular size of Mars was between 5 and 6 arc sec. The observations cover the interesting period betweenLS= 259 and 284, when the recession is rapid an…
The Contribution of Asteroid Dust to the Interplanetary Dust Cloud: The Impact of ULYSSES Results on the Understanding of Dust Production in the Asteroid Belt and of the Formation of the IRAS Dust Bands
Mann, Ingrid; Grün, Eberhard; Wilck, Martin
Investigations of the zodiacal dust cloud give evidence for a significant contribution of asteroidal dust to the interplanetary dust cloud, a result which can now be compared to measurements of the ULYSSES dust detector during its passage of the asteroid belt. Especially we discuss the ULYSSES data with respect to the IRAS dust bands and consider …
The Structure of the Stratospheric Aerosol Layer in the Equatorial and South Polar Regions of Jupiter
Moreno, Fernando
A one-dimensional code to study the microphysical processes affecting aerosol particles in the jovian stratosphere and upper troposphere has been developed. The algorithms are based on those developed by Turcoet al.(Turco, R. P., P. Hamill, O. B. Toon, R. C. Whitten, and C. S. Kiang 1979.J. Atmos. Sci.36, 699-717) and include the effects of partic…
Comet Shoemaker-Levy 9 Dust
Mumma, Michael J.; Hahn, Joseph M.; Rettig, Terrence W.
Comet Shoemaker-Levy 9 (S-L 9) was imaged with the Hubble Space Telescope from January 1994, through solar opposition on April 29, and until impact in July 1994. As noted by several observers, no anti-sunward dust tails were detected east of the fragments after opposition (D. Jewitt and J. Chen 1994,Periodic Comet Shoemaker-Levy 9(1993e), IAU Circ…