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Title:
Observations from earth orbit and variability of the polar aurora on Jupiter
Authors:
Clarke, J. T.; Moos, H. W.; Atreya, S. K.; Lane, A. L.
Affiliation:
AA(Johns Hopkins University, Baltimore, Md.), AB(Johns Hopkins University, Baltimore, Md.), AC(Michigan, University, Ann Arbor, Mich.), AD(California Institute of Technology, Jet Propulsion Laboratory, Pasadena, Calif.)
Publication:
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 241, Nov. 1, 1980, p. L179-L182. (ApJ Homepage)
Publication Date:
11/1980
Category:
Lunar and Planetary Exploration
Origin:
STI
NASA/STI Keywords:
AURORAL SPECTROSCOPY, JUPITER ATMOSPHERE, PLANETARY MAGNETIC FIELDS, POLAR REGIONS, SPACEBORNE ASTRONOMY, EARTH ORBITS, EXPLORER SATELLITES, H ALPHA LINE, PLANETARY MAGNETOSPHERES, ULTRAVIOLET ASTRONOMY
Comment:
A&AA ID. AAA028.099.136
DOI:
10.1086/183386
Bibliographic Code:
1980ApJ...241L.179C

Abstract

Spatially resolved spectra of Jupiter taken with the International Ultraviolet Explorer satellite show enhanced emissions from the polar regions at H L-alpha (1216 A) and in the Lyman and Werner bands of H2 (1175-1650 A). Two types of variability in emission brightness have been observed in these aurorae: an increase in the observed emission as the auroral oval rotates with Jupiter's magnetic pole to face toward the earth and a general variation in brightness of more than an order of magnitude under nearly identical observing conditions. In addition, the spectral character of these aurorae (determined by the ratio of H L-alpha to H2 brightnesses) appears variable, indicating that the depth of penetration of the auroral particles is not constant.

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