Solar Cycle Dependency of X-Ray Bright Points and Photospheric Bipoles

Details Solar Cycle Dependency of X-Ray Bright Points and Photospheric Bipoles Solar Cycle Dependency of X-Ray Bright Points and Photospheric Bipoles

Jan 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002mwoc.conf...97s&link_type=abstract

Multi-Wavelength Observations of Coronal Structure and Dynamics -- Yohkoh 10th Anniversary Meeting. Proceedings of the conferenc

Physics

Scientific paper

Using daily Yohkoh SXT full disk images from 1991-2000 we manually identify X-ray bright points (XBPs). We also employ the NSO/KP full disk magnetograms from April 1992-June 2000 to identify the photospheric bipoles with particular magnetic flux and poles separation. We use these data to study statistical properties of XBPs and photospheric bipoles during declining phase of cycle 22 and rising phase of cycle 23. The number of X-ray bright points follows well-known anti-cycle variation, reaching a maximum in 1996 (sunspot minimum). By contrast, the averaged number of photospheric bipoles remains approximately the same during 1992-2000. We see this inconsistency between X-ray and magnetic data as clear indication that anti-cycle variation of XBP number is apparent, not real effect.

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