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Solar flares in the extreme ultraviolet

1. The observations

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Abstract

Solar-flare observations in the extreme ultraviolet (300–1350 Å) are reported. Some 269 flares observed by the Harvard College Observatory (HCO) experiment on OSO 4 and 211 flares observed by the HCO experiment on OSO 6 have been analyzed. The flares were observed in spectral lines and continua emitted by many ionic species over a temperature range from 104 to 3.5 × 106 K. The EUV data have been correlated with X-ray, Hα, and radio observations, and a significant number of EUV bursts not associated with reported Hα, X-ray, or radio bursts have been iden tified and investigated. The results indicate that these latter EUV events are less energetic by about a factor of 2 than EUV bursts associated with — F subflares.

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Author notes

  1. A. T. Wood Jr.

    Present address: Physics Department, St. Bonaventure University, St. Bonaventure, New York, U.S.A.

Authors and Affiliations

  1. Harvard College Observatory, Cambridge, Mass., U.S.A.

    A. T. Wood Jr.

  2. Smithsonian Astrophysical Observatory and Harvard College Observatory, Cambridge, Mass., U.S.A.

    R. W. Noyes

  3. Harvard College Observatory, Cambridge, Mass., U.S.A.

    A. K. Dupree, M. C. E. Huber, W. H. Parkinson, E. M. Reeves & G. L. Withbroe

Authors
  1. A. T. Wood Jr.
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  2. R. W. Noyes
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  3. A. K. Dupree
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  4. M. C. E. Huber
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  5. W. H. Parkinson
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  6. E. M. Reeves
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  7. G. L. Withbroe
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Wood, A.T., Noyes, R.W., Dupree, A.K. et al. Solar flares in the extreme ultraviolet. Sol Phys 24, 169–179 (1972). https://doi.org/10.1007/BF00231094

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  • DOI: https://doi.org/10.1007/BF00231094

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