Skip to main content
SpringerLink
Log in

Solar flares in the extreme ultraviolet

  • Published:
Solar Physics Aims and scope Submit manuscript

Abstract

Measurements of flare-related impulsive enhancements in solar emission lines in the extreme ultraviolet, observed from the satellite OSO-III, are reported. The enhancement of a line, expressed in percent of the total disk intensity in the line, is of the same order of magnitude as the flare area, expressed in heliocentric square degrees. Rise-times and decay-times of impulsive enhancements average about 2 min and 5 min, respectively. The maximum enhancements of radiation from ions in the chromosphere-corona transition region precede the Hα maximum by an average of 2 min, and occur in the same period of time as the hard component of solar X-rays and the impulsive microwave bursts. Coronal lines in the extreme ultraviolet are less impulsive than the transition region lines in flare-related enhancements and their maxima follow the Hα maximum.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

References

  • Athay, R. Grant: 1966, Astrophys. J. 145, 784.

    Google Scholar 

  • Castelli, J. P. and Richards, D. W.: 1971, in preparation.

  • Cox, Donald P. and Tucker, Wallace H.: 1969, Astrophys. J. 157, 1157.

    Google Scholar 

  • Donnelly, R. F.: 1967, J. Geophys. Res. 72, 5247.

    Google Scholar 

  • Donnelly, R. F.: 1969, J. Geophys. Res. 74, 1873.

    Google Scholar 

  • Donnelly, R. F.: 1970, ESSA Tech. Report ERL 169-SDL14, U.S. Govt. Printing Office, Washington.

    Google Scholar 

  • Dupree, Andrea K. and Goldberg, Leo: 1967, Solar Phys. 1, 229.

    Google Scholar 

  • Hall, L. A. and Hinteregger, H. E.: 1969, in C. de Jager and Z. Švestka (eds.), ‘Solar Flares and Space Research’, COSPAR Symp., 81.

  • Hall, L. A. and Hinteregger, H. E.: 1970, J. Geophys. Res. 75, 6959.

    Google Scholar 

  • Hinteregger, H. E. and Hall, L. A.: 1969, Solar Phys. 6, 175.

    Google Scholar 

  • Jordan, Carole: 1969, Monthly Notices Roy. Astron. Soc. 142, 499.

    Google Scholar 

  • Kane, S. R.: 1969, Astrophys. J. 157, L139.

    Google Scholar 

  • Kane, S. R. and Donnelly, R. F.: 1971, Astrophys. J. 164, 151.

    Google Scholar 

  • Kundu, M. R.: 1965, Solar Radio Astronomy, Interscience Pub., New York.

    Google Scholar 

  • Munro, Richard H., Dupree, A. K., and Withbroe, George L.: 1971, Solar Satellite Project, Harvard College Observatory, TR-23.

  • Neupert, W. M.: 1969, Ann. Rev. Astron. Astrophys. 7, 121.

    Google Scholar 

  • Sawyer, Constance B.: 1967, Astrophys. J. 147, 193.

    Google Scholar 

  • Solar-Geophysical Data: 1967, ESSA, Boulder, Colo., U.S.A.

Download references

Author information

Authors and Affiliations

  1. Air Force Cambridge Research Laboratories, Bedford, Mass., U.S.A.

    L. A. Hall

Authors
  1. L. A. Hall
    View author publications

    You can also search for this author in PubMed Google Scholar

Rights and permissions

Reprints and permissions

About this article

Cite this article

Hall, L.A. Solar flares in the extreme ultraviolet. Sol Phys 21, 167–175 (1971). https://doi.org/10.1007/BF00155787

Download citation

  • Received:

  • Issue Date:

  • DOI: https://doi.org/10.1007/BF00155787

Keywords

Search

Navigation