Temporal Evolution of Magnetic Field and Intensity Properties of Photospheric Pores

0461296 - ASÚ 2017 RIV US eng C - Conference Paper (international conference)
Dorotovič, I. - Rybanský, M. - Sobotka, Michal - Lorenc, M. - Barandas, M. - Fonseca, J.M.S.
Temporal Evolution of Magnetic Field and Intensity Properties of Photospheric Pores.
Ground-based solar observations in the space instrumentation ERA. San Francisco: Astronomical Society of the Pacific, 2016 - (Dorotovič, I.), s. 37-41. ASP Conference Series, 504. ISBN 978-1-58381-892-3.
[Ground-based solar observations in the space instrumentation ERA. Coimbra (PT), 05.10.2015-09.10.2015]
R&D Projects: GA ČR(CZ) GA14-04338S
Institutional support: RVO:67985815
Keywords : magnetic field * temporal evolution * photospheric pores
Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

We describe conditions of pore formation in relation to the configuration and intensity of magnetic field, using observations of the SDO/HMI instrument. 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.
Permanent Link: http://hdl.handle.net/11104/0260919