Calculated occultation profiles of Io and the hot spots

Alfred S. McEwen; Laurence A. Soderblom; Dennis L. Matson; Torrence V. Johnson; Jonathan I. Lunine

doi:10.1029/GL013i003p00201

Calculated occultation profiles of Io and the hot spots

Alfred S. McEwen, Laurence A. Soderblom, Dennis L. Matson, Torrence V. Johnson, Jonathan I. Lunine

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

Occultations of Io by other Galilean satellites in 1985 provide a means to locate volcanic hot spots and to model their temperatures. We have computed the expected time variations in the integral reflected and emitted radiation of the occultations as a function of wavelength (visual to 8.7µm). The best current ephemerides were used to calculate the geometry of each event as viewed from Earth. Visual reflectances were modeled from global mosaics of Io. Thermal emission from the hot spots was calculated from Voyager 1 IRIS observations and, for regions unobserved by IRIS, from a model based on the distribution of low‐albedo features. The occultations may help determine (1) the location and temperature distribution of Loki; (2) the source(s) of excess emission in the region from long 50° to 200°; and (3) the distribution of small, high‐temperature sources.

Original language	English (US)
Pages (from-to)	201-204
Number of pages	4
Journal	Geophysical Research Letters
Volume	13
Issue number	3
DOIs	https://doi.org/10.1029/GL013i003p00201
State	Published - Mar 1986
Externally published	Yes

ASJC Scopus subject areas

Geophysics
General Earth and Planetary Sciences

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10.1029/GL013i003p00201

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title = "Calculated occultation profiles of Io and the hot spots",

abstract = "Occultations of Io by other Galilean satellites in 1985 provide a means to locate volcanic hot spots and to model their temperatures. We have computed the expected time variations in the integral reflected and emitted radiation of the occultations as a function of wavelength (visual to 8.7µm). The best current ephemerides were used to calculate the geometry of each event as viewed from Earth. Visual reflectances were modeled from global mosaics of Io. Thermal emission from the hot spots was calculated from Voyager 1 IRIS observations and, for regions unobserved by IRIS, from a model based on the distribution of low‐albedo features. The occultations may help determine (1) the location and temperature distribution of Loki; (2) the source(s) of excess emission in the region from long 50° to 200°; and (3) the distribution of small, high‐temperature sources.",

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T1 - Calculated occultation profiles of Io and the hot spots

AU - McEwen, Alfred S.

AU - Soderblom, Laurence A.

AU - Matson, Dennis L.

AU - Johnson, Torrence V.

AU - Lunine, Jonathan I.

PY - 1986/3

Y1 - 1986/3

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AB - Occultations of Io by other Galilean satellites in 1985 provide a means to locate volcanic hot spots and to model their temperatures. We have computed the expected time variations in the integral reflected and emitted radiation of the occultations as a function of wavelength (visual to 8.7µm). The best current ephemerides were used to calculate the geometry of each event as viewed from Earth. Visual reflectances were modeled from global mosaics of Io. Thermal emission from the hot spots was calculated from Voyager 1 IRIS observations and, for regions unobserved by IRIS, from a model based on the distribution of low‐albedo features. The occultations may help determine (1) the location and temperature distribution of Loki; (2) the source(s) of excess emission in the region from long 50° to 200°; and (3) the distribution of small, high‐temperature sources.

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Calculated occultation profiles of Io and the hot spots

Abstract

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