Skip to main content
SpringerLink
Log in

Thermal and non-thermal soft X-ray bursts

  • Published:
Solar Physics Aims and scope Submit manuscript

Abstract

X-ray bursts observed for energies lower than 25 keV are usually interpreted as being produced by a thermal plasma with several million degrees of temperature.

A small number of events recorded at Arcetri by real time telemetry of SOLRAD 9 satellite agrees with a thermal interpretation and gives temperatures ranging between 10 × 106 and 30 × 106K and emission measures, ∫N 2e dV, between 1047 and 1048 cm−3.

An impulsive event recorded on January 7, 1969 shows an anomalous behaviour. In this case the emission has been attributed to bremsstrahlung radiation from electrons with a power law energy distribution dN = KE -γ dE. The values of the spectral index and of the emission measure are given.

A tentative interpretation of the event is suggested and the way to produce non-relativistic electrons with a power law energy distribution is investigated.

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

  • Anderson, D. A. and Winckler, J. R.: 1962, J. Geophys. Res. 67, 4103.

    Google Scholar 

  • Culhane, J. L. and Phillips, K. J. H.: 1970, Solar Phys. 11, 117.

    Google Scholar 

  • De Jager, C.: 1965, Ann. Astrophys. 28, 125.

    Google Scholar 

  • De Jager, C.: 1967, Solar Phys. 2, 347.

    Google Scholar 

  • Drake, J. F.: 1971, Solar Phys. 16, 152.

    Google Scholar 

  • Heitier, W.: 1954, Quantum Theory of Radiation, Oxford Press.

  • Holt, S. S. and Cline, T. L.: 1968, Astrophys. J. 154, 1027.

    Google Scholar 

  • Hudson, H. S., Peterson, L. E., and Schwartz, D. A.: 1969, Astrophys. J. 157, 389.

    Google Scholar 

  • Kahler, S. W., Meekins, J. F., Kreplin, R. W., and Bowyer, C. S.: 1970, Astrophys. J. 162, 293.

    Google Scholar 

  • Kane, S. R. and Anderson, K. A.: 1970, Astrophys. J. 162, 1003.

    Google Scholar 

  • Korchak, A. A.: 1967, Soviet Astron. AJ 11, 258.

    Google Scholar 

  • Korchak, A. A.: 1971, Solar Phys. 18, 284.

    Google Scholar 

  • Kreplin, R. W. and Horan, O. M.: 1969, NRL Report 6800.

  • Landini, M. and Monsignori Fossi, B. C.: 1970, Astron. Astrophys. 6, 468.

    Google Scholar 

  • Lin, R. P. and Hudson, A. S.: 1971, Solar Phys. 17, 412.

    Google Scholar 

  • Parker, E. N.: 1957, Phys. Rev. 107, 830.

    Google Scholar 

  • Peterson, L. E. and Winckler, J. R.: 1959, J. Geophys. Res. 64, 697.

    Google Scholar 

  • Spitzer, L., Jr.: 1962, Physics of Fully Ionized Gases, New York, Interscience Publ.

    Google Scholar 

  • Vainstein, L. A., Beigman, I. L, Mandel'shtam, S. L., Tindo, I. P., and Zhitnik, I. A.: 1970, Communication to International Symposium Solar Terrestrial Physics, Leningrad.

Download references

Author information

Authors and Affiliations

  1. Osservatorio Astrofisico di Arcetri, Firenze, Italy

    M. Landini, B. C. Monsignori Fossi & R. Pallavicini

Authors
  1. M. Landini
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. B. C. Monsignori Fossi
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. R. Pallavicini
    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

Landini, M., Monsignori Fossi, B.C. & Pallavicini, R. Thermal and non-thermal soft X-ray bursts. Sol Phys 27, 164–173 (1972). https://doi.org/10.1007/BF00151780

Download citation

  • Revised:

  • Issue Date:

  • DOI: https://doi.org/10.1007/BF00151780

Keywords

Search

Navigation