Activity of Comet Halley Observed in the Ultraviolet

  1. Thomas J. Birmingham and
  2. Alexander J. Dessler
  1. E. Kaneda1,
  2. K. Hirao2,
  3. M. Shimizu3 and
  4. O. Ashihara3

Published Online: 19 MAR 2013

DOI: 10.1029/SP027p0297

Comet Encounters

Comet Encounters

How to Cite

Kaneda, E., Hirao, K., Shimizu, M. and Ashihara, O. (1988) Activity of Comet Halley Observed in the Ultraviolet, in Comet Encounters (eds T. J. Birmingham and A. J. Dessler), American Geophysical Union, Washington, D.C.. doi: 10.1029/SP027p0297

Author Information

  1. 1

    Geophysics Research Laboratory, University of Tokyo, Hongo, Bunkyo-Ku, Tokyo 113, Japan

  2. 2

    Department of Aeronautics and Astronautics, Tokai University, 1117, Kita-Kaname, Hiratsuka-Shi 259-12, Japan

  3. 3

    Institute of Space and Astronautical Science, Komaba, Meguro-Ku, Tokyo 153, Japan

Publication History

  1. Published Online: 19 MAR 2013
  2. Published Print: 1 JAN 1988

ISBN Information

Print ISBN: 9780875902395

Online ISBN: 9781118668757

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Keywords:

  • Charge coupled device (CCD);
  • Comet Halley;
  • Hydrogen density;
  • Lyman alpha images;
  • Ultraviolet imager (UVI)

Summary

The time variation of the water production rate of cornet Halley during this apparition has been deduced from observations of the ultraviolet Imager on board Suisei. The preperihelion production rates were a factor of 2 ∼ 3 smaller than postperihelion rates, suggesting a postperihelion heating of the cometary nucleus. Some fine intensity structure in the Lyman alpha photometry data taken at encounter, which indicates spatial variation of the atomic hydrogen density in the coma, may correspond to shell structures in the Lyman alpha images so far obtained and is ascribed to the presence of a hydrogen source other than water in the cometary gas or dust particles. The velocity of these hydrogen atoms is estimated to be about 11 km s−1.