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The Shadow of Comet Hale-Bopp in Lyman-Alpha

An Absolute Measurement of H Production Rate with SOHO/SWAN
  • Rosine Lallement
  • Jean-Loup Bertaux
  • Karöly Szegö
  • Szilvia Nemeth
Conference paper

Abstract

For a few months around perihelion, the central part of the Hale-Bopp hydrogen cloud has been optically thick to the solar Lyα radiation, and has significantly reduced the solar flux available for the resonance glow of interstellar hydrogen beyond the comet. This shadowing effect on the interstellar gas is the first ever observed comet shadow. It is modeled and compared with SWAN observations. Shadow modelling will help to constrain the comet water production and radiative transfer effects in the interstellar ionisation cavity.

Keywords

Comets interstellar medium solar system 

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References

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Copyright information

© Springer Science+Business Media Dordrecht 2002

Authors and Affiliations

  • Rosine Lallement
    • 1
  • Jean-Loup Bertaux
    • 1
  • Karöly Szegö
    • 2
  • Szilvia Nemeth
    • 2
  1. 1.Service d’Aéronomie du CNRSVerrieres-le-BuissonFrance
  2. 2.KFKI Research Institute for Particles and Nuclear PhysicsBudapestHungary

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