Modelling X-ray line and continuum emission from comets

Martin Torney, R. Bingham, J. M. Dawson, B. J. Kellett, V. D. Shapiro, H. Summers

Research output: Contribution to journalArticle

Abstract

The comet C/LINEAR 1999 S4 was observed by the ACIS-S instrument on the Chandra X-ray Observatory (CXO) in July 2000, and the resultant spectrum was by far the clearest cometary X-ray spectrum to date. It is the aim of this paper to see if the spectrum can be reproduced directly from atomic data using the ADAS (the Atomic Data and Analysis Structure) system to try and reproduce the conditions of the comet's interaction with the solar wind. This is accomplished by calculating the atomic rate coefficients for a simplified cometary plasma over a range of likely temperatures and combining the resultant predicted emission line spectrum with a pure bremsstrahlung continuum. The outcome is a model spectrum which can be compared to that Chandra observation.
LanguageEnglish
Pages168-171
Number of pages4
JournalPhysica Scripta
VolumeT98
DOIs
Publication statusPublished - 2002

Fingerprint

comets
Continuum
continuums
Line
Modeling
x rays
data structures
bremsstrahlung
solar wind
line spectra
observatories
emission spectra
Observatory
Plasma
Likely
coefficients
Coefficient
Interaction
Range of data
interactions

Keywords

  • comet emission
  • atomic data
  • comet x-ray spectrum

Cite this

Torney, Martin ; Bingham, R. ; Dawson, J. M. ; Kellett, B. J. ; Shapiro, V. D. ; Summers, H. / Modelling X-ray line and continuum emission from comets. In: Physica Scripta. 2002 ; Vol. T98. pp. 168-171.
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Modelling X-ray line and continuum emission from comets. / Torney, Martin; Bingham, R.; Dawson, J. M.; Kellett, B. J.; Shapiro, V. D.; Summers, H.

In: Physica Scripta, Vol. T98, 2002, p. 168-171.

Research output: Contribution to journalArticle

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AU - Torney, Martin

AU - Bingham, R.

AU - Dawson, J. M.

AU - Kellett, B. J.

AU - Shapiro, V. D.

AU - Summers, H.

PY - 2002

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AB - The comet C/LINEAR 1999 S4 was observed by the ACIS-S instrument on the Chandra X-ray Observatory (CXO) in July 2000, and the resultant spectrum was by far the clearest cometary X-ray spectrum to date. It is the aim of this paper to see if the spectrum can be reproduced directly from atomic data using the ADAS (the Atomic Data and Analysis Structure) system to try and reproduce the conditions of the comet's interaction with the solar wind. This is accomplished by calculating the atomic rate coefficients for a simplified cometary plasma over a range of likely temperatures and combining the resultant predicted emission line spectrum with a pure bremsstrahlung continuum. The outcome is a model spectrum which can be compared to that Chandra observation.

KW - comet emission

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