Thus, sunspots show different dynamic phenomena from plages, which differ again from the quiet Sun. We propose to observe all 3 types of features with as similar settings as possible in order to carry out a comparative analysis. The prime targets of the JOP are the quiet Sun at or close to the centre of the solar disk, as well as an active region that is in the process of crossing the central meridian. If possible the active region should include a sunspot, or at least large pores. To be certain that both instruments are indeed seeing the same solar region we propose to make CDS movies with an open slit, at least in the quiet sun.
Solar rotation is to be compensated.
We also propose a 2 hour test run a few days beforehand to test the observing sequences, so that they can be improved before the main observations, if necessary. High resolution MDI magnetograms of the regions under study will be of great value for determining the relationship of the brightenings to the underlying magnetic field. EIT images will help to show the relationship to the hotter coronal plasma. Ideally, we would like to perform only the 2 hours test run at the end of week 16 and the actual observations during week 17 and if necesssary beginning of week 18. Full resolution images of all 4 spectral lines.