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| Paper: |
Maintaining Software for Active Missions: A Case Study of Chandra”s Instrumentation Over Time |
| Volume: |
442, Astronomical Data Analysis Software and Systems XX (ADASSXX) |
| Page: |
379 |
| Authors: |
Gibbs II, D. G.; Chen, J. C.; Glotfelty, K. J.; Allen, G. E.; Huenemoerder, D. P.; Primini, F. A. |
| Abstract: |
During eleven plus years of operation, ample knowledge has been gained regarding
the Chandra X-ray Observatory's scientific instruments and how they are
performing over time. In this paper we will summarize the significant software
changes related to the performance and knowledge gained about the observatory's
instrumentation specifically targeting the last five years of the mission. With
this knowledge, numerous upgrades to the Chandra processing software have taken
place to correct issues that have developed on orbit
(ACIS CTI effects, LETG/ACIS rotation), to correct for hardware
issues (HRC timing), and for our
better understanding of the evolution of the instrumentation (temporal gain
shifts in both instruments).
In addition, we will discuss the challenges in maintaining software when the
calibrations for different operating modes are incrementally made available.
This includes challenges in maintaining an archive with a mixture of data
products with different calibrations applied. This paper roughly covers the era
of the 3rd reprocessing of the Chandra archive (Repro-3). |
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