Total sunspot number calculation based on flare production potential of sunspot groups: reconstruction of SSN and its relation to some geomagnetic indices

Authors : Ahmet Burak KARSLIOĞLU, Burçin DÖNMEZ, Ali KILÇIK

Pages : 187-195

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Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :In this study, we modified the previously introduced X-ray flare production potential insert ignore into journalissuearticles values(FPP); of each modified Zurich sunspot group based on its X-ray flare peak flux. Then, using these FPPs, the daily total sunspot number insert ignore into journalissuearticles values(Zurich number); calculation equation was modified; thus, new sunspot number data insert ignore into journalissuearticles values(CRz); were produced. We also compared ISSN and CRz with some geomagnetic indices insert ignore into journalissuearticles values(Dst, the maximum CME speed, and Ap indices);. We found that the CRz data describe the geomagnetic indices quite well compared to ISSN. By using the regression equation between CRz and the sunspot area, the CRz dataset was recalculated back to 1874. Those reconstructed datasets were compared to observational data, and it was found that reconstructed and observed monthly datasets show very good agreement. The only small differences exist in maxima and minima of cycles.
Keywords : Sunspot, sunspot classification, sunspot number, solar X ray flares