EAS Publications Series
Volume 55, 20124th French-Chinese Meeting on Solar Physics - Understanding Solar Activity: Advances and Challenges
|Page(s)||385 - 388|
|Published online||27 June 2012|
M. Faurobert, C. Fang and T. Corbard (eds)
EAS Publications Series, 55 (2012) 385-388
New generation Multichannel Subtractive Double Pass for imaging spectropolarimetry – The S4I prototype
GEPI, Observatoire de Paris, 5 place Jules Janssen, 92195
2 LESIA, Observatoire de Paris, CNRS, UPMC Paris 06, Université Paris Diderot, 5 place Jules Janssen, 92195 Meudon, France
Imaging spectropolarimetry is a powerful tool in solar physics. Multichannel Subtractive Double Pass (MSDP) spectrographs can produce simultaneous 2D images in a number of wavelengths covering several line profiles with the following advantages:
- Contrary to long slit spectroscopy, the spatial resolution can reach the diffraction limit.
- Contrary to narrow band filters, full line profiles are recorded at the same time without any image motion and differential seeing effect.
MSDP spectrographs use an entrance window instead of the usual long slit. A new generation MSDP using slicers made of mirrors instead of prisms is proposed for the future 4 m class European Solar Telescope. We describe the beam slicer prototype S4I (Spectral Sampling with Slicer for Solar Instrumentation) that will be tested soon at the 14 m spectrograph of the Meudon Solar Tower.
© EAS, EDP Sciences 2012