Gnevyshev-Ohl rule

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The Gnevyshev-Ohl rule is an empirical rule according to which the sum of sunspot numbers over an odd cycle exceeds that of the preceding even cycle.[1] The rule breaks down under certain conditions. [2]


  1. ^ Gnevishev M.N., Ohl A.I., 1948: About 22-year cycle of solar activity. Astronomical Journal. V.25, 18-20 (in Russian).
  2. ^ Komitov, B., Bonev, B. AMPLITUDE VARIATIONS OF THE 11 YEAR CYCLE AND THE CURRENT SOLAR MAXIMUM 23, The Astrophysical Journal, 554:L000–L000, 2001 June 10