All Hα images, with overplotted magnetic field contours taken by HMI/SDO, acquired from 2023 up today by INAF - Catania Astrophysical Observatory are available in this page. Full-disc image of the Sun at the center of the Hα line (656.28 nm ± 0.25 nm) is combined with HMI measurements of the line-of-sight component of the photospheric magnetic field. Positive magnetic fields are shown in red contours, while negative magnetic fields are shown in blue. The contours correspond to +/- 200 G and +/- 1000 G. The images are recorded with a size of 2048 x 2048 pixels and a dynamic range of 16 bit.
The images are stored thanks to the support of the Italian Center for Astronomical Archives of INAF.
Hα images, with overplotted magnetic field contours taken by HMI/SDO, in a specific range of time can be requested following the instructions reported here.