----------------------------------------------------------------------------- Mauna Loa Solar Observatory Observer's Log ----------------------------------------------------------------------------- Mon Mar 24 16:48:53 GMT 2003 Year: 03 Doy: 083 Observer: stueben Mon Mar 24 16:56:19 GMT 2003 CHIP Start Patrol Mon Mar 24 16:56:36 GMT 2003 PICS Start Patrol WEATHER COMMENT: Mon Mar 24 16:56:32 GMT 2003 Clear, south wind 5-10mph, temp 45F. A NEW TAPE HAS BEEN PUT INTO KAIEE DLT DRIVE, Mon Mar 24 17:11:33 GMT 2003 Mon Mar 24 17:16:52 GMT 2003 MKIV Start Patrol MKIV COMMENT: Mon Mar 24 17:17:17 GMT 2003 Centered 01 guider. WEATHER COMMENT: Mon Mar 24 17:57:02 GMT 2003 Some scattered patches of cirrus have come up. Mon Mar 24 18:02:03 GMT 2003 PICS Flat Mon Mar 24 18:02:53 GMT 2003 CHIP LSD Mon Mar 24 18:04:37 GMT 2003 PICS End Flat Mon Mar 24 18:04:48 GMT 2003 CHIP End LSD Mon Mar 24 18:05:04 GMT 2003 CHIP BiasLSD Mon Mar 24 18:06:04 GMT 2003 CHIP End BiasLSD Mon Mar 24 18:06:18 GMT 2003 CHIP Bias Mon Mar 24 18:07:14 GMT 2003 CHIP End Bias MKIV COMMENT: Mon Mar 24 18:45:09 GMT 2003 Centered 01 guider. **MKIV PROBLEM**: Mon Mar 24 19:01:06 GMT 2003 Tested barrel drag theory while in cirrus overcast. Introduced drag to barrel by using my hands to create friction against barrel rotation. I did not see any effect on stepper until I practically grabbed hold of the trough edges and pulled against the rotation. This caused the barrel to stop, the stepper reversed itself a couple of rotations and then reverted back to its nominal direction as I released the barrel. This was a lot of introduced drag. Downstairs on akamai's window, there were "t_drive barrel glitch" messages, approximately one per test (or it could be four entries during one of the tests, I'm unsure how they were written to the display window). That exercise also caused the barrel to crash at the 175-degree turnaround. KCC gui indicated a barrel CCW rate of 30. When I selected Stop and then selected a CW rate of 120, the barrel started rotation in the CW direction to the CW limit. Selected CCW rate of 120 and barrel rotated off CW limit and began rotating to the 175-degree turnaround point. At that point, mk4 began scanning normally, displaying coronal data. MKIV COMMENT: Mon Mar 24 19:36:21 GMT 2003 Centered 01 guider. Mon Mar 24 19:49:11 GMT 2003 MKIV End Patrol Mon Mar 24 19:49:52 GMT 2003 CHIP End Patrol COMMENT: Mon Mar 24 19:49:20 GMT 2003 Stopped to reconfigure dome shutter. Also resetting KCC to attempt to change Xanim display which is displaying what looks like overexposed coronal images. Mon Mar 24 19:54:00 GMT 2003 PICS End Patrol Mon Mar 24 19:56:33 GMT 2003 MKIV Start Cal Mon Mar 24 19:56:50 GMT 2003 CHIP Start Patrol Mon Mar 24 19:57:02 GMT 2003 PICS Start Patrol Mon Mar 24 20:16:10 GMT 2003 MKIV Start Patrol MKIV COMMENT: Mon Mar 24 20:39:44 GMT 2003 Centered 01 guider. COMMENT: Mon Mar 24 20:47:06 GMT 2003 Dec axis reset. Repointed spar, reset guider. **MKIV PROBLEM**: Mon Mar 24 21:09:19 GMT 2003 We did some stall tests in clouds and threw the guiding off temporarily while doing gorilla moves to the barrel. This time we applied some friction to the stepper motor directly at the "flywheel" device attached to the motor. The motor just chattered as we stalled it. Motor did not reverse direction like we were observing during the problem. We repeated trying to stall the motor with friction and tension to the barrel and again came to the conslusion that it took a whole lot of force to stall the barrel. The motor reversed itself for several turns, but that could have been from springing back due to the reverse force we had to apply to stop the barrel. This time there were no t_drive barrel glitch messages on the akamai window and we did not crash the scanning like last time. The barrel stalls could be from the wrap-up but I don't see how the wrap-up could get that tight and then loosen up by a few degrees of direction reversal when the stalls are occurring intermittently and often during a single scan. **CHIP PROBLEM**: Mon Mar 24 21:51:24 GMT 2003 CHIP image was offset due to its executing a centering while the spar was off-pointing during our barrel tests. Corrected centering by jogging the micrometer controller to default position in the Y direction. MKIV COMMENT: Mon Mar 24 21:59:06 GMT 2003 Centered 01 guider. MKIV COMMENT: Mon Mar 24 22:58:34 GMT 2003 Centered 01 guider. WEATHER COMMENT: Mon Mar 24 23:36:30 GMT 2003 Cirrus getting thicker and a some orographic clouds coming up as well. MKIV COMMENT: Mon Mar 24 23:39:35 GMT 2003 Letting the mk4 run just to watch the barrel rotation for intermittent stalls and stutters. Data no good at this time. **PSPT PROBLEM**: Tue Mar 25 00:47:49 GMT 2003 PSPT crashed making jpeg images at 01:10UT (same crash, same time as on Saturday ). Killed and restarted. COMMENT: Tue Mar 25 01:25:03 GMT 2003 Reconfigured dome shutter. Tue Mar 25 01:25:18 GMT 2003 CHIP End Patrol **CHIP PROBLEM**: Tue Mar 25 01:25:35 GMT 2003 CHIP recentered while spar was not pointed well. Recentering image. Tue Mar 25 01:27:18 GMT 2003 CHIP Start Patrol **MKIV PROBLEM**: Tue Mar 25 01:32:17 GMT 2003 David suggested that the FLC flakiness I observed on DOY 03080 and the barrel stalls/stuttering are related via the modulator timing signals (1/rot and 64/rot). Checked the cabling between modulator and signal transformation board and they looked OK. Cable connector near spar test points are dreadfully near the mk4 wrap-up cover that we were removing and replacing. Barrel is not acting up today but we put a oscilloscope on the modulator testpoints in the rear of the mk4 transformation/KCC rack to monitor the voltage and timing of the signals. Other things to look for are flaky power supply to the transformation board and flaky components that are not operating at proper voltages. **MKIV PROBLEM**: Tue Mar 25 01:46:00 GMT 2003 Andrew requested a mk4 O1 cleaning at our earliest convenience. They are seeing a fixed spiral structure in the pB data in the SW and increased brightness in the coronal signals. Tue Mar 25 02:27:44 GMT 2003 CHIP End Patrol Tue Mar 25 02:28:07 GMT 2003 MKIV End Patrol Tue Mar 25 02:28:22 GMT 2003 PICS End Patrol WEATHER COMMENT: Tue Mar 25 02:30:25 GMT 2003 Clouds receded at the very end of the observing day. 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