TWP/TSI/C1 - solar shadowband inoperative

The mirror/shadowband was not turning and there was no communication with the control 
board. The shadowband was stuck in the position of 0 degrees from 8/29 to 9/20/2006.

On 10/12/2006, the mirror was replaced, the real-time clock chip was removed and heat 
sinks were added to the control board, and the Ethernet hub and serial adaptor were replaced. 
On 1/8/2007, the slip clutch assembly, timing pulley, and timing belt were replaced 
(which were damaged when the mirror was replaced). These actions did not correct the problem. 
The instrument was swapped with the unit from Darwin so that the control board could be 
repaired and tested in Darwin.

Several images were collected in the iterim that should be ignored. These images include 
periods when the sun was not masked by the shadowband or the camera lens was covered by 
tape to protect the CCD from direct
exposure to the sun. There are also extended periods of missing data when the instrument 
was shutdown, waiting for parts.

The data for only one sample per day, acquired at solar noon when the sun was at the 

same position as the shadowband, can be used.

• percent.opaque
• region.zenith.count
• time
• alt
• solar.azimuth
• time_offset
• sun.strength
• count.sky
• count.mask
• count.opaque
• count.thin
• region.zenith.count.opaque
• region.horizon.count.thin
• region.sun.count.opaque
• count.unknown
• count.sub.proczen
• region.sun.count.thin
• region.zenith.count.thin
• lon
• solar.altitude
• sunny
• percent.thin
• region.sun.count
• region.horizon.count
• lat
• region.horizon.count.opaque
• base_time
• count.sub.horz
• count.box

• JPEG data stream - documentation not yet available

• png

• MPEG data stream - documentation not yet available