The Spectrometer/Telescope for Imaging X-rays (STIX)

Säm Krucker, G. J. Hurford, O. Grimm, S. Kögl, H.-P. Gröbelbauer, L. Etesi, Diego Casadei, A. Csillaghy, A. O. Benz, N. G. Arnold, F. Molendini, P. Orleanski, D. Schori, Hong Xiao, M. Kuhar, S. Kobler, L. Iseli, M. Dreier, H. J. Wiehl, L. KleintShaun Bloomfield

Research output: Contribution to journalArticlepeer-review

95 Citations (Scopus)
25 Downloads (Pure)


Aims. The Spectrometer Telescope for Imaging X-rays (STIX) on Solar Orbiter is a hard X-ray imaging spectrometer, which covers the energy range from 4 to 150 keV. STIX observes hard X-ray bremsstrahlung emissions from solar flares and therefore provides diagnostics of the hottest (⪆10 MK) flare plasma while quantifying the location, spectrum, and energy content of flare-accelerated nonthermal electrons.

Methods. To accomplish this, STIX applies an indirect bigrid Fourier imaging technique using a set of tungsten grids (at pitches from 0.038 to 1 mm) in front of 32 coarsely pixelated CdTe detectors to provide information on angular scales from 7 to 180 arcsec with 1 keV energy resolution (at 6 keV). The imaging concept of STIX has intrinsically low telemetry and it is therefore well-suited to the limited resources available to the Solar Orbiter payload. To further reduce the downlinked data volume, STIX data are binned on board into 32 selectable energy bins and dynamically-adjusted time bins with a typical duration of 1 s during flares.

Results. Through hard X-ray diagnostics, STIX provides critical information for understanding the acceleration of electrons at the Sun and their transport into interplanetary space and for determining the magnetic connection of Solar Orbiter back to the Sun. In this way, STIX serves to link Solar Orbiter’s remote and in-situ measurements.
Original languageEnglish
Article numberA15
Number of pages21
JournalAstronomy & Astrophysics
Early online date30 Sept 2020
Publication statusPublished - 1 Oct 2020


Dive into the research topics of 'The Spectrometer/Telescope for Imaging X-rays (STIX)'. Together they form a unique fingerprint.

Cite this