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    Geomagnetic field models incorporating physical constraints on the secular variation (1993)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: This proposal has been concerned with methods for constructing geomagnetic field models that incorporate physical constraints on the secular variation. The principle goal that has been accomplished is the development of flexible algorithms designed to test whether the frozen flux approximation is adequate to describe the available geomagnetic data and their secular variation throughout this century. These have been applied to geomagnetic data from both the early and middle part of this century and convincingly demonstrate that there is no need to invoke violations of the frozen flux hypothesis in order to satisfy the available geomagnetic data.
    Keywords: GEOPHYSICS
    Type: NASA-CR-195165 , NAS 1.26:195165
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 2
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    Geomagnetic field models incorporating frozen-flux constraints (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: An algorithm is developed for constructing plausible field models satisfying the frozen-flux hypothesis of Roberts and Scott (1965), which supposes that, for short time intervals, diffusion can be neglected. The algorithm is based on a new parameterization of the field in terms of its radial component B(r) at the core-mantle boundary (CMB). The model consists of values of B(r) at a finite set of points on the CMB, together with a rule for interpolating the values to other points. The parameterization of the B(r) is used to construct field models satisfying the frozen-flux hypothesis for the epochs 1945.5 and 1980.
    Keywords: GEOPHYSICS
    Type: Geophysical Journal International (ISSN 0956-540X); 113; 2; p. 419-433.
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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