the earth's magnetic field, echoing in radio transmissions, nacreous clouds and luminous night clouds, zodiacal light, meteor trails, the solar corona and solar vortices, and cosmic rays. Awards and honors Størmer was a Foreign Member of the Royal Society (ForMemRS) and a Corresponding Member of the French Academy of Sciences. He was also a member of the Norwegian Academy of Science and Letters from 1900. He was given honorary degrees by Oxford University (in 1947), the University of Copenhagen (1951), and the Sorbonne (1953), and in 1922 the French Academy awarded him their Janssen Medal. Three times Størmer was a plenary speaker in the International Congress of Mathematicians (1908 in Rome, 1924 in Toronto, and 1936 in Oslo); he was an invited speaker of the ICM in 1920 in Strasbourg and in 1932 in Zurich. In 1971, the crater Störmer on the far side of the Moon was named after him. In 1902, Størmer was decorated with King Oscar II's Medal of Merit in gold. He was also decorated as a Knight, First Order of the Order of St. Olav in 1939. He was upgraded to Grand Cross of the Order of St. Olav in 1954. References 1874 births 1957 deaths People from Skien University of Oslo alumni University of Paris alumni Academic staff of the University of Oslo Norwegian astronomers Norwegian mathematicians Norwegian physicists Number theorists 20th-century astronomers Members of the Norwegian Academy of Science and Letters Foreign Members of the Royal Society Members of the French Academy of Sciences Presidents of the Norwegian Mathematical Society