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

Sky and Ground Thermal Observation for NearSys Station, 13 October 2017

Ground and sky observations were made at 6:20 AM MDT using a Week Reveal thermal imager.

The ground had a temperature of 22 *F. The sky has broken stratonimbus and NearSys Station is experiencing light, intermittent rain. The cloud temperature is 7* F.

Assuming a wet adiobatic lapse rate (since it's raining) of 2.7 *F per 1,000 feet (the actual value depends on the temperature), the height to the cloud base is 5,500 feet. The Boise METAR reports broken clouds at 6,000 feet.


All Sky Photometer Data for NearSys Station, 12 October 2017

Photometer data was collected beginning at 6:00 AM MDT. This time the DB-9 connector of the photometer was oriented towards the east. The red channel shows a switch from being the lowest value to the highest as the sun approached due south.

After it stops raining, I will try orienting the photometer towards the south and the north.


Wednesday, October 11, 2017

All Sky Photometer Data for NearSys Station, 10 October 2017

Photometer data were collected beginning at 6:00 AM MDT. The morning orange spike is back. The DB-9 connector was facing west. I'll change its direction next time and see how that effects the spike. A change was made in data collection. Now all data is recorded at 10-bit resolution and recorded as one word variables (rather than as one byte variables). Recording as larger variables makes it easier and faster to format the data.
The presence of afternoon clouds is responsible for the spikiness seen in the data after 1:00 PM. 

Sunday, October 8, 2017

Visibility Report for NearSys Station, 8 October 2017

Based on UAVSonde images taken at 400 feet AGL, the visibility at NearSys Station is over 50 miles.

Looking East

Looking North


Looking West

Looking South

UAVSonde Data for NearSys Station, 8 October 2017

UAVSonde data was collected at 8:30 AM. Here are the data.

Altitude: 2,453 feet
Temperature: 54 *F
Relative Humidity: NA
Pressure: 917.6 mb

Altitude: 2,696 feet
Temperature: 50 *F
Relative Humidity: NA
Pressure: 916.9 mb

The GPS reciever tilted during the flight and some altitude reports were lost.

Sky and Ground Thermal Observation for NearSys Station, 8 October 2017

At 8:30 AM, skies over NearSys Station were mostly cloudy. The ground temperature was 23 *F and the cloud temperature was 9 *F. Assuming a dry adiobatic lapse rate of 5.4 *F per 1,000 feet, the cloud base was 2,600 feet AGL.

The Boise METAR reported broken clouds at 5,000 feet AGL.

Thermal infrared image taken of the cumulus above NearSys Station

Color image of the broken cumulus above NearSys Station

Sunday, October 1, 2017

Sky and Ground Thermal Observation for NearSys Station, 1 October 2017

I don't normally make two observations this close in tine, but felt I had too great an opportunity to pass up.

The skies above NearSys Station are broken cumulus. A check of the METAR from BOI (the Boise Airport) indicates cumulus clouds with altitudes between 4,000 and 6,000 feet.

The ground temperature at NearSys Station is 44 *F. The temperature of the cumulus clouds is 13 *F. Assuming a dry adiobatic lapse rate of 5.4 *F indicates a cloud height of 5,700 feet.

I need to see if every measure is within this level of accuracy.



Saturday, September 30, 2017

September Temperature and Precipitation for NearSys Station

The temperature is definitely cooling down in September. Overall, it's been a dry month, except towards the end.



Friday, September 29, 2017

Sky and Ground Thermal Observation for NearSys Station, 29 September 2017

At 7:00 PM MDT the skies over NearSys Station were mostly cloudy with a mix of high altitude cirrus and altocumulus.

The ground temperature was 46 *F. The temperature of the altocumulus was 5 *F And the temperature of the cirrus was -21 *F.

Assuming a dry adiobatic lapse rate of 5.4 *F/1,000 feet, the base of the altocumulus was 7,600 feet AGL. The base of the cirrus was then at 12,400 feet.

I need to determine at some point what calibration factor I need to apply.

Thermal Infrared Image of the Clouds above NearSys Station.

Visible Image of the Clouds above NearSys Station.


Visibility for NearSys Station, 29 September 2017

Based on UAV images taken at 400 feet, the visibility at NearSys Station is at least 50 miles, possibly less towards the North.

Looking East

Looking North

Looking South

Looking West

UAVSonde Data for 29 September 2017

UAVSonde data was collected at 5:00 PM MDT. Here are the data.

Altitude: 2,296 feet
Temperature: 86 *F
Relative Humidity: NA
Pressure: 919.1 mb

Altitude: 2,640 feet
Temperature: 82 *F
Relative Humidity: NA
Pressure: 914.8 mb

Background Neutron Radiation for NearSys Station, 29 September 2017

After 166 of monitoring, only three thermal neutrons were detected. That's an average background level of 3 microrems per hour.


Wednesday, September 27, 2017

All Sky Photometer Data for Nearsys Station, 26 September 2017

Photometer data were collected beginning at 6:00 AM MDT. The orange spikes are back, so I need to document the orientation of the LED Photometer as a part of my data collection routine.


Sunday, September 24, 2017

Sky and Ground Thermal Observation for NearSys Station, 24 Septemver 2017

At 5:00 PM MDT, the skies over NearSys Station were partly cloudy with cumulus clouds. The ground temperature was 42 *F and the temperature of an overhead cumulus cloud was 11*F.

Assuming a dry adiobatic lapse rate of 5.4*F per 1,000 feet, the base of the cumulus clouds over NearSys Station is 5,700 feet AGL.

Thermal Image

RGB Image

Saturday, September 23, 2017

Visibility for NearSys Station, 23 September 2017

Based on UAV images taken at 400 feet AGL, the visibility at NearSys Station is at least 50 miles.

Looking East

Looking North

Looking South

Looking West

UAVSonde Data for NearSys Station, 23 September 2017

UAVSonde data was collected at 6:30 PM MDT. Here are the data.

Altitude: 2,309 feet
Temperature: 75 *F
Relative Humidity: 17%
Pressure: 924.3 mb

Altitude: 2,673 feet
Temperature: 76 *F
Relative Humidity: NA
Pressure: 919.1 mb

Friday, September 22, 2017

Sunspot Observation for NearSys Station, 22 September 2017

Only a single sunspot was visible as the sun set behind a cloud bank. The penumbra had a calculated diameter of 11,107 miles and the umbra a diameter of 4,859 miles. Compare this to Earth's diameter of 7,920 miles.
The original image. The sunspot is located near the edge of the 9:00 position.

The image after thresholding.

Background Neutron Radiation for NearSys Station, 22 September 2017

In 142.5 hours of observation, five neutrons were detected. That's a background level of 1.75 microrem of thermal neutron radiation.


Saturday, September 16, 2017

Background Neutron Radiation for NearSys Station, 15 September 2017

After 118.5 hours of monitoring, three neutrons were detected. This is a background of 1.2 microrems per hour.


Sky and Ground Thermal Observation for NearSys Station, 16 September 2017

This morning at 8:00 AM MDT the skies were clear of clouds except for very minor streak of cirrus. The ground temperature was 17 *F And the sky temperature was -43 * F. At a difference of 60 degrees and assuming a 5.4 degree dry lapse rate, the altitude the sky temperature was measured is 11,100 feet.

Thermal image of the sky overhead NearSys Station.

This afternoon at 8:00 PM MDT, the sky was clouded over with nearly 100% altostratus (some high level cirrus was visible through gaps). The ground temperature was 34 *F And the sky temperature was -21 *F. Assuming a lapse rate of 5.4 *F, the altitude at which the sky's temperature was measured is 10,200 feet.

Thermal image over NearSys Station this evening. The sky was nearly 100% overcast with altostratus.

RGB image of the sky overhead of NearSys Station this evening.

All Sky Photometer Data for NearSys Station, 16 September 2017

Photometer data were collected beginning at 6:00 AM MDT. Note that there are no spikes in the orange band before and after local noon. This time the photometer was rotated 90 degrees relative to the other days data were collected. I need to see if the data maintains this result. If so, then possibly glare from neighboring LEDs are effecting the orange LED.

Visibility for NearSys Station, 16 September 2017

Based on UAV images taken at 400 feet AGL, the visibility at NearSys Station is at least 50 miles.

Looking east. The Lucy Lee ditch, which supplies irrigation to NearSys Station, is visible as a ribbon winding its way across the image. The Boise Mountains are barely visible on the horizon on the left side.

Looking north.

Looking south towards the Snake River and the Owyhee Mountains.

Looking West towards Homedale and the Snake River.

UAVSonde Data for NearSys Station, 16 September 2017

UAVSonde data were collected at 8:00 AM MDT. Here are the data.

Altitude: 2,296 feet
Temperature: 57 *F
Relative Humidity: NA
Pressure: 938.5 mb

Altitude: 2,673 feet
Temperature: 68 *F
Relative Humidity: 25%
Pressure: 924.3 mb

Tuesday, September 12, 2017

Ground and Sky Thermal Observation for NearSys Station, 12 September 2017, part two

The high level cirrus clouds over NearSys Station this morning were replaced with a blanket of low level stratus this afternoon.

Another thermal image as recorded and found the ground temperature is 56 *F And the sky temperature overhead is 12 *F. That's a difference of 44 *F.

Assuming a dry adiobatic lapse rate of 5.3 *F indicates the cloud height is 8,100 feet AGL or 10,400 feet. Currently, the Boise Metar reports the cloud ceiling is at least 12,000 feet.

Thermal infrared image taken of the sky above NearSys Station.
RGB image taken of the sky above NearSys Station.