A5060007320- Solar and Space Plasma Dynamics
- Ionosphere and magnetosphere dynamics
- Astro and Planetary Science
- Solar Radiation and Photovoltaics
- Atmospheric Ozone and Climate
- Stellar, planetary, and galactic studies
- Photovoltaic System Optimization Techniques
- Geomagnetism and Paleomagnetism Studies
- Gamma-ray bursts and supernovae
- Radiation Therapy and Dosimetry
- Electron and X-Ray Spectroscopy Techniques
- Earthquake Detection and Analysis
- Distributed and Parallel Computing Systems
- Calibration and Measurement Techniques
- Plasma Diagnostics and Applications
- Geological and Geophysical Studies
University of Graz
2017-2024
FHNW University of Applied Sciences and Arts
2021-2023
HES-SO University of Applied Sciences and Arts Western Switzerland
2021
Czech Academy of Sciences, Institute of Physics
2021
University of Glasgow
2008-2012
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 bremsstrahlung emissions solar flares and therefore provides diagnostics of hottest (⪆10 MK) flare plasma while quantifying location, spectrum, content flare-accelerated nonthermal electrons. Methods. To accomplish this, applies an indirect bigrid Fourier technique using set tungsten grids (at pitches 0.038 1 mm) in...
The Spectrometer/Telescope for Imaging X-rays (STIX) is one of six remote sensing instruments on-board Solar Orbiter. telescope applies an indirect imaging technique that uses the measurement 30 visibilities, i.e., angular Fourier components solar flare X-ray source. Hence, problem STIX consists inversion data measured by instrument. In this work, we show visibility amplitude and phase calibration 24 out sub-collimators has reached a satisfactory level scientific exploitation set methods...
The Spectrometer and Telescope for Imaging X-rays (STIX) on board Solar Orbiter observes solar X-ray emission in the range of 4 – 150 keV produces spectra images flares over a wide flare magnitudes. During nominal operation, STIX continuously generates data. A constant data flow requires fully automated data-processing pipelines to process analyze data, platform manage, visualize, distribute products scientific community. Data Center has been built fulfill these needs. In this paper,...
The Spectrometer/Telescope for Imaging X-Rays (STIX) on board Solar Orbiter was designed to observe solar flares in the X-ray range of 4-150 keV, providing spectral, temporal, and spatial information. Besides 30 imaging detectors, STIX has two additional detectors: coarse flare locator (CFL) background (BKG) detector, which are used present study. Flares observed from Earth classified using their peak flux by Geostationary Operational Environmental Satellite (GOES) instruments. Given mission...
Context. The Spectrometer/Telescope for Imaging X-rays (STIX) is the hard X-ray instrument onboard Solar Orbiter designed to observe solar flares over a broad range of flare sizes. Aims. We report first STIX observations microflares recorded during commissioning phase in order investigate performance at its detection limit. Methods. uses imaging spectroscopy between 4–150 keV diagnose hottest plasma and related nonthermal electrons. This result paper focuses on temporal spectral evolution...
Context. Coronal dimmings are localized regions of reduced emission in the extreme-ultraviolet (EUV) and soft X-rays formed as a result expansion mass loss by coronal ejections (CMEs) low corona. Distinct relations have been established between (intensity, area, magnetic flux) key characteristics associated CMEs (mass speed) combining coronagraphic observations from different viewpoints heliosphere. Aims. We investigate relation spatiotemporal evolution dimming region both dominant direction...
It is well known among the scientific community that solar flare activity often begins before main impulsive energy release. Our aim to investigate earliest phase of four distinct flares observed by Solar Orbiter/STIX and determine relationships newly heated plasma structure dynamics. The analysis focuses on events were from both Earth Orbiter, which allows for a comparison STIX observations with those GOES/XRS SDO/AIA. early phases studied using GOES spectroscopic evolution physical...
Abstract We analyze a confined multiple-ribbon M2.1 flare (SOL2015-01-29T11:42) that originated from fan-spine coronal magnetic field configuration, within active region NOAA 12268. The observed ribbons form in two steps. First, primary at the main site, followed by formation of secondary remote locations. observe number plasma flows extreme-ultraviolet temperatures during early phase (as as 15 minutes before onset) propagating toward site ribbons. ribbon is co-temporal with arrival...
Context. The spectral shape of the X-ray emission in solar flares varies with event size, small generally exhibiting softer spectra than large events, indicative a relatively lower number accelerated electrons at higher energies. Aims. We investigate two microflares GOES classes A9 and C1 (after background subtraction) observed by STIX onboard Solar Orbiter exceptionally strong nonthermal emission. complement hard imaging analysis co-temporal observations (E)UV visual range AIA HMI to what...
Context. The Spectrometer Telescope for Imaging X-rays (STIX) on board Solar Orbiter enables exciting multipoint studies of energy release and transport in solar flares by observing the Sun from many different distances vantage points out Sun-Earth line. Aims. We present a case study an M4-class flare that occurred 28 March 2022, near Orbiter’s first science perihelion (0.33 AU Sun). had longitudinal separation 83.5° west line, making event appear eastern limb its perspective, while...
During its commissioning phase in 2020, the Spectrometer/Telescope for Imaging X-rays (STIX) on board Solar Orbiter spacecraft observed 69 microflares. The two most significant events from this set (of GOES class B2 and B6) were on-disk as well Earth analysed terms of spatial, temporal, spectral characteristics. We complement observations STIX instrument with EUV imagery SDO/AIA soft X-ray data by adding imaging plasma diagnostics over different temperature ranges a detailed microflare case...
One of the main science questions Solar Orbiter and Parker Probe missions deals with understanding how electrons in lower solar corona are accelerated they subsequently access interplanetary space. We aim to investigate electron acceleration energy release sites as well manner which space case SOL2021-02-18T18:05 event, a GOES A8 class microflare associated coronal jet. This study takes advantage three different vantage points, Orbiter, STEREO-A, Earth, observations ranging from radio X-ray....
Abstract We report observations of an eruptive X2.8 flare on 2013 May 13, which shows two distinct episodes energy release in the impulsive phase. The first episode is characterized by eruption a magnetic flux rope, similar to energy-release process most standard flares. second episode, stronger than normal one and enhanced high-energy X-ray even γ -ray emissions, closely associated with reconnection large-scale loop aftermath eruption. inflow leg observed Solar Dynamics Observatory ( SDO...
We combine observations from different vantage points to perform a detailed study of long duration eruptive C7 class flare that occurred on 17 April 2021 and was partially occulted Earth view. The dynamics thermal properties the flare-related plasma flows, flaring arcade, energy releases particle acceleration are studied together with kinematic evolution associated CME in order place this event context previous studies. showed hard X-ray (HXR) bursts over an hour two phases lasting 16:04 UT...
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Models of particle acceleration in solar eruptive events suggest that roughly equal energy may go into accelerating electrons and ions. However, while previous X-ray spectroscopic imagers have transformed our understanding electron acceleration, only one resolved image γ-ray emission from accelerated ions has ever been produced. This paper outlines a new satellite instrument concept—the large imaging spectrometer for nuclei (LISSAN)—with the capability not to observe hundreds over its...
We analyze the complete chain of effects caused by a solar eruptive event in order to better understand dynamic evolution magnetic-field related quantities interplanetary space, particular that magnetic flux and helicity. study series connected events (a confined C4.5 flare, flare-less filament eruption double-peak M-class flare) originated NOAA active region (AR) 12891 on 2021 November 1 2. deduce structure AR using stereoscopy nonlinear force-free (NLFF) field modeling, allowing us...
We studied the rapid filament evolution in AR 12975 during a confined C2 flare on 28 March 2022, which led to an eruptive M4 1.5 h later. It is characterized by breakup of filament, disappearance its southern half, and flow remaining plasma into longer channel with topology similar EUV hot flare. Our multipoint study takes advantage Solar Orbiter's position at 0.33 AU 83. 5{\deg} west Sun-Earth line. STIX EUI onboard Orbiter observed event limb. AIA HMI SDO provided on-disk observations from...
Abstract HXI on ASO-S and STIX onboard Solar Orbiter are the first simultaneously operating solar hard X-ray imaging spectrometers. ASO-S’s low Earth orbit Orbiter’s periodic displacement from Sun–Earth line enables multi-viewpoint spectroscopic analysis for time. Here, we demonstrate potential of this new capability by reporting results 3D triangulation sources in SOL2023-12-31T21:55 X5 flare. observed flare near east limb with an observer separation angle 18°. We triangulated brightest...
The Spectrometer/Telescope for Imaging X-rays (STIX) on-board the ESA Solar Orbiter mission retrieves coordinates of solar flare locations by means a specific sub-collimator, named Coarse Flare Locator (CFL). When occurs on Sun, emitted X-ray radiation casts shadow peculiar "H-shaped" tungsten grid over CFL detector. From measurements areas detector that are illuminated radiation, it is possible to retrieve $(x,y)$ location disk. In this paper, we train neural network dataset real...
Abstract We analyze a confined flare that developed hot cusp-like structure high in the corona ( H ∼ 66 Mm). A growing cusp-shaped arcade is typical feature standard model of eruptive flares, caused by magnetic reconnection at progressively larger coronal heights. In contrast, we observe static cusp during flare. Despite an initial vertical temperature distribution similar to distinctly different evolution late (decay) phase, form prolonged emission. The distinct shape, rooted locations...