The Shadow of Comet Hale–Bopp in Lyman-Alpha

@article{Lallement2002TheSO,
  title={The Shadow of Comet Hale–Bopp in Lyman-Alpha},
  author={R. Lallement and J L Bertaux and K{\'a}roly Szeg{\"o} and Szilvia Nemeth},
  journal={Earth, Moon, and Planets},
  year={2002},
  volume={90},
  pages={67-76}
}
For a few months around perihelion, thecentral part of the Hale–Bopp hydrogencloud has been optically thick to thesolar Lyα radiation, and hassignificantly reduced the solar flux availablefor the resonance glow of interstellarhydrogen beyond the comet. This shadowing effecton the interstellar gas is the first everobserved comet shadow. It is modeled andcompared with SWAN observations. Shadowmodelling will help to constrain the cometwater production and radiative transfer effectsin the… 

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