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The relation of Ca II K features to magnetic field

Nindos, Alexander and Zirin, Harold (1998) The relation of Ca II K features to magnetic field. Solar Physics, 179 (2). pp. 253-268. ISSN 0038-0938. doi:10.1023/a:1005046114362.

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We studied quantitatively the relation between the intensity of Caii K-line bright features and the intensity of the associated magnetic elements using two data sets obtained at the Big Bear Solar Observatory. Both network and intranetwork (IN) structures were considered. Magnetic field changes always affected the K-line emission; for example, the appearance of new bipoles was always followed by enhanced K-line emission. There is an almost linear correlation between the K-line intensity and the magnetic field strength of the stronger network elements (elements with absolute field strength higher than 11–19.5 G). We identified two classes of intranetwork K-line elements: magnetic and non-magnetic ones. The number of the magnetic K-line IN elements above a 1-sigma threshold was only 5%–10% of the number of the non-magnetic ones. The magnetic K-line IN elements were almost 3 to 4 times brighter compared to the non-magnetic elements. On the other hand, the non-magnetic elements were moving with typical velocities of 35–40 km s⁻¹ while the velocities of the magnetic K-line elements were of the order of 1 km s⁻¹.

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Additional Information:© 1998 Kluwer Academic Publishers. Received 2 September 1997; accepted 17 October 1997. We would like to thank the staff of the Big Bear Solar Observatory for their support. This work was supported by NASA grants NAG5-2782 and NAGW-1972 and NSF grant ATM-9525971. We would like to thank Profs. P. Goode and H. Wang and Dr C. Denker for stimulating discussions. AN also wants to thank Prof. C. E. Alissandrakis and Dr A. Georgakilas for instructive discussions before his arrival at Caltech.
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Subject Keywords:Magnetic Field, Field Strength, Linear Correlation, Magnetic Field Strength, Field Change
Issue or Number:2
Record Number:CaltechAUTHORS:20200728-152911214
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Official Citation:Nindos, A., Zirin, H. The relation of Ca II K features to magnetic field. Solar Physics 179, 253–268 (1998).
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:104619
Deposited By: Rebecca Minjarez
Deposited On:29 Jul 2020 15:58
Last Modified:16 Nov 2021 18:33

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