Tuesday, October 17, 2017

All Sky Photometer for NearSys Station, 17 October 2017

In an attempt to find out why the all sky photometer can show spikes before and after local noon, I tried another experiment today. This time the photometer was tilted and oriented to place it's DB9 connector towards the south.

The results look much better, inspite of the intermittent cloud cover this afternoon. In addition, the sky has grown hazy again.

I will need to create a consistent angle of tilt before making this a standard procedure.


Monday, October 16, 2017

All Sky Photometer for NearSys Station, 16 October 2017

In an effort to determine what may be causing the unusual spikes in my Photometer results, I've run the Photometer almost evryday in a different orientation. Today, the Photometer was oriented with the DB9 connector pointing south.

This time the data shows two spikes, one before local noon and the other after local noon. But unlike prior data, the spikes are for different colors - blue in the morning and red in the afternoon.

Obviously, I have more tests to run. Perhaps I'll tilt the Photometer next.

Sunday, October 15, 2017

All Sky Photometer Data for NearSys Station, 15 October 2017

Photometer data was collected starting at 6:00 AM MDT. The sky was clear, but it was also a frosty morning. The photometer has been left out all night.

The blue spike is unique, it has never been observed before. It was also determined the photometer battery has a low voltage. Either frost or low voltage may have contributed to the blue spike. Another test will be necessary to investigate this matter.

The photometer was oriented with its DB9 connector facing North.


Sky and Ground Thermal Observation for NearSys Station, 15 Octiber 2017

Ground and Sky ovservations were made at 4:30 PM MDT. The ground temperature was 28 *F and the cloud temperature was -25*F. Assuming a dry adiobatic lapse rate of 5.4 *F per 1,000 feet, the cirrus clouds above NearSys Station had a base of 9,800 feet.

The Boise METAR reports clear skies up to 12,000 feet.

In this case, cirrus clouds are 2,000 higher than indicated.

A RGB image of cirrus clouds above NearSys Station.

The Seek Reveal thermal image.

Background Neutron Radiation for NearSys Station, 15 October 2017

After 177 hours of monitoring, nine neutrons were detected. That's an exposure rate of 2.5 microrem per hour of thermal neutron radiation.

Friday, October 13, 2017

Visibility for NearSys Station, 13 October 2017

Based on images collected at an altitude of 400 feet, the visibility is 40 miles.
Looking East. Clouds obscure the Boises.

Looking North

Looking South, some light snow is visible on the highest peaks of the Owyhees.

Looking West

UAVSonde Data for NearSys Station, 13 October 2017

UAVSonde data collected at 5:35 PM MDT. Here are the data.

Altitude: 2,250 feet
Temperature: 57 *F
Relative Humidity: 100%
Pressure: 942.9 mb

Altitude: 2,591 feet
Temperature: 50 *F
Relative Humidity: 100%
Pressure: 928.0 mb