Georg Heinrich Thiessen

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Georg Heinrich Thiessen

Georg Heinrich Thiessen (born January 19, 1914 in Eddelak near Brunsbüttelkoog , † July 3, 1961 ) was a German astronomer .

Life

Georg Thiessen studied physics and mathematics and received his doctorate in 1940 at the Georg-August-Universität Göttingen under Richard Becker . In 1943 he came to the Fraunhofer Institute of the Reich Office for High Frequency Research in Freiburg im Breisgau , where he met Karl-Otto Kiepenheuer . In January 1945 he was transferred to the observatory in Hamburg-Bergedorf , where he was an assistant and then an observer from 1946 to 1953. In 1953 he completed his habilitation on the sun's magnetic field , and in 1959 he was appointed professor. He believed that there was a general solar magnetic field.

On July 3, 1961, he was killed in a head-on collision with a tram, and his wife was seriously injured in this accident.

In 1970 the Thiessen crater on the back of the moon was named after him.

literature

1946 La mesure du champion magnétique général du Soleil
1949 Visual study of the sun's general magnetic field. With 6 text illustrations
1949 The Sun's magnetic field
1950 The structure of the sunspot umbra
1951 On the theory of the polarization of H α and D 3 in protuberances. With 1 text illustration
1951 The Bergedorf counter chronograph
1951 Polarization in H alpha and D3 in prominences
1952 Photoelectric measurements of the solar magnetic field. With 3 text images
1952 A magnetically induced polarization effect on resonance lines in the star spectrum. I. With 1 text illustration
1953 For the fine structure of the color brightness diagram of the star cluster Coma Berenices. With 3 text images
1953 The effect of interstellar polarization in the solar corona
1955 Color-and Light-Intensity Distribution in the Central Region of M 31
1955 N / A
1955 For sun granulation. With 1 text illustration
1956 Investigations on pulsating stars. I. The supergiant system BM Cassiopeiae. With 5 text images
1957 Investigations on pulsating stars. II. To determine the true pulsation speed from the radial speed measurements. With 3 text images
1957 Color fluctuations in the Epsilon Aurigae system. With 1 text illustration
1957 Photoelectric investigations on comets. I. Secondary changes in brightness and solar activity at comet Arend-Roland (1956 h). With 7 text images
1958 Photoelectric investigations on comets. II. The brightness distribution, the movement conditions and the lifetime of the luminous particles in the tail of the comet Arend-Roland (1956 h). With 4 text images
1958 Investigations on pulsating stars. III. About the turbulence and rotation speed of η Aquilae. With 5 text images
1958 On photoelectric polarization photometry
1959 Via a polarization effect on vapor-deposited aluminum layers with vertical light incidence. With 2 text images
1961 About the polarization of starlight, the radiation of the stars and comments on the galactic structure
1962 Comments on the origin of the polarization of starlight ". With 1 text illustration
1980 Bright Dots Inside Sunspots

Sunspots

Thiessen dealt extensively with sunspots . He observed that the granulation that occurs everywhere on the rest of the sun's surface does not exist in the umber . On closer inspection of the sunspots, however, he noticed that there were small, lighter spots (umbral dots) within the umber. They are difficult to observe because of the high contrast to the bright surroundings of sunspots. These spots provide information about the internal structure of sunspots and are still the subject of astrophysical research.

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personal data
SURNAME Thiessen, Georg Heinrich
BRIEF DESCRIPTION German astronomer
DATE OF BIRTH January 19, 1914
PLACE OF BIRTH Eddelak
DATE OF DEATH 3rd July 1961