Skip to main content
SpringerLink
Log in

A high resolution spectral analysis of daily relative sunspot number and 10·7 cm. Solar flux

  • Published:
Proceedings of the Indian Academy of Sciences - Section A Aims and scope Submit manuscript

Abstract

Auto and cross-spectra of relative sunspot number and slowly varying component of solar radiation at 10·7 cm. have been computed for a 52-month period beginning September 1, 1958. Significant features of the spectra are relatively high variance at periods corresponding to one, three and four solar rotations. Statistically significant spectral peaks have been observed at three other frequencies and are ascribed to amplitude modulation of the 27-day component. The cross-spectral analysis indicates that during the period under investigation the solar 10·7 cm. flux leads the sunspot number for periods in excess of about 27·7 days; for shorter periods the flux lags behind the sunspot number. The coherence between the two time series, after an initial decrease from unity at zero frequency, assumes a maximum value of 0·985 at 27·7 days. The phase and coherence indicate that long-lived radio emission regions and spots appeared to co-rotate during 1958–62 with a period of 27·7 days.

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

  1. Blackman, R. B. and Tukey, J. W.The Measurement of Power Spectra from the Point of View of Communications Engineering, Dover Publications, New York, 1958.

    Google Scholar 

  2. Ward, F. and Shapiro, R.J. Geophys. Res., 1962,67, 541.

    Article  MathSciNet  Google Scholar 

  3. Munk, W., Snodgrass, F. E. and Tucker, N. J.Bulletin of the Scripps Institution of Oceanography of the University of California, 1959,7, 283.

    Google Scholar 

  4. Tukey, J. W...Symposium on “Applications of Autocorrelation Analysis to Physical Problem,” Washington, Office of Naval Research, 1949, 47.

    Google Scholar 

  5. Coleman, P. J. and Smith, E. J.J. Geophys. Res., 1966,71, 4685.

    Google Scholar 

  6. Altschuler, M. D. and Sastry, Ch. V.Nature, 1965,206, 1035.

    Article  Google Scholar 

Download references

Author information

Authors and Affiliations

  1. Colaba Observatory, Bombay-5

    B. N. Bhargava

Authors
  1. B. N. Bhargava
    View author publications

    You can also search for this author in PubMed Google Scholar

Additional information

Communicated by Dr. M. K. Vainu Bappu,f.a.sc.

Rights and permissions

Reprints and permissions

About this article

Cite this article

Bhargava, B.N. A high resolution spectral analysis of daily relative sunspot number and 10·7 cm. Solar flux. Proc. Indian Acad. Sci. 68, 265–272 (1968). https://doi.org/10.1007/BF03046432

Download citation

  • Received:

  • Issue Date:

  • DOI: https://doi.org/10.1007/BF03046432

Keywords

Search

Navigation