Overcast early in the morning but clouds cleared by 0930. Temperature dropped to +1F overnight, according to airport weather station, but was up to +9F with mostly clear skies by 0900. An IOP has been called for an ephemeral fog starting today at noon.
ISS1 – all systems running nominally again today with profiler status: @0923 100m: 5.09A @50V & 1.846A @ 32V, and @0930 150m rass: 4.15A @ 50V & 1.892 A @ 32 V. Below is are the temperature curves for the last 7 days taken at 1641 this afternoon.
Temperatures in the amplifier enclosure are varying between +9C and +36C over the last few days. The downward trend corresponds with the colder temperatures seen. The temperatures are seen to start increasing around 1000 in the morning as the sun gets higher while cooling starts in the late afternoon, ~1600. There is an unusually narrow ‘heating’ spike seen around 1000 on 02-02; nothing to worry about, but an odd piece of data worth noting. The profiler currents were also noted for the 100m mode at 1640 this afternoon to be 4.76A @ 50V & 1.835A @ 32V. We continue to see lower currents, especially on the 50 VDC supply to the power amplifier modules, with warmer enclosure temperatures.
ISS2 – The lidar was not running this morning, however the lens had been rotated and was pointing vertical, so at least some sunlight reached the lens and may help with the frosting issue. Lidar was functional by the start of the IOP, though using lower resolution scans. The internal RH was noted to be 13% around 1100 this morning. The lens was not visible so no update on the lens frosting issue.
ISFS – No issues today - all sites operational. It appears that the AC line power was restored to the Midway site this morning (batteries charged up and Icharge current went positive). We were able to get the soil sampling T-bar tool repaired at a local welding shop as well.
Sounding – The first IOP sounding conducted without any problems. During the second sounding, after the balloon was filled, a whistling sound was heard coming from the balloon. A pin hole leak was found at the top of the balloon so the balloon was discarded, a second balloon filled, and the sounding launched on time at 1615.
Sebastian and Alexi were at the sounding site as well, prepping the tether sonde for operations.
1 Comment
Elizabeth Bernhardt
Just a reminder with enclosure temperature, I did start running one of the AC units beginning on the 30th, so the cooler temps inside can also be from this. The cooler weather does help though.