Physics
Scientific paper
Aug 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994soph..153..131s&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 153, no. 1-2, p. 131-141
Physics
13
Line Spectra, Magnetic Field Configurations, Mathematical Models, Photosphere, Polarity, Solar Cycles, Solar Magnetic Field, Solar Rotation, Iron, Least Squares Method, Magnetic Signatures, Solar Observatories
Scientific paper
Sixteen years of Wilcox Solar Observatory (WSO) magnetogram data have been studied to determine the solar cycle variation and latitude dependence of the east-west inclination of photospheric magnetic field lines. East-west inclination is here defined as the angle between a field line and its local radial vector, as projected onto the plane of the latitude and line of sight. Inclination is determined by a least-squares fit of observed magnetic fields to a simple projection model, and is found to depend on polarity and to change with the solar cycle. Leading and following polarities are tipped towards each by about 9 deg and have an overall net tilt in the direction of rotation (to the west) of 0.6 deg. New cycles are seen to begin at high latitudes and to grow through the lower latitudes over approximately 5 years, providing evidence for an extended cycle length of 16-18 years.
Scherrer Philip H.
Shrauner Jay Arthur
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