Hallelujah, we got through all the DA8 filters...

There were ice crystals falling at the lab when Michael arrived. He ran the lidar from 1 AM to 6:30 AM under reasonable conditions. Soon he will have to shift his start time earlier because the days are getting longer.

There was a little cloud on the horizon when we got up to the lab. It was cold (-38 C) and there was very little wind.

There was a little frost on the corner of the SAOZ window so Keith, Annemarie and I readjusted the weights on the corners of the DOAS and SAOZ dome covers. We tried to shim them so that there were no gaps between the weather stripping and the hatch surface. The SAOZ instrument temperature was almost 38 C so we turned off the heaters. There was a little frost when we checked the window at the end of the day so I scraped it off and we reseated the window. The instruments continued taking measurements throughout the day.

Richard M., Paul and Keeyoon had a great day measuring with PARIS-IR and the DA8. They started measuring at 10:15 AM and went until 4:00 PM when the Sun finally disappeared into the clouds. There was uniform haze covering the Sun for most of the afternoon but this did not significantly impede the measurements.

MAESTRO made direct sun measurements in the morning and zenith sky measurements in the afternoon. SPS spent the day making zenith sky observations. Jennifer took a "day off" at the station to recharge her batteries. Tom continued to work on the MAESTRO analysis software.

The daily ozonesonde was launched at 19:45 UTC to try to better synchronize the middle of the sonde measurement with an ACE overpass at 21:11 UTC. The occultation was about 110 km from AStrO/PEARL. The sonde only got to 14.1 mbar. Tom came closest with a guess of 14.0 mbar.

Richard M. and Keeyoon came down to the station this evening to have dinner and to do their laundry. At about 7:30 PM, they were getting a bit antsy to return to the lab. Maybe they are not used to having dinner with so many people or maybe it was having to share one internet connection that made them want to leave.

Best regards,
Kaley.