Please use this identifier to cite or link to this item: http://hdl.handle.net/2248/7134
Title: Variation of supergranule parameters with solar cycles: results from century-long Kodaikanal digitized Ca II K data
Authors: Chatterjee, Subhamoy
Mandal, Sudip
Banerjee, D
Keywords: Astronomical databases;Miscellaneous – methods;Data analysis – Sun;Chromosphere – Sun;Faculae, plages – Sun;Granulation – techniques;Image processing
Issue Date: 1-Jun-2017
Publisher: IOP Publishing
Citation: The Astrophysical Journal, Vol. 841, No. 2, 70
Abstract: The Ca ii K spectroheliograms spanning over a century (1907–2007) from Kodaikanal Solar Observatory, India, have recently been digitized and calibrated. Applying a fully automated algorithm (which includes contrast enhancement and the "Watershed method") to these data, we have identified the supergranules and calculated the associated parameters, such as scale, circularity, and fractal dimension. We have segregated the quiet and active regions and obtained the supergranule parameters separately for these two domains. In this way, we have isolated the effect of large-scale and small-scale magnetic fields on these structures and find a significantly different behavior of the supergranule parameters over solar cycles. These differences indicate intrinsic changes in the physical mechanism behind the generation and evolution of supergranules in the presence of small-scale and large-scale magnetic fields. This also highlights the need for further studies using solar dynamo theory along with magneto-convection models.
Description: Restricted Access
URI: http://hdl.handle.net/2248/7134
ISSN: 0004-637X
???metadata.dc.rights???: © The American Astronomical Society
???metadata.dc.relation.uri???: https://doi.org/10.3847/1538-4357/aa709d
Appears in Collections:IIAP Publications

Files in This Item:
File Description SizeFormat 
Variation of Supergranule Parameters with Solar Cycles.pdfRestricted Access6.94 MBAdobe PDFView/Open    Request a copy


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.