OBSERVING REPORT - April 23 - May 5, 2010

Observers: J. Rybak (PI), H. Schleicher, A. Kucera, P. Gomory, C. Beck

Assistants: O. Wiloth, T. Hederer

Project: Spectroscopy of the quiet solar photosphere: properties of shocks and the acoustic flux generation (OPTICON 2010 VTT project)

Setup: VTT, KAOS, TESOS 42" FoV, 709.04 nm Fe I line, parallel "slit-jaw" light beam (90/10% and 80/20% beam splitter cubes in front of TESOS entrance to feed the ZEISS (Halle) H alpha filter and G-band interference filter, 2 PCO cameras

Weather/Observations: 12 days = 1.5 days for setup installation, 5.5 days with calima, 6.0 days with observations (at least in the morning although some cirrus still present)

Seeing: fairly good conditions for some tens of minutes in 3 days (27/4,3+5/5)

Problems:

• the control computer of the VTT telescope operable only from the control terminal in its room - very inconvenient for positioning

• oil leakage from the old ZEISS H-alpha filter detected

• few forced TESOS repair/remove actions needed after problems with communication to the filter camera

Acknowledgments:

• perfect support of the assistants on duty - O. Wiloth, T. Hederer

• we appreciate that TESOS is in a significantly improved status with almost no artifacts after FF reduction - problems faced during our campaigns in 2006 and 2008 seem to be solved by the repair of the TESOS in 2008 (T. Kentischer). We checked quality of the data during this campaign using dataset acquired on 27/4/2010

• we thank for possibility to use the CHROTEL H-alpha Halle filter for our setup improved the data quality significantly (while CHROTEL was out of operation)

• we point out excellent performance of the KAOS AO system and support of T. Berkefeld during this campaign who even improved KAOS code and performance on base of our experience while observing

• data transfer from PCO cameras to the /dat/tarzan has been speeded up installing a ftp client at the PCO camera computers (T. Hederer)

Remark: more details including proposal, notes, daily logs and a summary of the campaign can be found at a dedicated web page http://www.astro.sk/~choc/open/10_vtt/10_vtt.html.