STIS Science Morning SMOV Report: 24 July 2009
Outlines
• Tiger Team Recommendations
• Current Instrument Status
• Forward Plan
STIS SMOV Morning Report July 24, 2009
Tiger Team Recommendations and Forward Plan
Analysis:
• Original failure to get time update from MIE (MAMA Interface Electronics) appears
not to have recurred since MIE was reset.
• Consistent with SEU (Single Event Upset)
• Subsequent suspends following the use of the OMIE2RAM macro appear to be
similar to 1997 suspend event HSTAR 6235 where the STIS microprocessor
appears to have stopped allowing higher priority tasks to interrupt the ongoing task
• HSTAR 6235 also followed use of OMIE2RAM
• Underlying cause of these suspends is not yet understood
Recommendations:
• The Tiger Team recommends the resumption of STIS MAMA Operations via SMS
» No special actions required (protections are adequate)
• Proceed with the planned acquisition of FUV darks and internals on the next SMS
» Insert at least a day or so between the initial FUV exposures and the resumption of the
NUV SMOV Ramp up
•
Allows intervention time if needed (highly unlikely)
• Proceed with STIS SMOV Timeline for NUV (complete HV ramp-up visits 3 and 4)
• Continue with SMOV Activities
• Do not purposely command OMIE2RAM
Forward Plan for Tiger Team:
• Will continue investigation into underlying cause as resources permit.
July 23, 2009
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STIS SMOV Morning Report July 24, 2009
Current Instrument Status and forward plan
STIS is currently in operate mode
Plan for near-term STIS Observations
 CCD internal exposures are being taken this week
CCD SMOV Daily Dark and Bias monitor 11404 resumed yesterday
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CCD Anneal (11849) underway today along with pre- and post-anneal observations
10 visits of Cycle 17 calibration program 11850 will take about 200 bias images
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Plan to resume MAMA observations next week (internals only)
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Complete MAMA NUV HV recovery (visits 3A and 4A of 11351)
FUV and NUV internal lamp spectra (11391 & 11392)
FUV and NUV darks (11390 & 11402)
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Images examined and appear normal
Will resume external STIS observations (CCD and MAMA) on 215 SMS.
July 23, 2009
P. 3