Journal ArticleDOI
Discovery of hotspots on Io using disk-resolved infrared imaging
John R. Spencer,Mark A. Shure,M. E. Ressler,Jay D. Goguen,W. M. Sinton,D. Toomey,A. Denault,J. Westfall +7 more
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TLDR
In this article, an IR array camera was used to obtain direct IR images of Io with resolution better than 0.5 arcsec, so that more than one hotspot is seen on Io in Jupiter eclipse.Abstract:
First results are presented using two new techniques for ground-based observation of Io's hotspots. An IR array camera was used to obtain direct IR images of Io with resolution better than 0.5 arcsec, so that more than one hotspot is seen on Io in Jupiter eclipse. The camera was also used to make the first observations of the Jupiter occultation of the hotspots. These new techniques have revealed and located at least three hotspots and will now permit routine ground-based monitoring of the locations, temperatures, and sizes of multiple hotspots on Io.read more
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Io's heat flow from infrared radiometry: 1983–1993
TL;DR: In this paper, the authors report the following results from a decade of infrared radiometry of Io: (1) the average global heat flow is more than approx. 2.5 W/sq.m, large warm (less than or equal to 200 K) volcanic regions dominate the global heat flows, smal high-temperature (greater than or = 300 K) 'hotspots' contribute little to the average heat flow, thermal anomalies on the leading hemisphere contribute about half of the heat flow and a substantial amount of heat is radiated during Io's night, high
Journal ArticleDOI
Active Volcanism on Io as Seen by Galileo SSI
Alfred S. McEwen,Laszlo P. Keszthelyi,Paul Geissler,Damon P. Simonelli,Michael H. Carr,Torrence V. Johnson,Kenneth P. Klaasen,H. Herbert Breneman,Todd J. Jones,James M. Kaufman,K. Magee,David A. Senske,M. J. S. Belton,Gerald Schubert +13 more
TL;DR: Io has been monitored during the nominal Galileo satellite tour from mid 1996 through late 1997 by the Solid State Imaging (SSI) experiment, which was able to observe many manifestations of active volcanism, including changes in the color and albedo of the surface, active airborne plumes, and glowing vents seen in eclipse as discussed by the authors.
Journal ArticleDOI
Io on the eve of the galileo mission
TL;DR: Io, the innermost of Jupiter's large moons, is one of the most unusual objects in the Solar System as discussed by the authors, which produces a global heat flux 40 times the terrestrial value, producing intense volcanic activity and a global resurfacing rate averaging perhaps 1 cm yr−1.
The helium abundance of Jupiter from Voyager
TL;DR: The helium abundance in the Jovian atmosphere was derived from Voyager 1 data by two methods as discussed by the authors, one using only infrared spectra from selected locations on the planet while the second method using a thermal profile independently derived from radio occultation measurements and infrared spectrum recorded near the occultation point.
Journal ArticleDOI
Loki, Io: A periodic volcano
Julie A. Rathbun,Julie A. Rathbun,John R. Spencer,A. G. Davies,Robert R. Howell,Lionel Wilson +5 more
TL;DR: In this paper, a simple lava cooling model was applied to temperatures in Loki Patera, and eruption start and end times, and it was shown that brightenings are due to a resurfacing wave propagating across the patera.
References
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Satellites of Jupiter
TL;DR: In this article, the authors describe the geology of Ganymede, E.M.Shoemaker and R.F.Schaber volcanic eruption plumes on Lo, G.C.Sinton Lo's surface - its phase composition and influence on Lo's atmosphere and Jupiter's magnetosphere, F.Fanale et al.
Journal ArticleDOI
The atmosphere of Jupiter: An analysis of the Voyager radio occultation measurements
G. F. Lindal,G. E. Wood,G. S. Levy,John D. Anderson,D. N. Sweetnam,Henry B. Hotz,B. J. Buckles,D. P. Holmes,P. E. Doms,Von R. Eshleman,G. L. Tyler,T. A. Croft +11 more
TL;DR: In this article, the authors used S (2.3 GHz) and X band (8.4 GHz) signals transmitted from Voyager 1 and 2 to probe the Jovian atmosphere during occultations of the spacecraft by Jupiter.
Journal ArticleDOI
Absolute calibration of photometry at 1 through 5 microns
TL;DR: In this article, the solar-analog method was used to determine the absolute calibration of photometry in the J, H, K, L, and M bands to an accuracy of 3 percent, (5 percent at M).
Journal ArticleDOI
The helium abundance of Jupiter from Voyager
D. Gautier,Barney J. Conrath,M. Flasar,Rudolf A. Hanel,Virgil G. Kunde,Alain Chédin,N. Scott +6 more
TL;DR: The helium abundance in the Jovian atmosphere was derived from Voyager 1 data by two methods as discussed by the authors, one using only infrared spectra from selected locations on the planet while the second method using a thermal profile independently derived from radio occultation measurements and infrared spectrum recorded near the occultation point.
The helium abundance of Jupiter from Voyager
TL;DR: The helium abundance in the Jovian atmosphere was derived from Voyager 1 data by two methods as discussed by the authors, one using only infrared spectra from selected locations on the planet while the second method using a thermal profile independently derived from radio occultation measurements and infrared spectrum recorded near the occultation point.