sentences:  During July 1899 to April 1900, Moltke joined an aurora expedition to Akureyri in Iceland..The expedition was arranged and headed by the director, Adam F. W. Paulsen (1833-1907), of the Danish Meteorological Institute (DMI).Further participants were Dan Barfod la Cour (1876-1942), director of DMI 1923-1942, and Ivar B. Jantzen (1875-1961).