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Reduced Microwave Brightness Temperature in a Sunspot Atmosphere Due to Open Magnetic Fields

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Abstract

Motivated by dark coronal lanes in 284 Å extreme-ultraviolet (EUV) observations from the Extreme-ultraviolet Imaging Telescope on board the Solar and Heliospheric Observatory (SOHO/EIT), we construct and optimize an atmosphere model of the active region (AR) 8535 sunspot by adding a cool and dense component in the volume of plasma along open field lines determined using the potential-field source-surface (PFSS) extrapolation. Our model qualitatively reproduces the observed reduced microwave brightness temperature in the northern part of the sunspot in Very Large Array (VLA) observations from 13 May 1999 and provides a physical explanation for the coronal dark lanes. We propose the application of this method to other sunspots with such observed dark regions in the EUV or soft X-rays and with concurrent microwave observations to determine the significance of open field regions. The connection between open fields and the resulting plasma temperature and density change is of relevance for slow solar wind source investigations.

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Acknowledgements

Magnetic field and EUV data are provided by the SOHO/MDI and EIT consortia. SOHO is a project of international cooperation between ESA and NASA. Karl G. Jansky Very Large Array (VLA) is a component of the National Radio Astronomy Observatory, which is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. A.V. is supported by the ERDF Postdoctoral Research Aid Project No. 1.1.1.2/16/1/001, Research Application No. 1.1.1.2/VIAA/1/16/079 “Understanding Solar Magnetic Atmosphere” (USMA). A.V. and B.I.R. are thankful to the Ventspils City Council for support.

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Authors and Affiliations

  1. Ventspils International Radio Astronomy Centre, Ventspils University of Applied Sciences, Inzenieru iela 101, Ventspils, LV-3601, Latvia

    A. Vrublevskis & B. I. Ryabov

  2. Space Vehicles Directorate, Air Force Research Laboratory, Kirtland AFB, Albuquerque, NM, USA

    S. M. White

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  1. A. Vrublevskis
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Vrublevskis, A., Ryabov, B.I. & White, S.M. Reduced Microwave Brightness Temperature in a Sunspot Atmosphere Due to Open Magnetic Fields. Sol Phys 296, 144 (2021). https://doi.org/10.1007/s11207-021-01891-5

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