- Chapman , Sydney
*(1888–1970) British mathematician and geophysicist*Born in Eccles near Manchester, Chapman entered Manchester University in 1904 to study engineering. After graduating in 1907, his interest was diverted into more strictly mathematical areas, and he went to Cambridge to study mathematics, graduating in 1910. His first post was as chief assistant at the Royal Observatory, Greenwich, and his work there sparked off his lasting interest in a number of fields of applied mathematics, notably geomagnetism. In 1914 Chapman returned to Cambridge as a lecturer in mathematics, and in 1919 he moved back to Manchester as professor of mathematics, remaining there for five years. From 1924 to 1946 he was professor of mathematics at Imperial College, London. After working at the War Office during World War II he moved to Oxford to take up the Sedleian Chair in natural philosophy, from which he retired in 1953. However, his retirement meant no lessening in his teaching and research activity, which continued for many years at the Geophysical Institute, Alaska, and at the High Altitude Observatory at Boulder, Colorado.The two main topics of Chapman's mathematical work were the kinetic theory of gases and geomagnetism. In the 19th century James Clerk Maxwell and Ludwig Boltzmann had put forward ideas about the properties of gases as determined by the motion of the molecules of the gas. Chapman's work, which he began in 1911, was the next major step in the development of a full mathematical treatment of the kinetic theory. The Swedish mathematician Enskog had been working, independently of Chapman, along similar lines, and the resulting theory is now generally known as the*Chapman–Enskog theory of gases*. While working in 1917 on mixtures of gases Chapman predicted the phenomenon of gaseous thermal diffusion. His subsequent work on the upper atmosphere was a practical application of his earlier more theoretical study of gases.Highlights of Chapman's work on geomagnetism are his work on the variations in the Earth's magnetic field in periods of a lunar day (27.3 days) and its submultiples. This he showed to be the result of a small tidal movement set up in the Earth's atmosphere by the Moon. He also developed, in 1930, in collaboration with one of his students, what has become known as the*Chapman–Ferraro theory*of magnetic storms. In collaboration with Julius Bartels, Chapman wrote*Geomagnetism*(2 vols. 1940), which soon established itself as a standard work.

*Scientists.
Academic.
2011.*

### Look at other dictionaries:

**Chapman, Sydney**— ▪ British mathematician and physicist born Jan. 29, 1888, Eccles, Lancashire, Eng. died June 16, 1970, Boulder, Colo., U.S. English mathematician and physicist noted for his research in geophysics. Chapman was educated at Victorian… … Universalium**Sydney Chapman (mathematician)**— Sydney Chapman FRS (29 January 1888 ndash; 16 June 1970Obituary, The Times [http://www history.mcs.st andrews.ac.uk/Obits/Chapman.html] ] T. G. Cowling, Sydney Chapman. 1888 1970, Biographical Memoirs of Fellows of the Royal Society, Vol. 17,… … Wikipedia**Sydney chapman (1888-1970)**— Pour l’article homonyme, voir Sydney Chapman. Sydney Chapman (29 janvier 1888 19 juin 1970) est un astronome et géophysicien britannique. Il naît à Manchester et étudie à la Royal Technical Institute (maintenant l université de… … Wikipédia en Français**Chapman (surname)**— This article is about the surname Chapman. For other uses, see Chapman. Chapman Family name Meaning Business man or trader Chapman is a surname and perhaps an occupational surname. There is not a single agreed origin of the surname Chapman.… … Wikipedia**Sydney Chapman (1888-1970)**— Pour l’article homonyme, voir Sydney Chapman. Sydney Chapman Naissance 29 janvier 1888 Manchester (Angleterre) Décès 16 juin 1970 … Wikipédia en Français**Chapman-Zyklus**— Ozon Sauerstoff Zyklus in der Ozonschicht. Der Ozon Sauerstoff Zyklus ist der Vorgang, durch welchen Ozon fortwährend in der Stratosphäre erneuert wird, wobei Ultraviolette Strahlung in Wärmeenergie umgewandelt wird. Im Jahr 1930 wurden die… … Deutsch Wikipedia**Sydney Chapman**— (29 de enero de 1888 – 16 de junio de 1970) fue un matemático y geofísico angloamericano, nacido en Mánchester, Reino Unido. Estudió en el Royal Technical Institute de Salford (hoy en día la Universidad de Salford) y en las universidades de… … Wikipedia Español**Chapman (name)**— Chapman is a surname. People with the surname or nickname Chapman include: *Allan Chapman, British historian of science *Alvan Wentworth Chapman, American botanist *Anne Chapman, Franco American ethnologist *Ben Chapman (politician) (born 1940),… … Wikipedia**Sydney Chapman**— (* 29. Januar 1888 in Eccles bei Manchester; † 16. Juni 1970 in Boulder, Vereinigte Staaten) war ein britischer Physiker, Astronom und Geophysiker. Leben und Wirken Chapman wollte zunächst Ingenieur werden und studierte am Royal Technical… … Deutsch Wikipedia**Chapman**— es el apellido de diferentes personajes reales y de ficción: Tracy Chapman, (Cleveland, Ohio, 1964) es una cantautora estadounidense ganadora de varios premios Grammy. George Chapman, (Hitchin, Hertfordshire h. 1559 Londres 1634) fue un poeta,… … Wikipedia Español