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Manuscript Title: Numerical evaluation of geomagnetic dynamo integrals (Elsasser and Adams-Gaunt integrals).
Authors: W. Moon
Program title: ELSGAU
Catalogue identifier: ACYX_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 16(1979)267
Programming language: Fortran.
Computer: IBM 370/158.
Operating system: OS.
RAM: 25K words
Word size: 8
Keywords: Geophysics, Elsasser integral, Adams-gaunt integral, Geomagnetic dynamo Integrals.
Classification: 13.

Revision history:
Type Tit le Reference
adaptation 0001 ADDITION OF FUNCTION DJSQ See below

Nature of problem:
Numerical evaluation of Elsasser integrals and Adams-Gaunt integrals to apply to the normal mode studies of realistic earth models.

Solution method:
Elasser and Adams-Gaunt integrals are expanded using 3-J vector coupling coefficients and numerically computed checking appropriate selection rules.

Restrictions:
As long as the order and degree of the integrands are integers there is no restriction.

Running time:
0.36 s for the test run.

ADAPTATION SUMMARY
Manuscript Title: J-square.
Authors: W. Moon
Program title: 0001 ADDITION OF FUNCTION DJSQ
Catalogue identifier: ACYX_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 22(1981)97
Programming language: Fortran.
Classification: 13.

Nature of problem:
The J - square is a measure of the physical coupling of the normal modes of a vibrating system. The J - square appears in the computation of long-period eigenfunctions of realistic Earth models. In the previous study, the conventional spherical harmonics are used for normal-mode coupling and one had to evaluate Elsasser and Adams-Gaunt integrals. However it is found that, in certain cases, the generalized spherical harmonics are much more convenient. The coupling coefficient in this new approach is represented as J - square and a numerical scheme to compute J - square is included in this adaptation.

Solution method:
The J-square can be computed using 3-J vector coupling coefficient and appropriate selection rules.

Restrictions:
If each element of J-square is clearly defined there is no restriction.

Running time:
0.07 s for test run.