Table 1
Prominence data per year published in the yearbooks and bulletins of the Madrid Astronomical Observatory for the period 1906–1957. The columns represent: (i) the year of the observations, (ii) the number of observation days in the corresponding year, (iii) the number of prominences observed in the corresponding year, and frequency of the (iv) total, (v) north, and (vi) south number of prominences (that is, the total, north, and south number of prominences divided by the number of observation days).
| Year | Days | N | ft | fn | fs | Year | Days | N | ft | fn | fs |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1906 | 153 | 954 | 6.24 | 3.72 | 2.48 | 1934 | 85 | 297 | 3.49 | 1.61 | 1.88 |
| 1907 | 131 | 1084 | 8.27 | 4.11 | 4.16 | 1935 | 256 | 1243 | 4.86 | 2.20 | 2.68 |
| 1908 | 194 | 1857 | 9.57 | 4.50 | 5.07 | 1936 | 169 | 1097 | 6.49 | 3.37 | 3.22 |
| 1909 | 214 | 1789 | 8.36 | 4.27 | 4.09 | 1937 | 184 | 1178 | 6.40 | 3.13 | 3.27 |
| 1910 | 198 | 1143 | 5.77 | 2.71 | 3.06 | 1938 | 94 | 318 | 3.38 | 2.15 | 1.35 |
| 1911 | 160 | 545 | 3.41 | 1.01 | 2.40 | 1939 | 40 | 186 | 4.65 | 2.76 | 1.91 |
| 1912 | 174 | 353 | 2.03 | 0.60 | 1.43 | 1940 | 54 | 259 | 4.80 | 2.09 | 2.70 |
| 1913 | 153 | 300 | 1.97 | 0.78 | 1.19 | 1941 | 102 | 347 | 3.40 | 1.91 | 1.49 |
| 1914 | 163 | 502 | 3.08 | 1.30 | 1.78 | – | – | – | – | – | – |
| 1915 | 114 | 586 | 5.14 | 2.61 | 2.53 | 1943 | 24 | 81 | 3.37 | 1.13 | 2.25 |
| 1916 | 146 | 969 | 6.29 | 3.47 | 2.82 | 1944 | 184 | 580 | 3.15 | 1.53 | 1.62 |
| 1917 | 113 | 876 | 7.75 | 4.08 | 3.67 | 1945 | 147 | 711 | 4.84 | 2.14 | 2.70 |
| 1918 | 116 | 670 | 5.78 | 2.33 | 3.45 | 1946 | 98 | 724 | 7.4 | 3.7 | 3.8 |
| 1919 | 139 | 640 | 4.60 | 2.52 | 2.08 | 1947 | 94 | 756 | 8.0 | 4.3 | 4.0 |
| 1920 | 109 | 437 | 4.01 | 1.69 | 2.32 | 1948 | 122 | 1020 | 8.4 | 4.1 | 4.7 |
| – | – | – | – | – | – | 1949 | 130 | 967 | 7.4 | 4.4 | 3.4 |
| 1925 | 62 | 379 | 6.10 | 3.74 | 2.36 | 1950 | 115 | 609 | 5.3 | 3.0 | 2.4 |
| 1926 | 88 | 564 | 6.41 | 3.62 | 2.78 | 1951 | 163 | 762 | 4.7 | 2.3 | 2.5 |
| 1927 | 106 | 573 | 5.41 | 2.98 | 2.43 | 1952 | 155 | 540 | 3.5 | 1.9 | 1.7 |
| 1928 | 102 | 568 | 5.57 | 2.68 | 2.89 | 1953 | 204 | 561 | 2.8 | 1.4 | 1.3 |
| 1929 | 74 | 316 | 4.27 | 1.69 | 2.58 | 1954 | 257 | 593 | 2.3 | 1.3 | 1.0 |
| 1930 | 122 | 397 | 3.25 | 1.71 | 1.54 | 1955 | 177 | 616 | 3.5 | 2.1 | 1.4 |
| 1931 | 143 | 502 | 3.51 | 1.78 | 1.73 | 1956 | 221 | 925 | 4.2 | 2.4 | 1.8 |
| 1932 | 153 | 451 | 2.95 | 1.76 | 1.19 | 1957 | 34 | 124 | 3.6 | 2.1 | 1.5 |
| 1933 | 136 | 364 | 2.68 | 1.63 | 1.05 | – | – | – | – | – | – |
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