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Magnetic space-based field measurementsBecause the near Earth magnetic field is a complex combination of fields from outside the Earth of fields from its core and of fields from its crust, measurements from space prove to be the only practical way to obtain timely, global surveys. Due to difficulty in making accurate vector measurements, early satellites such as Sputnik and Vanguard measured only the magnitude survey. The attitude accuracy was 20 arc sec. Both the Earth's core fields and the fields arising from its crust were mapped from satellite data. The standard model of the core consists of a scalar potential represented by a spherical harmonics series. Models of the crustal field are relatively new. Mathematical representation is achieved in localized areas by arrays of dipoles appropriately located in the Earth's crust. Measurements of the Earth's field are used in navigation, to map charged particles in the magnetosphere, to study fluid properties in the Earth's core, to infer conductivity of the upper mantels, and to delineate regional scale geological features.
Document ID
19810011154
Acquisition Source
Legacy CDMS
Document Type
Preprint (Draft being sent to journal)
Authors
Langel, R. A.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
September 4, 2013
Publication Date
March 1, 1981
Subject Category
Geophysics
Report/Patent Number
NASA-TM-82104
Accession Number
81N19681
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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