Count-based imaging model for the Spectrometer/Telescope for Imaging X-rays (STIX) in Solar Orbiter

被引：18
|
作者：
Massa, Paolo [1 ]
Piana, Michele [1 ,2 ]
Massone, Anna Maria [1 ,2 ]
Benvenuto, Federico [1 ]
机构：
[1] Univ Genoa, Dipartimento Matemat, Via Dodecaneso 35, I-16146 Genoa, Italy
[2] CNR SPIN Genova, Via Dodecaneso 33, I-16146 Genoa, Italy
来源：
ASTRONOMY & ASTROPHYSICS | 2019年 / 624卷
关键词：
techniques: image processing; instrumentation: detectors; methods: data analysis; Sun:; X-rays; gamma rays; Sun: flares; ELECTRON-SPECTRA; FLARES;
D O I：
10.1051/0004-6361/201935323
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The Spectrometer/Telescope for Imaging X-rays (STIX) will study solar flares across the hard X-ray window provided by the Solar Orbiter cluster. Similarly to the Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI), STIX is a visibility-based imaging instrument that will require Fourier-based image reconstruction methods. However, in this paper we show that as for RHESSI, count-based imaging is also possible for STIX. Specifically, we introduce and illustrate a mathematical model that mimics the STIX data formation process as a projection from the incoming photon flux into a vector consisting of 120 count components. Then we test the reliability of expectation maximization for image reconstruction in the case of several simulated configurations that are typical of flare morphology.
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页数：8
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