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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/angeo-2019-33
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-2019-33
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Regular paper 19 Mar 2019

Regular paper | 19 Mar 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Annales Geophysicae (ANGEO).

Photospheric vortex flows close to the polarity inversion line of a fully emerged active region

Jean C. Santos1 and Cristiano M. Wrasse2 Jean C. Santos and Cristiano M. Wrasse
  • 1Universidade Tecnológica Federal do Paraná, Curitiba-PR, Brazil
  • 2Instituto Nacional de Pesquisas Espaciais, São José dos Campos-SP, Brazil

Abstract. We report on the occurrence of vortexes in flow fields obtained from the evolution of the line-of-sight component of the photospheric magnetic field in a region around the polarity inversion line of a fully emerged active region. Based on a local linear approximation for the flow field, we identify the presence of critical points and classify them according to the eigenvalues of the Jacobian matrix of the linear transformation. Vortexes are associated to the presence of a particular kind of critical point, known as Attracting Focus. Using this method we identified twelve vortexes in the analyzed period and detected the occurrence of other types of critical points, which indicate the complexity of the flow field around the PIL. The detected vortexes show a clockwise preferred sense of rotation with approximately 67 % of the cases. A geometrical analysis of the velocity structures produced an average value of D = 1.63 ± 0.05 for the fractal dimension, which is very close to the one obtained for isotropic homogeneous turbulence (D = 5/3). This suggests that the flow around the polarity inversion line is turbulent in nature.

Jean C. Santos and Cristiano M. Wrasse
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Jean C. Santos and Cristiano M. Wrasse
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Short summary
We describe a technique used to locate and classify critical points in 2D flow fields at the solar photosphere obtained from the evolution of the line-of-sight magnetic field, in a region close to the magnetic polarity inversion line of a fully emerged active region. We apply this technique to locate a particular kind of critical point is associated to vortex flows, which are considered important since they can twist and interweave the footpoints of flux-tubes and generate magnetic reconnection.
We describe a technique used to locate and classify critical points in 2D flow fields at the...
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