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The effect of seeing on solar magnetic flux mesurments

Lee, Jeongwoo and Chae, J.-C. and Yun, H. S. and Zirin, H. (1997) The effect of seeing on solar magnetic flux mesurments. Solar Physics, 171 (1). pp. 35-48. ISSN 0038-0938. https://resolver.caltech.edu/CaltechAUTHORS:20201021-171001410

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Abstract

We investigate the influence of seeing upon measurement of magnetic flux of photospheric fields. For this purpose we quantify seeing variation in one day's observation at Big Bear Solar Observatory in terms of the Fried function, a Modulation Transfer Function for the atmospheric seeing. The temporal variation of seeing quality is compared with that of magnetic flux measured in a quiet region with size 5′ x 4′ near the solar disk center. A good correlation is found between the seeing change and apparent evolution of magnetic flux values, implying, as a possibility, that magnetic flux measurement might have been modulated by seeing. Based on a simple model of ensembles of Gaussian magnetic elements we argue that even the net flux as well as the total flux can change due to seeing variation if the magnetograph has a finite detection threshold and if the intrinsic fluxes in one and the other polarities are unbalanced.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1023/a:1004962105138DOIArticle
https://rdcu.be/b8WphPublisherFree ReadCube access
Additional Information:© 1997 Kluwer Academic Publishers. Received 13 August, 1996; in final form 15 October, 1996. We thank Dr C. U. Keller for critical comments. One of us (JL) has been supported by the 1995 KOSEF Post-Doc program and HSY by the Basic Science Research Institute Prograrn, Ministry of Education 1996 (BSRI-96–5408). The work at Big Bear Solar Observatory was supported by NASA under Grant NAGW-1972.
Funders:
Funding AgencyGrant Number
Korea Science and Engineering Foundation (KOSEF)UNSPECIFIED
Ministry of Education (Korea)BSRI-96-5408
NASANAGW-1972
Subject Keywords:Magnetic Flux, Flux Measurement, Modulation Transfer, Modulation Transfer Function, Solar Disk
Issue or Number:1
Record Number:CaltechAUTHORS:20201021-171001410
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20201021-171001410
Official Citation:LEE, J., CHAE, J., YUN, H.S. et al. THE EFFECT OF SEEING ON SOLAR MAGNETIC FLUX MEASUREMENTS. Solar Physics 171, 35–48 (1997). https://doi.org/10.1023/A:1004962105138
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:106202
Collection:CaltechAUTHORS
Deposited By: Rebecca Minjarez
Deposited On:23 Oct 2020 15:06
Last Modified:23 Oct 2020 15:06

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