The generation of magnetic fields in photospheric layers

Details The generation of magnetic fields in photospheric layers The generation of magnetic fields in photospheric layers

Jul 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986soph..106....1w&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 106, July 1986, p. 1-28.

Physics

Plasma Physics

20

Magnetic Flux, Photosphere, Solar Magnetic Field, Dynamo Theory, Kinematic Equations, Magnetohydrodynamic Flow, Plasma Physics, Stellar Models

Scientific paper

In this paper the physics of flux changes are reviewed and the various terms in the hydromagnetic equation which give rise to the growth and decay of magnetic flux are examined. Several kinematic models for field changes are examined and it is shown that new flux loops may be generated by suitable oscillatory velocity fields near the boundaries of existing magnetic structures, thus increasing the gross flux through the photosphere. It is suggested that this mechanism may account for the appearance of moving magnetic features (knots of opposite polarities) at the boundaries of decaying sunspots. Other models are discussed and a tentative explanation of the apparently unbalanced growth of opposite polarities is given in terms of a current-sheet model.

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