It was a sunny day today with some thick cirrus clouds near the horizon.

Today, the full disk of the Sun was above the horizon and was visible from AStrO. The FTS instruments made preliminary measurements for a little over two hours around solar noon. The system of beam sharing was tested and we found that there needs to be a slight change in the configuration of PARIS to allow greater access to the suntracker controls. The PARIS setup was changed and the alignment will be verified tomorrow.

The clouds and haze near the horizon did not cause too many problems for the measurements. The conditions, however, were right for viewing of another beautiful atmospheric phenomenon - sundogs. These patterns appeared to the left and right of the Sun due to the refraction of sunlight by hexagonal column ice crystals in the atmosphere. These appear at a constant distance and move across the sky with the Sun. They were visual treat for most of the day.

It was a good day for the DOAS spectrometer. After yesterday's hiccough, there was significant progress made today. The instrument was installed on its platform in the UoT lab (formerly the east lab). It was tested and then the new plywood and plexiglass "dome" was installed over the hatch. It is currently taking data. The temperature of the instrument's thermal environment is being optimised to eliminate frost formation on the plexiglass window and maximize performance of the CCD detector.

Richard B. had another successful night of lidar measurements. The MAESTRO took zenith sky and solar measurements during the day while the SPS measured in zenith only. No progress was made with the solar tracker. Also Andre and Charlene launched the first of the ozonesondes for the campaign this evening with the synoptic radiosonde flight at 23:15 UTC. The Raven balloon made it up to 6.7 mbar (32.594 km).

Best regards,
Kaley.