warning m x class solar flares venus retrogrades sunspots AR 1934 1928 1931 1929 1930 1921 1933 1923 number 108 23 dec 2013

warning m x class solar flares venus retrogrades sunspots AR 1934 1928 1931 1929 1930 1921 1933 1923 number 108 23 dec 2013

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