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Water on the sun

L Wallace1, P Bernath, W Livingston

  • 1Kitt Peak National Observatory, National Optical Astronomy Observatories, Tucson, AZ 85726, USA.

Science (New York, N.Y.)
|May 26, 1995
PubMed
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Scientists analyzed infrared spectra from sunspot umbrae, identifying numerous solar water absorption lines. These lines correspond to hot water transitions, confirmed by laboratory spectra.

Area of Science:

  • Astronomy and Astrophysics
  • Spectroscopy
  • Atmospheric Science

Background:

  • Sunspot umbrae are regions of intense magnetic activity on the Sun's surface.
  • Understanding the composition of the solar atmosphere requires detailed spectral analysis.
  • Water vapor is a key molecule in various astrophysical environments.

Purpose of the Study:

  • To investigate the presence and transitions of water molecules in sunspot umbrae.
  • To identify specific water absorption features in high-resolution infrared solar spectra.
  • To characterize the nature of these water lines using laboratory data.

Main Methods:

  • Acquisition of high-resolution infrared spectra using a 1-meter Fourier transform spectrometer at Kitt Peak.
  • Analysis of solar spectra to detect absorption features.

Related Experiment Videos

  • Comparison of observed solar water lines with high-temperature laboratory emission spectra of water.

    • Main Results:

    • A significant number of water absorption features were detected in the sunspot umbrae spectra.
    • These features were successfully assigned to pure rotation and vibration-rotation transitions of hot water.
    • The assignments were validated by matching with laboratory-generated spectra of water at elevated temperatures.

    Conclusions:

    • The study confirms the presence of hot water molecules within sunspot umbrae.
    • High-resolution infrared spectroscopy is a powerful tool for identifying molecules in solar features.
    • The findings contribute to our understanding of the chemical and physical conditions in the solar atmosphere.