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X-ray emission from comets.

T E Cravens1

  • 1University of Kansas, Department of Physics and Astronomy, Malott Hall, Lawrence, KS 66045, USA. cravens@ukans.edu

Science (New York, N.Y.)
|May 11, 2002
PubMed
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X-ray emissions from comets like Hyakutake were unexpected. Scientists now understand this is due to solar wind ions colliding with comet gases, revealing insights into solar wind dynamics.

Area of Science:

  • * Planetary Science
  • * Astrophysics
  • * Space Physics

Background:

  • * Comets were previously considered too cold to emit X-rays.
  • * X-ray emissions have been observed from nearly all comets studied.
  • * The Röntgen Satellite (ROSAT) provided key observational data.

Purpose of the Study:

  • * To explain the source of unexpected X-ray emissions from comets.
  • * To investigate the role of solar wind interactions with cometary environments.
  • * To utilize cometary X-ray observations for solar wind studies.

Main Methods:

  • * Analysis of X-ray satellite observations (e.g., ROSAT).
  • * Theoretical modeling of physical processes in cometary comae.
  • * Investigating charge-exchange collisions between solar wind ions and cometary neutrals.

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Main Results:

  • * Charge-exchange collisions are confirmed as the primary mechanism for cometary X-ray production.
  • * This process involves highly charged solar wind ions interacting with neutral species in the comet's coma.
  • * X-ray emission is a common phenomenon across diverse comets.

Conclusions:

  • * Cometary X-ray emission provides a valuable tool for understanding solar wind properties.
  • * The interaction mechanism explains X-ray observations from comets and other solar system bodies.
  • * Further X-ray observations can map solar wind structure and dynamics.