* InterDiurnal Variability Index [IDV] * Leif Svalgaard, 2009 * IDV Obs * year IDV09 HMF B HMF B 1835.5 11.60 7.24 1836.5 16.30 9.24 1837.5 16.00 9.11 1838.5 16.80 9.44 1839.5 14.00 8.27 1840.5 12.20 7.50 1841.5 10.10 6.57 1842.5 9.00 6.08 1843.5 8.90 6.03 1844.5 8.50 5.85 1845.5 9.50 6.30 1846.5 10.60 6.80 1847.5 11.40 7.15 1848.5 12.87 7.79 1849.5 11.89 7.36 1850.5 9.39 6.26 1851.5 9.35 6.24 1852.5 7.35 5.32 1853.5 8.56 5.88 1854.5 6.59 4.96 1855.5 6.03 4.68 1856.5 7.73 5.49 1857.5 8.56 5.88 1858.5 11.51 7.20 1859.5 15.29 8.81 1860.5 14.23 8.37 1861.5 12.91 7.80 1862.5 11.28 7.10 1863.5 9.73 6.41 1864.5 8.48 5.84 1865.5 7.88 5.56 1866.5 7.50 5.39 1867.5 7.18 5.24 1868.5 8.96 6.06 1869.5 12.27 7.53 1870.5 17.39 9.68 1871.5 15.90 9.07 1872.5 15.12 8.74 1873.5 11.84 7.34 1874.5 9.16 6.15 1875.5 7.54 5.41 1876.5 7.76 5.51 1877.5 7.27 5.28 1878.5 6.64 4.98 1879.5 6.54 4.93 1880.5 8.42 5.81 1881.5 9.58 6.34 1882.5 11.35 7.13 1883.5 10.67 6.83 1884.5 9.51 6.31 1885.5 9.79 6.44 1886.5 9.09 6.12 1887.5 7.60 5.43 1888.5 6.97 5.13 1889.5 6.95 5.13 1890.5 6.69 5.00 1891.5 8.58 5.88 1892.5 13.81 8.19 1893.5 10.46 6.73 1894.5 12.81 7.76 1895.5 9.83 6.45 1896.5 10.07 6.56 1897.5 8.63 5.91 1898.5 8.22 5.72 1899.5 6.94 5.12 1900.5 5.75 4.55 1901.5 4.89 4.12 1902.5 5.05 4.20 1903.5 6.88 5.09 1904.5 7.26 5.27 1905.5 8.51 5.85 1906.5 7.40 5.34 1907.5 8.83 6.00 1908.5 9.54 6.32 1909.5 9.90 6.48 1910.5 8.05 5.64 1911.5 6.97 5.14 1912.5 5.61 4.48 1913.5 5.05 4.20 1914.5 5.90 4.62 1915.5 7.89 5.57 1916.5 9.01 6.08 1917.5 10.85 6.91 1918.5 10.74 6.86 1919.5 11.29 7.10 1920.5 10.23 6.63 1921.5 8.79 5.98 1922.5 7.55 5.41 1923.5 6.02 4.68 1924.5 6.76 5.04 1925.5 7.95 5.60 1926.5 10.66 6.82 1927.5 9.22 6.18 1928.5 9.58 6.34 1929.5 9.54 6.32 1930.5 10.14 6.59 1931.5 7.28 5.28 1932.5 7.20 5.25 1933.5 6.88 5.10 1934.5 6.81 5.06 1935.5 7.70 5.48 1936.5 8.76 5.97 1937.5 12.05 7.43 1938.5 13.83 8.20 1939.5 12.55 7.65 1940.5 12.47 7.61 1941.5 12.19 7.49 1942.5 9.49 6.30 1943.5 9.03 6.09 1944.5 8.18 5.70 1945.5 8.72 5.95 1946.5 14.33 8.41 1947.5 13.79 8.18 1948.5 10.80 6.88 1949.5 13.45 8.04 1950.5 12.43 7.60 1951.5 12.28 7.53 1952.5 10.96 6.95 1953.5 8.89 6.03 1954.5 7.48 5.38 1955.5 8.60 5.89 1956.5 13.29 7.97 1957.5 16.54 9.34 1958.5 15.37 8.85 1959.5 14.32 8.41 1960.5 15.86 9.05 1961.5 11.44 7.17 1962.5 8.59 5.89 1963.5 8.06 5.64 5.45 1964.5 7.17 5.23 5.12 1965.5 6.92 5.11 5.06 1966.5 7.87 5.56 6.00 1967.5 10.28 6.66 6.36 1968.5 9.46 6.29 6.19 1969.5 9.37 6.25 6.05 1970.5 10.13 6.59 6.35 1971.5 8.84 6.00 6.00 1972.5 9.49 6.30 6.38 1973.5 9.27 6.20 6.35 1974.5 9.13 6.14 6.63 1975.5 8.10 5.67 5.82 1976.5 8.71 5.94 5.45 1977.5 8.95 6.05 5.85 1978.5 12.31 7.54 7.08 1979.5 11.77 7.31 7.59 1980.5 10.50 6.75 6.98 1981.5 13.77 8.17 7.84 1982.5 15.24 8.79 8.81 1983.5 11.59 7.23 7.61 1984.5 10.44 6.72 7.32 1985.5 9.04 6.10 5.89 1986.5 8.79 5.98 5.74 1987.5 8.20 5.71 6.09 1988.5 10.21 6.62 7.30 1989.5 16.72 9.41 8.15 1990.5 12.83 7.77 7.29 1991.5 15.74 9.00 9.34 1992.5 12.85 7.78 8.25 1993.5 10.08 6.57 6.59 1994.5 9.05 6.10 6.15 1995.5 9.07 6.11 5.72 1996.5 6.74 5.03 5.11 1997.5 8.04 5.64 5.51 1998.5 10.35 6.69 6.89 1999.5 9.82 6.45 6.91 2000.5 13.35 7.99 7.18 2001.5 13.41 8.02 6.94 2002.5 10.89 6.92 7.64 2003.5 12.31 7.54 7.60 2004.5 9.35 6.23 6.53 2005.5 9.40 6.26 6.25 2006.5 7.22 5.25 5.03 2007.5 5.95 4.65 4.48 2008.5 5.25 4.30 4.23 2009.4 5.04 4.19 4.10