Geomagnetism and Aeronomy

, Volume 58, Issue 8, pp 1149–1158 | Cite as

On a Magnetic Anomaly in the Umbra of the Following Spot of an NOAA 12192 Active Region

  • A. N. Babin
  • A. N. Koval’
  • Yu. T. TsapEmail author
  • A. V. Borisenko


This paper examines the evolution and morphology of a magnetic anomaly: the appearance and disappearance of a longitudinal magnetic flux with opposite polarity at an area of about 10 arc seconds in the umbra of the following sunspot of an NOAA 12192 active region, which was observed from 21 to 26 October 2014 in the SDO/HMI and SOLIS/VSM magnetograms. Information collected by spacecraft and under on-ground observations including data from the Sun Service of the Crimean Astrophysical Observatory of the Russian Academy of Sciences are analyzed. Based on the methods of observation and determination of longitudinal magnetic fields in SDO/HMI in line FeI 6173.34 Å it was revealed, that combinations of contours appearing due to magnetic force lines inclinations relative to the line-of-sight and line-of-sight velocities can cause a significant undervalue of the magnetic field intensity in magnetograms, but polarity does not reverse. The fine spatial structure, evolution features, close correlation with ultraviolet loops system in SDO/AIA images, “moustaches”, and no temporal and spatial correlation with flares point to a connection between the detected anomaly and the new magnetic flux emergence of opposite polarity in a spot’s umbra at an earlier decay stage. We analyze magnetic force lines reconnection and show that annigilation of the magnetic fields of opposite polarities can take place for many hours at small (~30 km) scales and this fact is verified by observation results. There are additional facts in favor of the cluster model of a solar spot by Severny-Parker.



The authors thank the scientific groups of SDO and SOLIS/VSM projects for the given data, Yu.A. Fursyak for his help in data processing, М.A. Lifshits, and the reviewer for fruitful discussions.

The work is supported partially by Russian Scientific Fund, project no. 16-12-10448, by the Russian Foundation for Basic Researches, project nos. 16-02-00221A and 18-02-00856-a,z, and by the Presidium of Russian Academy of Sciences, project no. 28.


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Copyright information

© Pleiades Publishing, Ltd. 2018

Authors and Affiliations

  • A. N. Babin
    • 1
  • A. N. Koval’
    • 1
  • Yu. T. Tsap
    • 1
    • 2
    Email author
  • A. V. Borisenko
    • 1
  1. 1.Crimean Astrophysical Observatory of the Russian Academy of SciencesNauchnyiRussia
  2. 2.The Central Astronomical Observatory of the Russian Academy of Sciences at PulkovoSt. PetersburgRussia

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