The sunspot cycle variations of the neutral line on the source surface

Details The sunspot cycle variations of the neutral line on the source surface The sunspot cycle variations of the neutral line on the source surface

May 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....94.5453s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, May 1, 1989, p. 5453-5455.

Physics

8

Solar Rotation, Sunspot Cycle, Surface Geometry, Dipoles, Interplanetary Medium, Solar Magnetic Field

Scientific paper

The earlier presentation method of the sunspot cycle variations of the neutral line on the source surface by introducing the view longitude is defined. It is shown that the neutral line seen from the view longitude and the equivalent dipole (determined by Hoeksema, 1984) showed a trend of rotation throughout the sunspot cycle. However, the surface bounded by the neutral line is generally far from a circle. In fact, our combined presentation of both the equivalnet dipole and the nuetral line indicates graphically that such a simple description of the rotating (equivalent) dipole may be misleading. The concept of an inclined dipole with respect to the rotation axis may also be misleading.

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