Skip to main content
SpringerLink
Log in

Pre- and post-flare X-ray variations in active regions

  • Published:
Solar Physics Aims and scope Submit manuscript

Abstract

Extremely low background noise of the HXIS experiment aboard the SMM made it possible to detect > 3.5 keV X-ray emissions from non-flaring active regions which are 103–104 times weaker than the X-ray flux from flares. Short-lived X-ray bursts and long-lived X-ray enhancements of various intensities seem to characterize active regions in different phases of their development. After major two-ribbon flares, giant X-ray arches are seen in the corona, slowly decaying for many hours after the flare end. Associated with these arches appear to be quasi-periodic flare-like variations of purely coronal nature.

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

  • Anzer, U. and Pneuman, G.W.: 1982, Solar Phys. 79, 129.

    Google Scholar 

  • Kopp, R.A. and Pneuman, G.W.: 1976, Solar Phys. 50, 85.

    Google Scholar 

  • Nolte, J.T., Gerassimenko, M., Krieger, A.S., Petrasso, R.D. and Svestka, Z.: 1979, Solar Phys. 62, 123.

    Google Scholar 

  • Svestka, Z., Stewart, R.T., Hoyng, P., van Tend, W., Acton, L.W., Gabriel, A.H., Rapley, C.G. and 8 co-authors: 1982a, Solar Phys. 75, 305.

    Google Scholar 

  • Svestka, Z., Dennis, B.R., Pick, M., Raoult, A., Rapley, C.G., Stewart, R.T. and Woodgate, B.E.: 1982b, Solar Phys. 80, 143.

    Google Scholar 

  • Svestka, Z., Schrijver, J., Somov, B., Dennis, B.R., Woodgate, B.E., Fürst, E., Hirth, W., Klein, L. and Raoult, A.: 1983, Solar Phys., in press.

  • Zirin, H. and Tanaka, K.: 1973, Solar Phys. 32, 173.

    Google Scholar 

Download references

Author information

Authors and Affiliations

  1. Space Research Laboratory of the Astronomical Institute, Beneluxlaan 21, 3527 HS, Utrecht, The Netherlands

    Zdenek Svestka & Aert Schadee

  2. Center for Astrophysics and Space Science University of California San Diego, 92093, La Jolla, CA, U.S.A.

    Zdenek Svestka

Authors
  1. Zdenek Svestka
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. Aert Schadee
    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

Svestka, Z., Schadee, A. Pre- and post-flare X-ray variations in active regions. Sol Phys 86, 267–277 (1983). https://doi.org/10.1007/BF00157200

Download citation

  • Issue Date:

  • DOI: https://doi.org/10.1007/BF00157200

Keywords

Search

Navigation