I received observing time at the VTT at Sac Peak for 28.5. - 6.6.1998, weeks 22 and 23 (actual observing starting 30.5.) 13.00 - 19.00 UT. Observations will be carried out in collaboration with B. Lites (HAO, Boulder), K.S. Balasubramaniam (NSO/SP) and M. Sigwarth (KIS, Freiburg) using the Advanced Stokes Polarimeter (ASP) and additional photospheric and chromospheric lines.
The times for the GCT in Tenerife are 15.9. - 21.9.1998, 07.00 - 12.00 UT, the ground-based observer will be P. Suetterlin (Goettingen) providing photospheric and chromospheric line-of-sight magnetic and velocity fields.
For both programs I will be at the EOF at GSFC to prepare and carry out the SoHO/TRACE observations. Thus I will also be available as SOL e.g. for week 23 as well as planner for SUMER, in case it is turned on and participating in this campaign.
The scientific goal and thus the program will be similar to that of last Sept (Campaign #1960), probably modified according to the results of the analysis of last year's data (which is currently under progress). We are aiming at the 3-D structure of sunspots and their surrounding active regions. For this we would like to make 2D maps of the target region in as many heights in the solar atmosphere as possible. The 2 ground-based observatories will provide details of photospheric and chromospheric magnetic and velocity field, CDS and SUMER provide spectra in the TR and corona and EIT and TRACE will provide images, and MDI filter- and magnetograms. We are not aiming at very high time resolution but good spatial coverage and an intermediate time evolution by following the spot over the disk for one week.