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Cyclic Variation in the Solar Lower Atmosphere

  • C. Fang (a1), Y. X. Zhang (a1), M. D. Ding (a1) and W. C. Livingston (a2)

Abstract

CaII K line has been measured regularly nearly every month since 1974 at Kitt Peak. Our study on the data of CaII K profiles over two solar cycles indicates that in center disc spectra, the distance of the K1 component of the CaII K line from the line center and its intensity show periodical variations, but has a time delay of 1.2 years with respect to the sunspot number. Non-LTE computation implies a cyclic temperature variation of about 17 K of the temperature minimum region (TMR) in the quiet-Sun atmosphere and a cyclic variation of about 15-20 km of the position of the TMR.

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Copyright

References

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Fang, et al. 1986 In: The Lower Atmosphere of Solar Flares, ed. Neidig, D. F., NSO, Sunspot, New Mexico, 117.
LaBonte, B. J., & Robert, H. 1982 Solar Phys., 80, 15.
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White, O. R., & Livingston, W. C. 1981 ApJ, 249, 798.

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