Solar Disk Integration (SDI) telescope
Retired in summer 2022.
The old SDI was retired in summer 2022. It has been replaced with the SDI-POL, which has also polarimetric capabilities.
Disk-unresolved solar light is fed to the spectrograph from a small Sun-as-a-star telescope via a fibre connection to the calibration unit. An integration sphere behind the telescope feeds two fibres to the spectrograph (note that the telescope was redesigned compared to the original description in the PEPSI technical paper in AN). SDI's aim is, firstly, to provide an external comparison source for the instrumental profile and monitor its long-term stability and, secondly, to monitor the Sun over an entire magnetic activity cycle, among others.
Data rate 402GB/day , 32TB SAN storage for 60 d.
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The poster presents the optical spectrum of the Sun obtained with SDI can be downloaded from the news section.
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Partial Solar eclipse in 2017 was observed by SDI. Read more...
SDI telescope.
Telescope embedded in ice.
SDI optical degign.
Example solar spectrum showing Ca II H&K lines obtained with SDI.
Chamber RV stability reached: Solar p-mode oscillations detected.
Caption: SDI's view of the Mercury transit from May 2016