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Solitary Facular Knot: Fountain Magnetic Structure and Temperature Profile

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Abstract

Based on the previously proposed steady-state 3D model of a solar facular knot, we have developed its modified version in which the solitary nature of the facular object is reflected: its magnetic field is sharply bounded in the radial direction. The facula temperature profile calculated for the steady state of such a magnetic structure is compared with the high-resolution filtergram taken in the photospheric TiO 7057 Å line at Big Bear Solar Observatory on June 19, 2017, at the New Solar Telescope (with a 1.6-m aperture). The image shows two closely spaced very dark micropores with a diameter \({\sim}300\) km each. The micropores are surrounded by a fan of thin, light, radially elongated fibrils resembling a sunspot penumbra. The theoretically calculated \(T\) profile of the facular knot completely reproduces these morphological features of the object being modeled.

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ACKNOWLEDGMENTS

I am grateful to the administration of the Big Bear Solar Observatory for the opportunity to use high-resolution images at the Observatory site https://www.bbso.njit.edu/~vayur/NST_catalog/2017/06/19/images/bbso_tio_pcosr_20170619_170005.png .

Funding

I thank the Russian Foundation for Basic Research for support (grant no. 18-02-00168). I also thank the Ministry of Science and Higher Education of the Russian Federation for its support by grant 075-15-2020-780 (N13.1902.21.0039).

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Authors and Affiliations

  1. Pulkovo Astronomical Observatory, Russian Academy of Sciences, Pulkovskoe sh. 65, St. Petersburg, 196140, Russia

    A. A. Solov’ev

  2. Kalmyk State University, Elista, Russia

    A. A. Solov’ev

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  1. A. A. Solov’ev
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Correspondence to A. A. Solov’ev.

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Translated by V. Astakhov

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Solov’ev, A.A. Solitary Facular Knot: Fountain Magnetic Structure and Temperature Profile. Astron. Lett. 46, 741–750 (2020). https://doi.org/10.1134/S1063773720110067

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