Julius Bartels
August Julius Bartels ( born August 17, 1899 in Magdeburg, † March 6, 1964 ) was a German geophysicist.
Life
In 1917 he began his studies in Göttingen, where he graduated in 1923 with a dissertation on Wilhelm Meinardus. Among his teachers were Emil Wiechert next to Max Born, among others, Richard Courant, James Franck and David Hilbert. He was later a teacher of the famous geophysicist and Hydrodynamikers Hans Ertel.
After his habilitation he taught since 1936 as a full professor at the University of Berlin and since 1946 in Göttingen. He was director of the Institute of Geophysics of the Georg-August -Universität Göttingen. He was also from 1955 to 1964 director of the Institute of Physics of the Stratosphere at the Max Planck Institute for Aeronomy in Katlenburg- Lindau. In 1941 he was elected a member of the German Academy of Sciences Leopoldina.
Julius Bartels identified the sun as a source of regularly recurring geomagnetic disturbances. He developed in 1949 as a measure of the geomagnetic activity Kp index, which is determined using a standardized procedure from the data of 13 observatories worldwide and even today can still find wide application. The Kp index is of the IUGG / IAGA ( Geomagnetism and Aeronomy International Association of ) recognized as an important yardstick and determined since 1997 on geomagnetic observatory Niemegk.
Julius Bartels has served on numerous national and international scientific societies and was honored in 1955 with the first ever on this occasion Emil Wiechert Medal. In his honor, the Julius Bartels Medal is awarded by the Department of Solar-Terrestrial Relations of the European Geosciences Union.
Named after him is the Bartels'sche rotation speed of the sun.
Works
- Geophysics, Heidelberg, C. Winter 1944
- Publisher Gustav Angenheister: Geophysics, Fischer Library in 1960, 1969
- Participation in Beno Gutenberg (Editor) Textbook of geophysics, Berlin, Gebrüder Borntraeger 1929
- With Sydney Chapman Geomagnetism, Oxford, Clarendon Press 1940