ULTRAVIOLET SPECTROMETER OBSERVATIONS OF URANUS.

A. L. Broadfoot, F. Herbert, J. B. Holberg, D. M. Hunten, S. Kumar, B. R. Sandel, D. E. Shemansky, G. R. Smith, Roger Yelle, D. F. Strobel, H. W. Moos, T. M. Donahue, S. K. Atreya, J. L. Bertaux, J. E. Blamont

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Abstract

Data from solar and stellar occulations of Uranus indicate a temperature of about 750 kelvins in the upper levels of the atmosphere (composed mostly of atomic and molecular hydrogen) and define the distributions of methane and acetylene in the lower levels. The ultraviolet spectrum of the sunlit hemisphere is dominated by emissions from atomic and molecular hydrogen, which are known as electroglow emissions. The high temperature of the atmosphere, the small size of Uranus, and the number density of hydrogen atoms in the thermosphere imply an extensive thermal hydrogen corona that reduces the orbital lifetime of ring particles and biases the size distribution toward larger particles. An initial estimate of the acetylene volume mixing ratios, as judged from measurements of the far ultraviolet albedo, is about 2 multiplied by 10** minus **7 at a vertical column abundance of molecular hydrogen of 10**2**3 per sq. cm.

Original languageEnglish (US)
Pages (from-to)74-79
Number of pages6
JournalScience
Volume233
Issue number4759
StatePublished - Jul 4 1986

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Uranus
spectrometer
hydrogen
acetylene
atmosphere
thermosphere
mixing ratio
corona
albedo
methane
temperature

ASJC Scopus subject areas

  • General

Cite this

Broadfoot, A. L., Herbert, F., Holberg, J. B., Hunten, D. M., Kumar, S., Sandel, B. R., ... Blamont, J. E. (1986). ULTRAVIOLET SPECTROMETER OBSERVATIONS OF URANUS. Science, 233(4759), 74-79.

ULTRAVIOLET SPECTROMETER OBSERVATIONS OF URANUS. / Broadfoot, A. L.; Herbert, F.; Holberg, J. B.; Hunten, D. M.; Kumar, S.; Sandel, B. R.; Shemansky, D. E.; Smith, G. R.; Yelle, Roger; Strobel, D. F.; Moos, H. W.; Donahue, T. M.; Atreya, S. K.; Bertaux, J. L.; Blamont, J. E.

In: Science, Vol. 233, No. 4759, 04.07.1986, p. 74-79.

Research output: Contribution to journalArticle

Broadfoot, AL, Herbert, F, Holberg, JB, Hunten, DM, Kumar, S, Sandel, BR, Shemansky, DE, Smith, GR, Yelle, R, Strobel, DF, Moos, HW, Donahue, TM, Atreya, SK, Bertaux, JL & Blamont, JE 1986, 'ULTRAVIOLET SPECTROMETER OBSERVATIONS OF URANUS.', Science, vol. 233, no. 4759, pp. 74-79.
Broadfoot AL, Herbert F, Holberg JB, Hunten DM, Kumar S, Sandel BR et al. ULTRAVIOLET SPECTROMETER OBSERVATIONS OF URANUS. Science. 1986 Jul 4;233(4759):74-79.
Broadfoot, A. L. ; Herbert, F. ; Holberg, J. B. ; Hunten, D. M. ; Kumar, S. ; Sandel, B. R. ; Shemansky, D. E. ; Smith, G. R. ; Yelle, Roger ; Strobel, D. F. ; Moos, H. W. ; Donahue, T. M. ; Atreya, S. K. ; Bertaux, J. L. ; Blamont, J. E. / ULTRAVIOLET SPECTROMETER OBSERVATIONS OF URANUS. In: Science. 1986 ; Vol. 233, No. 4759. pp. 74-79.
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AU - Strobel, D. F.

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