Physics
Scientific paper
Sep 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986stin...8720163h&link_type=abstract
Unknown
Physics
Magnetic Field Configurations, Photosphere, Rates (Per Time), Rotation, Solar Corona, Solar Physics, Frequencies, Models, Northern Hemisphere, Southern Hemisphere, Spectrum Analysis, Structural Analysis
Scientific paper
The coronal magnetic field rotates differently than the photosphere. The field configuration of the corona can be calculated from the observed photospheric field using a potential field model. Correlation of the field patterns at different latitudes with a lag near one solar rotation shows much less differential rotation than observed in the photospheric field; however, the peak is very broad and determines the rotation rate rather poorly. Consideration of longer lags reveals a more complex rotational structure and indicates different rotation rates in the northern and southern hemispheres. Spectral analysis of the equatorial dipole component of the coronal field reveals an organization into just a few discrete rotation frequencies which are apparently present simultaneously. Spectral analysis of the field at different latitudes shows that the frequencies are present simultaneously. Spectral analysis of the field at different latitudes shows that the frequencies are present simultaneously, but in different hemispheres, and that the Southern Hemisphere fields rotate more slowly than those in the north in solar cycle 21.
Hoeksema Jon Todd
Scherrer Philip H.
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