Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...175..238b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 175, no. 1-2, March 1987, p. 238-242.
Astronomy and Astrophysics
Astrophysics
2
Magnetohydrodynamic Flow, Photosphere, Solar Activity, Solar Magnetic Field, Boundary Value Problems, Least Squares Method, Magnetic Field Configurations, Velocity Distribution
Scientific paper
Existing methods for the determination of the photospheric magnetic field and velocity vectors from a time sequence of observations (Levine and Nakagawa, 1974; Frazier, 1976) are first criticized and it is then shown how they can be improved by more suitable assumptions. It turns out that a unique solution cannot be obtained but in the least squares sense. The constraint which remains free is the initial condition in the iterative scheme; the constraint proposed by Frazier (1976) is revisited and replaced by the fact that vertical velocities are weak at the photosphere. Also, the equation of motion is taken into account in order to reduce the arbitrariness of involved parameters.
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