Space Science Reviews

, Volume 17, Issue 5, pp 645–654 | Cite as

The sun in the far infrared and sub-mm region

  • C. De Jager
Part I/Principles and Observational Purposes


A review is given of the solar radiation between wavelengths of approx. 5 μm. and 1 mm. After discussing the astrophysical background (Section 2), we review the brightness temperatures measured in the continuous spectrum in the disk center (Section 3), and compare them with model predictions. The observed limb darkening (or brightening) is described in Section 4, and the line spectrum in Section 5. In Section 6 considerations are given on the usefulness of infrared observations for the investigation of small structures on the Sun.


Radiation Model Prediction Solar Radiation Continuous Spectrum Brightness Temperature 
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Copyright information

© D. Reidel Publishing Company 1975

Authors and Affiliations

  • C. De Jager
    • 1
  1. 1.The Astronomical Institute at UtrechtThe Netherlands

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