Coronal general magnetic field evolution as a new parameter of the solar cycle

Details Coronal general magnetic field evolution as a new parameter of the solar cycle Coronal general magnetic field evolution as a new parameter of the solar cycle

Apr 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977soph...52...41y&link_type=abstract

Solar Physics, vol. 52, Apr. 1977, p. 41-52.

Physics

8

Magnetic Field Configurations, Solar Corona, Solar Cycles, Solar Magnetic Field, Lines Of Force, Magnetic Effects, Solar Activity Effects

Scientific paper

The evolution of the geometry of the coronal magnetic-field lines calculated from the surface magnetic field is studied using the radial component of the general magnetic field generated by a global-convection-driven solar-cycle model for the surface field. The surface and coronal field geometries are compared in order to determine how the solar-cycle evolution of the surface field affects the dynamics of the corona and why the coronal field resembles a dipole even though the distribution of the general surface field is quadrupolelike in most phases of the solar cycle. An attempt is made to extract some general property of coronal field geometry that can function as a solar-cycle parameter, that way in which coronal field geometry evolves during a solar cycle is investigated, and the relation between the appearance of polar plumes and the evolution of coronal magnetic-field lines is evaluated. It is concluded that the evolution of coronal field geometry results from the evolution of general surface magnetic fields characterized by a quadrupolelike pattern of two branches (equatorial and polar) with opposite polarities in each hemisphere.

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