Results of the spectral inversions for the photospheric Fe I 6173 Å line. This snapshot shows physical maps of active region NOAA 12673 at 11:48 UT on the 6 September 2017 just before the X9.3 flare. The wholetime series consists of 35 maps at a 12-min cadence starting at 07:48 UT: normalized intensity I∕I0 , masks ofpenumbra (gray) and umbra (black), horizontal component of the magnetic flux density Bhor , LOS velocity vLOS, vertical component of the magnetic flux density Bz, and total flux density (top-left to bottom-right). The associated movie is available online.
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