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Bangui magnetic anomaly
The Bangui magnetic anomaly is a local variation in the Earth's magnetic field centered at Bangui, the capital of Central African Republic. It is roughly elliptical, about , and covers most of the country, making it one of the "largest and most intense crustal magnetic anomalies on the African continent". The anomaly was discovered in the late 1950s, explored in the 1970s, and named in 1982. Its origin remains unclear.
==History==
In 1962, Raymond Godivier and Lucien Le Donche reported on a magnetic anomaly in Central African Republic, which they identified by analyzing their surface magnetic activity data of 1956. These results were confirmed and elaborated by the high-altitude aeromagnetic surveys carried out by the US Naval Oceanographic Office, as well as by the satellite measurements conducted in 1964 with Cosmos 49 and in the 1970s with the Orbiting Geophysical Observatory at altitudes. These data were combined in 1973 yielding a spatial map of magnetic field, which was updated after the launch of Magsat satellite with an accuracy of 15 nT at an altitude of .〔〔
In 1982, Robert D. Regan and Bruce D. Marsh named the anomaly after the city in the center of the anomaly.〔
This anomaly is sometimes called the Bangui negative anomaly, owing to its negative peak-to-trough difference, and is compared with the positive anomalies observed at the Benue trough and Congo Basin where Lower Cambrian geological formations are exposed.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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