O I 7772 (~) continuum, showing excess light on spots and shadows on plages
I observed the Sun in two oxygen lines, the O I 7772 and O I 8446, with the modified Sol’Ex (1800 gr/mm grating, band pass filters etc, 42/400 refractor). Unlike 7772 (the triplet), the 8446 (close doublet) doesn’t light up at the limb, as chromosphere. Regardless, I observed and processed the images. For λ7772, I have a full aperture etalon (CWL 775nm, FWHM 25NM, OD4 blocking), but only relatively wide bandpass filter(s) for λ8446, so parasite light is somewhat of an issue. Still, there is an interesting dark feature present in both observations, at around 4 o’clock, close to the edge.
Fe I 7781
Fe I 7781
O I 7772 (~) continuum
O I 7772 concept
O I 7772 concept
O I 8446 (contaminated by iron?)
O I 8446 (contaminated by iron?)
O I 8446 (~) continuum, excess light on plages also, but see at four o’clock the dark patch and the light blanket on the limb
O I 8446, marked
