Skip to main content
SpringerLink
Log in

Fractal dimensions of the time variation of solar radio emission

  • Published:
Solar Physics Aims and scope Submit manuscript

Abstract

The fractal dimensions of solar radio fluxes at 245, 410, 610, 1415, 2695, 2800, 4995, 8800, and 15400 MHz are calculated for the data period 1976–1990. The fractal dimension used here is an index to quantify the time variability of radio emission. The fractal dimensions were found to have values in the range of 1.2–2.0 for time scales of ≤ 10 days, 1–10 months, and ≥ 10 months. The lowest values were found around 3 GHz. The annual variations of fractal dimensions are small and are not in concert with the solar cycle for most of the fractal dimension at the analyzed frequencies except those for 4995 and 8800 MHz. The annual variations of the fractal dimensions are similar for the sunspot number and radio emission around 3 GHz; this implies a close relation between them. According to a simulation, larger fractal dimensions correspond to shorter e-folding time constants in the distribution of radio-source lifetimes.

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

  • Aschwanden, M. J. and Bastian, T. S.: 1994, Astrophys. J. 426, 434.

    Google Scholar 

  • El-Raey, M. and Scherrer, P.: 1973, Solar Phys. 30, 149.

    Google Scholar 

  • Gupta, M. K. and Sarkar, S. K.: 1971, Solar Phys. 18, 276.

    Google Scholar 

  • Higuchi, T.: 1988, Physica D31, 277.

    Google Scholar 

  • Kundu, M. R.: 1965, Solar Radio Astronomy, John Wiley and Sons, New York, p. 104.

    Google Scholar 

  • Lawrence, J. K.: 1991, Solar Phys. 135, 249.

    Google Scholar 

  • Lawrence, J. K. and Schrijver, C. J.: 1993, Astrophys. J. 411, 402.

    Google Scholar 

  • Schmahl, E. J. and Kundo, M. R. 1995, J. Geophys. Res. (in press).

  • Sheridan, K. V. and McLean, D. J.: 1985, in D. J. McLean, and N. R. Labrum (eds.), Solar Radiophysics, Cambridge University Press, Cambridge, p. 443.

    Google Scholar 

  • Solar-Geophysical Data: 1976–1991, Part I, No. 378–557, NOAA/National Geophysical Data Center, Boulder, Colorado, U.S.A.

  • Zheleznyakov, V. V.: 1970, Radio Emission of the Sun and Planets, Pergamon Press, London.

    Google Scholar 

Download references

Author information

Authors and Affiliations

  1. Communications Research Laboratory, 4-2-1 Nukuikita, Koganei, 184, Tokyo, Japan

    Shinichi Watari

Authors
  1. Shinichi Watari
    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

Watari, S. Fractal dimensions of the time variation of solar radio emission. Sol Phys 163, 371–381 (1996). https://doi.org/10.1007/BF00148008

Download citation

  • Received:

  • Revised:

  • Issue Date:

  • DOI: https://doi.org/10.1007/BF00148008

Keywords

Search

Navigation