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Determination of the chromospheric quiet network element area index and its variation between 2008 and 2011

Research in Astronomy and Astrophysics 2012年第2期12卷 201-211页

作者： Jagdev Singh Ravindra Belur Selvendran Raju Kumaravel Pichaimani muthu priyal Thambaje Gopalan Priya Amareswari Kotikalapudi Indian Institute of Astrophysics Koramangala

In general, it is believed that plages and sunspots are the main contribu- tors to solar irradiance. There are small-scale structures on the Sun with intermediate magnetic fields that could also contribute to solar irradiance, but it has not yet been quantified how many of these small scale structures contribute and how much this varies over the solar cycle. We used Ca II K images obtained from the telescope at the Kodaikanal observatory. We report a method to separate the network elements from the background structure and plage regions, and compute the changes in the network element area index during the minimum phase of the solar cycle and part of the as- cending phase of cycle 24. The measured area occupied by the network elements is about 30% and the plages cover less than 1% of the solar disk during the observation period from February 2008 to 2011. During the extended period of minimum activity, it is observed that the network element area index decreases by about 7% compared to the area occupied by the network elements in 2008. A long term study of the network element area index is required to understand the variations over the solar cycle.

关键词： Sun: network - Sun: Ca-K - Sun: solar cycle

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Variation of Small Scale Magnetic Fields Over a Century using Ca-K Images as Proxy

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Research in Astronomy and Astrophysics 2023年第4期23卷 172-183页

作者： Jagdev Singh muthu priyal B.Ravindra Luca Bertello Alexei Pevtsov Indian Institute of Astrophysics II BlockKoramangalaBengaluru–560034India National Solar Observatory 3365 Discovery DriveThird FloorBoulderCO 80303USA

A combined uniform and long-time series of Ca-K images from the Kodaikanal Observatory,Mount Wilson Observatory and Mauna Loa Solar Observatory was used to identify and study the Ca-K small-scale features and their solar cycle variations over a *** small scale features are classified into three distinct categories:enhanced network,active network and quiet *** these features show that their areas vary according to the11 yr solar *** relative amplitude of the Ca-K network variations agrees with that of the sunspot *** total area of these small-scale features varies from about 5%during the minimum phase of the solar cycle to about20%during its maximum phase.

关键词： Sun activity-Sun chromosphere-(Sun:)sunspots

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维普期刊数据库

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ERRATUM: “Determination of the chromospheric quiet network element area index and its variation between 2008 and 2011” (RAA, Vol. 12, p.201 [2012])

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Research in Astronomy and Astrophysics 2012年第4期12卷 472-472页

作者： Jagdev Singh Ravindra Belur Selvendran Raju Kumaravel Pichaimani muthu priyal Thambaje Gopalan Priya Amareswari Kotikalapudi Indian Institute of Astrophysics Koramangala Bengaluru-560 034 India

As a result of the authors＇ error, the paper ＂Determination of the chromospheric quiet network element area index and its variation between 2008 and 2011＂ by Singh, J. et al. （RAA, Vol. 12, p.201 [2012]） contains errors in page 206. In the original article, the top right and bottom images were inadvertently interchanged in Figure 5. The correct sequence of images is shown in this erratum. Figure caption and details about the images remain unchanged.

关键词： Sun:network—Sun:Ca-K—Sun:solar cycle

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维普期刊数据库

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