Editing Swedish Solar Telescope (section)

==Instruments==

===CHROMIS===

The ''CHROMospheric Imaging Spectrometer''<ref>{{cite web|title=CHROMIS|url=https://dubshen.astro.su.se/wiki/index.php/CHROMIS|work=SST wiki|publisher=Institute for Solar Physics|accessdate=26 September 2017}}</ref> (CHROMIS) was installed in 2016. It is similar to [[#CRISP|CRISP]] (but so far without polarimetry) and designed for use at wavelengths in the range 380–500&nbsp;nm. In particular, CHROMIS is optimized for use in the Ca&nbsp;II H and K lines, which are formed in the upper chromosphere. The total system uses three 1920×1200-pixel Grasshopper 3 CMOS cameras from Point Grey (now FLIR). One camera is used for direct narrow-band observations and two, in a phase-diversity configuration, are collecting simultaneous wide-band image data.

===CRISP===

The ''CRisp Imaging SpectroPolarimeter''<ref>{{cite web|title=SST CRISP images|url=http://www.isf.astro.su.se/crisp.html|work=SST website|publisher=Institute for Solar Physics|accessdate=28 May 2011}}</ref><ref>{{cite journal
|last=Scharmer|first=G. B.
|author2=Narayan, G.
|author3=Hillberg, T.
|author4=de la Cruz Rodriguez, J.
|author5=Löfdahl, M. G.
|author6=Kiselman, D.
|author7=Sütterlin, P.
|author8=van Noort, M.
|author9=Lagg, A.
|title=CRISP Spectropolarimetric Imaging of Penumbral Fine Structure|journal=The Astrophysical Journal|date=December 2008|volume=689|issue=1|pages=L69–L72|doi=10.1086/595744|arxiv=0806.1638|bibcode=2008ApJ...689L..69S}}</ref><ref>{{cite web|title=CRISP|url=https://dubshen.astro.su.se/wiki/index.php/CRISP|work=SST wiki|publisher=Institute for Solar Physics|accessdate=26 September 2017}}</ref> (CRISP) was installed in 2008. It operates from 510 to 860&nbsp;nm and is able to measure polarization by using liquid crystal modulation combined with a polarizing beam splitter. The total system uses three 1k × 1k Sarnoff CCDs, two are used for direct narrow-band observations and the third is collecting simultaneous wide-band images.

===TRIPPEL===

The ''TRI-Port Polarimetric Echelle-Littrow''<ref>{{cite web|title=TRIPPEL spectrograph|url=http://dubshen.astro.su.se/wiki/index.php/Spectrograph|work=SST Wiki|publisher=Institute for Solar Physics|accessdate=28 May 2011}}</ref>  (TRIPPEL) is a [[Littrow spectrograph]] using a 79 grooves/mm [[echelle grating]] with a blaze angle of 63.43 degrees. TRIPPEL's wavelength range is about 380–1100&nbsp;nm, and it has a moderate resolution for a solar telescope, with R being approximately 200,000. This corresponds to about 1.3&nbsp;km/s on the solar surface.

TRIPPEL has a number of key useful features. It allows simultaneous observations at 3 different wavelengths, can in principle exploit the full spatial resolution of the SST, and has good polarimetric properties.