Comparison of Synoptic Maps of Solar Soft X-Ray Features, Photospheric Magnetic Fields, and Helium 1083 NM

Details Comparison of Synoptic Maps of Solar Soft X-Ray Features, Photospheric Magnetic Fields, and Helium 1083 NM Comparison of Synoptic Maps of Solar Soft X-Ray Features, Photospheric Magnetic Fields, and Helium 1083 NM

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...18512308h&link_type=abstract

American Astronomical Society, 185th AAS Meeting, #123.08; Bulletin of the American Astronomical Society, Vol. 26, p.1523

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We studied the wealth of structural features visible in Yohkoh/SXT and NSO/KP synoptic maps of the Sun that cover Carrington rotations 1847 through 1879. In order to do this comparison, various methods to reduce soft X-ray maps to simple structural elements were explored. In the end, the best way of comparing the various data sets turned out to be to filter the X-ray maps to emphasize high-spatial frequencies and then to either simply blink the various images or to make colorized composite maps that distinctively assign different colors to various quantities. Among the results are: 1. Active regions exhibit normal or "anemone" (fountain-like) X-ray loop structure tendency depending on whether the surrounding large-scale unipolarity of the magnetic field is small or large. 2. There is a systematic twist of the coronal loops around magnetic concentrations in the southern hemisphere and vice-versa in the north. The sense is the same as one would expect from the action of differential rotation. 3. Dark lanes in the X-ray images are centered over large-scale polarity patterns of one sign or the other. 4. The X-ray loops at the boundaries between large-scale opposite polarity patterns are frequently strongly sheared. The presence or absence of a filament in these locations may be related in a complicated way to the amount of shear. 5. At the resolution of the synoptic maps, the footpoints of X-ray loops are almost always rooted in locally strong magnetic concentrations and also in extra-dark 1083 nm elements.

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