Solar Physics

, Volume 90, Issue 1, pp 177–184 | Cite as

Stability of the photometric observations of the solar corona and variations of its intensity in the solar cycle 21

  • M. N. Gnevyshev
  • V. P. Mikhailutsa
Article
Revised:

Abstract

A comparison of the measurements of the intensity of the coronal line 5303 Å at the observations at Norikura, Kislovodsk and Lomnický Štít is used to determine the stability of photometric systems and cancel the effect of its variations. The intensity variations of the solar corona during the 21st solar cycle are plotted. It is confirmed that the 11-year solar cycle consists of two maxima of activity; the first one is characterized by a simultaneous enhancement of activity at all latitudes and the second one shows up only in the equatorial zone.

Keywords

Solar Cycle Intensity Variation Solar Corona Photometric Observation Equatorial Zone 
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References

  1. Gnevyshev, M. N.: 1963, Astron. Zh. 40, 401.Google Scholar
  2. Gnevyshev, M. N.: 1966, Soviet Phys. Uspekhi 90, 291.Google Scholar
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  5. Letfus, V. and Sýkora, J.: 1982, Atlas of the Green Corona Synoptic Charts for the Period 1947–1976, Bratislava, p. 9.Google Scholar

Copyright information

© D. Reidel Publishing Company 1984

Authors and Affiliations

  • M. N. Gnevyshev
    • 1
  • V. P. Mikhailutsa
    • 1
  1. 1.Kislovodsk Station of the Pulkovo ObservatoryKislovodskU.S.S.R.

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