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Title: | Correlation between sunspot number and Ca II K emission index |
Authors: | Bertello, L Pevtsov, A Tlatov, A Singh, J |
Keywords: | Chromosphere: active Magnetic fields: chromosphere Solar irradiance |
Issue Date: | Nov-2016 |
Publisher: | Springer |
Citation: | Solar Physics, Vol. 291, No. 9, pp. 2967-2979 |
Abstract: | Long-term synoptic observations in the resonance line of Ca II K constitute a fundamental database for a variety of retrospective analyses of the state of the solar magnetism. Synoptic Ca II K observations began in late 1904 at the Kodaikanal Observatory in India. In the early 1970s, the National Solar Observatory (NSO) at Sacramento Peak (USA) started a new program of daily Sun-as-a-star observations in the Ca II K line. Today the NSO is continuing these observations through its Synoptic Optical Long-term Investigations of the Sun (SOLIS) facility. These different data sets can be combined into a single disk-integrated Ca II K index time series that describes the average properties of the chromospheric emission over several solar cycles. We present such a Ca II K composite and discuss its correlation with the new entirely revised sunspot number data series. For this preliminary investigation, the scaling factor between pairs of time series was determined assuming a simple linear model for the relationship between the monthly mean values during the duration of overlapping observations. |
Description: | Restricted Access © Springer The original publication is available at springerlink.com http://dx.doi.org/10.1007/s11207-016-0927-9 |
URI: | http://prints.iiap.res.in/handle/2248/7191 |
ISSN: | 1573-093X |
Appears in Collections: | IIAP Publications |
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Correlation between sunspot number and Ca II K emission index.pdf Restricted Access | 1.08 MB | Adobe PDF | View/Open Request a copy |
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