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On the geometric flattening index of the solar corona

  • Solar Physics
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Abstract

Values of the Nikol’skii geometric flattening index of the solar corona, H, have been collected for 77 total solar eclipses from 1860 to 2010. The dependence of the H index on the Wolf number and the phase of solar activity is studied. The H index is found to take values in the range 0.9 to 2.5 and to anticorrelate with solar activity: the maximum values of the index are observed at solar minima and the minimum values are observed at solar maxima. In addition, the correlations between the H index and the Ludendorff photometric flattening index a + b and between the H index and extent of polar ray systems along the limb are investigated.

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Authors and Affiliations

  1. Astronomical Observatory, National Taras Shevchenko University of Kyiv, ul. Observatornaya 3, Kyiv, 04053, Ukraine

    N. I. Pishkalo

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  1. N. I. Pishkalo
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Correspondence to N. I. Pishkalo.

Additional information

Original Russian Text © N.I. Pishkalo, 2012, published in Kinematika i Fizika Nebesnykh Tel, 2012, Vol. 28, No. 4, pp. 49–55.

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Pishkalo, N.I. On the geometric flattening index of the solar corona. Kinemat. Phys. Celest. Bodies 28, 183–188 (2012). https://doi.org/10.3103/S0884591312040058

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  • DOI: https://doi.org/10.3103/S0884591312040058

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