SCIAMACHY cL0 Data Availability
Usually SCIAMACHY generated data continuously over the orbit with only short, pre-planned gaps. In the illuminated part of the orbit limb and nadir together with occasional limb_mesosphere_thermosphere measurements were executed while the eclipse observations mainly served calibration & monitoring purposes. A specific case were the limb_mesosphere measurements in eclipse which have turned out to be of high scientific interest for mesospheric studies.
As long as no interrupts occurred - planned or triggered by an in-orbit anomaly - the downlinked data should reflect planned measurements. Due to acquisition or processing anomalies, the ground segment may had added to phases with data unavailability. Such additional data gaps could either had affected data being generated in near-realtime or offline. In the latter case they were commonly referred to as consolidated products. Since a consolidated product spanned one complete orbit from ANX to ANX, it was the best representation of the measurement schedule. Based on the lowest level of measurement data, i.e. level 0, a record of consolidated data availability was maintained for the entire SCIAMACHY in-orbit mission lifetime starting when the instrument began operating in quasi routine measurement mode (2 August 2002, orbit 2004).
This cL0 record was the result of our verification of the consolidated products delivered by LRAC via D-PAC. It generated a master archive of cL0 data which served SOST's long-term monitoring responsibilities and was used as a repository for future level 1b and level 2 reprocessing campaigns. A calender illustrating the availability of cL0 products per orbit is now maintained by ESA. It can be accessed via SCIAMACHY consolidated Level 0 products.