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Paper: Temporal Evolution of Magnetic Field and Intensity Properties of Photospheric Pores
Volume: 504, Coimbra Solar Physics Meeting: Ground-based Solar Observations in the Space Instrumentation Era
Page: 37
Authors: Dorotovič, I.; Rybanský, M.; Sobotka, M.; Lorenc, M.; Barandas, M.; Fonseca, J. M.
Abstract: We describe conditions of pore formation in relation to the configuration and intensity of magnetic field, using observations of the SDO/HMI instrument, which observes the photosphere in the visible continuum and simultaneously the magnetic field with a spatial resolution of better than 1''. An area with a diameter of 35'' containing 6 pores during the period from October 10, 2013, 22:01:30 UT to October 11, 2013, 20:01:30 UT is selected from the HMI full-disk images. We analyze the temporal evolution of the area and brightness of the pores (time step 15 minutes), their statistics, and in parallel a time-sequence of the line-of-sight magnetic field intensity and its correlation with the area and brightness. We find that the pores become visible when their intensity decreases below 0.85 of the photospheric surrounding intensity and the magnetic field increases to 650 G in the HMI measurements. We determine the mean synodical rotational speed of the pores to be 14.44°/24 hours, which is 1° more than the tabular value. Positions of maximum magnetic field precede the positions of the pores in the direction of rotation for the positive polarity and lag behind it for the negative polarity.
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