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The smallest observable elements of magnetic flux

Wang, Jingxiu and Zirin, Harold and Shi, Zhongxian (1985) The smallest observable elements of magnetic flux. Solar Physics, 98 (2). pp. 241-253. ISSN 0038-0938. doi:10.1007/bf00152458.

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We have followed disappearing elements of magnetic flux to determine the smallest elements detectable with the Big Bear videomagnetograph. All the elements followed were disappearing through interaction with elements of opposite polarity. The last remaining visible segment of magnectic field of such features can be used to infer the total magnetic flux of these and other small flux elements visible on the magnetograms. We used both photographic and digital videomagnetograms combining 4096 Zeeman frames made at Big Bear. Fifteen elements were measured near the vanishing point, in a 2–8 hr period. The minimum observable fluxes fall in the range of 1.0 × 10¹⁶ to 1.4 × 10¹⁷ Mx, and the apparent size of these elements is in the range of 1 to 9 square arc sec. The process of disappearance appears to be a smooth one. The smallest detectable elements of network field and ephemeral regions (ER) appear to be the same as the small intra-network (IN) field elements. The present limit is still instrumental; elements smaller than 1 × 10¹⁶ would not have been detected.

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Additional Information:© 1985 Kluwer Academic Publishers. Provided by the NASA Astrophysics Data System. Received 8 November, 1984; in revised form 21 May, 1985. We are indebted to Sara F. Martin for obtaining the observations. This work was supported by the NSF under ATM 8211002 and by NASA under NGL 05-002-034. J. Wang and Z. Shi visited Caltech through the auspices of the Academia Sinica and Caltech.
Funding AgencyGrant Number
NASANGL 05-002-034
Subject Keywords:Magnetic Flux; Opposite Polarity; Small Element; Apparent Size; Detectable Element
Issue or Number:2
Record Number:CaltechAUTHORS:20200602-130611690
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Official Citation:Wang, J., Zirin, H. & Shi, Z. The smallest observable elements of magnetic flux. Sol Phys 98, 241–253 (1985).
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:103644
Deposited By: Tony Diaz
Deposited On:02 Jun 2020 20:12
Last Modified:16 Nov 2021 18:23

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