Interception of comet Hyakutake's ion tail at a distance of 500 million kilometres

@article{Gloeckler2000InterceptionOC,
  title={Interception of comet Hyakutake's ion tail at a distance of 500 million kilometres},
  author={George Gloeckler and Johannes Geiss and Nathan A. Schwadron and Lennard A. Fisk and Thomas H. Zurbuchen and Fred M. Ipavich and Rudolf von Steiger and Hans Balsiger and Berend Wilken},
  journal={Nature},
  year={2000},
  volume={404},
  pages={576-578}
}
Remote sensing observations and the direct sampling of material from a few comets have established the characteristic composition of cometary gas. This gas is ionized by solar ultraviolet radiation and the solar wind to form ‘pick-up’ ions, ions in a low ionization state that retain the same compositional signatures as the original gas. The pick-up ions are carried outward by the solar wind, and they could in principle be detected far from the coma. (Sampling of pick-up ions has also been used… Expand
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Identification of comet Hyakutake's extremely long ion tail from magnetic field signatures
TLDR
The authors' measurements reveal that, at this distance, the tail of comet Hyakutake was a structured entity at least 7 million kilometres in diameter, which surpasses the tail length of 2 au determined for the Great March Comet of 1843. Expand
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