The mat-track truck was undergoing maintenance, so on March 16 the team stayed at the Eureka Weather Station. The conditions were cloudy, cold and windy. The team took the day off to rest and recuperate for the week ahead.

On March 17, Pierre went to the Ridge Lab with Weather Station staff, and Petra coordinated taking measurements with the Bruker 125HR remotely from the Eureka Weather Station. Kevin and Darby started setting up two new webcams with static IP connections so that they would be ready to install at the Ridge Lab to monitor the trackers inside the GBS domes.

On March 18, Petra investigated network issues affecting data transfer from the 125HR with the help of PEARL Data Manager Yan Tsehtik from Dalhousie University. Kevin and Darby mapped out potential Pandora viewing directions for sky scans, which ideally require unobstructed line-of-sight from the instrument to a distance of at least 30 km away when the instrument is pointed horizontally. One promising potential sky scan direction points across the fjord, over Eureka Sound and Axel Heiberg, the neighbouring island.

Cheers,
Darby Bates
[on behalf of the 2025 Canadian Arctic ACE/OSIRIS Validation Campaign team]