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Global analysis of active longitudes of solar X-ray flares
Zhang, L.1,2,3; Mursula, K.1; Usoskin, I.4; Wang, H.2,3
AbstractThere is increasing evidence that various manifestations of solar activity are non-axisymmetric and mainly occur in two preferred longitude ranges, so called active longitudes. We have earlier analyzed the longitudinal occurrence of solar X-ray flares observed by GOES satellites using a specially developed dynamic, differentially rotating coordinate system. In this frame, the longitude distribution shows two persistent preferred longitudes separated by about 180 degrees whose strength alternates in time according to the so called flip-flop phenomenon. Here we make the first global statistical analysis to find the best fitting values for parameters describing the differential rotation of active longitudes of X-ray flares. We find that the new analysis greatly improves the earlier values for the rotation parameters, making them consistent between the three different classes of X-ray flares. The improved parameters also yield a systematically higher level of non-axisymmetry for the longitudinal distribution, thus increasing the statistical significance of the existence of active longitudes. Accordingly, a significant amount of X-ray flares of different classes are produced by the same two active longitudes. We also find a significant difference between the rotation rates in the two solar hemispheres, with active longitudes rotating faster than the Carrington rate in the northern hemisphere and slower than the Carrington rate in the southern hemisphere. (C) 2009 Elsevier Ltd. All rights reserved.
KeywordSolar X-rays Flares Active Longitudes
Indexed BySCI
WOS IDWOS:000287055300011
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Cited Times:9[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Univ Oulu, Dept Phys, FIN-90570 Oulu, Finland
2.Chinese Acad Sci, Natl Astron Observ, Beijing, Peoples R China
3.Chinese Acad Sci, Key Lab Solar Act, Beijing, Peoples R China
4.Univ Oulu, Sodankyla Geophys Observ, FIN-90570 Oulu, Finland
Recommended Citation
GB/T 7714
Zhang, L.,Mursula, K.,Usoskin, I.,et al. Global analysis of active longitudes of solar X-ray flares[J]. JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS,2011,73(2-3):258-263.
APA Zhang, L.,Mursula, K.,Usoskin, I.,&Wang, H..(2011).Global analysis of active longitudes of solar X-ray flares.JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS,73(2-3),258-263.
MLA Zhang, L.,et al."Global analysis of active longitudes of solar X-ray flares".JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS 73.2-3(2011):258-263.
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