The Spectrometer Telescope for Imaging X-Rays (STIX) on Solar Orbiter

Hayes, Laura A.; Musset, Sophie; Müller, D.; Krucker, S.

doi:10.1007/978-981-16-4544-0_168-1

Cited by 2 publications

(1 citation statement)

References 18 publications

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“…STIX on board the Solar Orbiter observes the Sun uninterruptedly in X-ray wavelength in a 4-150 keV energy range with a time cadence as high as 0.1 s. The incoming X-ray emission, when passed through 30 pairs of X-ray opaque Tungsten grids of varying pitch placed at different orientations before 30 pixelated (eight large pixels and four small pixels) detectors, forms a moiré pattern that can be further analyzed to identify the location, shape, and brightness of the source (Giordano et al 2015;Hayes et al 2022;Massa et al 2022). STIX observations are provided in two formats: pixel data (containing observations from all the individual detectors and pixels) and spectrograms (pixel-integrated observations).…”

Section: Observations and Instrumentsmentioning

confidence: 99%

Relative Yield of Thermal and Nonthermal Emission during Weak Flares Observed by STIX during 2021 September 20–25

Awasthi,

Mrozek,

Kołomański

et al. 2024

ApJ

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The disparate nature of the thermal–nonthermal energy partition during flares, particularly during weak flares, is still an open issue. Following the Neupert effect, quantifying the relative yield of X-ray emission in different energy bands can enable the inferring of the underlying energy release mechanism. During 2021 September 20–25, the Solar Orbiter mission—being closer to the Sun (∼0.6 au) and having a moderate separation angle (<40°) from the Sun–Earth line—offered a unique opportunity to analyze multiwavelength emission from ∼200 (mostly weak) flares, commonly observed by the Spectrometer Telescope for Imaging X-rays (STIX), STEREO-A, GOES, and the Solar Dynamics Observatory. Associating the quotient (q f ) of hard X-ray fluence (12–20 keV) and soft X-ray flux (4–10 keV) with the peak soft X-ray flux enabled us to identify strongly nonthermal flares. A multiwavelength investigation of spectral and imaging-mode observations of the 20 strongly nonthermal weak flares reveals an inverse relationship of q f with the emission measure (and density), and a positive relationship with the flare plasma temperature. This indicates that the plasma in tenuous loops attains higher temperatures compared to that in the denser loops, in response to nonthermal energy deposition. This is in agreement with the plasma parameters of the coronal loops, as derived by applying the one-dimensional Palermo–Harvard hydrodynamical code to coronal loop plasma with different initial coronal loop base pressures when subjected to similar heating inputs. Our investigation, therefore, indicates that the plasma parameters of the flaring loop in the initial phase have a decisive role in the thermal–nonthermal energy partitioning.

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Section: Observations and Instrumentsmentioning

confidence: 99%

Relative Yield of Thermal and Nonthermal Emission during Weak Flares Observed by STIX during 2021 September 20–25

Awasthi,

Mrozek,

Kołomański

et al. 2024

ApJ

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Development of the cadmium zinc TElluride Radiation Imager

Shy,

Streicher,

Groves

et al. 2024

J. Astron. Telesc. Instrum. Syst.

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The cadmium zinc TElluride Radiation Imager, or TERI, is an instrument to spacequalify large-volume 4 × 4 × 1.5 cm 3 pixelated CdZnTe (CZT) detector technology. The CZT's anode is composed of a 22 × 22 array of pixels, whereas the cathode is planar. TERI contains four of those crystals with each pixel having an energy range of 40 keV up to 3 MeV with a resolution of 1.3% full-width-at-half maximum at 662 keV all while operating in room temperature. As the detectors are 3D position sensitive, TERI can Compton image events. TERI is fitted with a coded-aperture mask, which permits imaging of low-energy photons in the photoelectric regime. TERI's primary mission is to space-qualify large-volume CZT and measure its degradation due to radiation damage in a space environment. Its secondary mission includes detecting and localizing astrophysical gamma-ray transients. TERI is manifested in the Department of Defense's STP-H10 mission for launch to the International Space Station in early 2025.

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The Spectrometer Telescope for Imaging X-Rays (STIX) on Solar Orbiter

Cited by 2 publications

References 18 publications

Relative Yield of Thermal and Nonthermal Emission during Weak Flares Observed by STIX during 2021 September 20–25

Relative Yield of Thermal and Nonthermal Emission during Weak Flares Observed by STIX during 2021 September 20–25

Development of the cadmium zinc TElluride Radiation Imager

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