Sunday, 21 May 2017

AR12656 in Ha - 21st May

Using the 0.2m Airylab HaT I was able to zoom in on the region around AR12656.  This image shows the central sunspot is quite difficult to see at this wavelength. This is because the double stacked Daystar Quark used has reduced continuum leakage in the wings of the Ha line, which gives a higher contrast of chromosphere features.  The sunspot itself is a feature of the photosphere which is why it is difficult to see.  The camera used was the PGR Chameleon 3 with 2x2 binning to give a nice short 2ms exposure time to freeze the seeing conditions.