M. Siarkowski
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View article: Statistical Analysis of Compact Single-source Flares Observed by STIX
Statistical Analysis of Compact Single-source Flares Observed by STIX Open
X-ray emissions from solar flares provide a comprehensive overview of the spatial and spectral behaviors of high-temperature plasma in the solar atmosphere. In particular, compact flares are one of the best candidates for quantifying the g…
View article: Investigations of Flaring Plasma Parameters during an M-class Flare Using the Differential Evolution Method and XSM/Chandrayaan-2 Observations
Investigations of Flaring Plasma Parameters during an M-class Flare Using the Differential Evolution Method and XSM/Chandrayaan-2 Observations Open
We employ the differential evolution (DE) method to analyze observations from the Solar X-Ray Monitor on board the Chandrayaan-2 spacecraft. DE belongs to the family of evolutionary algorithms that find solutions using mechanisms inspired …
View article: Analysis of Solar-like X-class Flare on Wolf 359 Observed Simultaneously with TESS and XMM-Newton
Analysis of Solar-like X-class Flare on Wolf 359 Observed Simultaneously with TESS and XMM-Newton Open
We present an analysis of a flare on the Wolf 359 star based on simultaneous observations of Transiting Exoplanet Survey Satellite and XMM-Newton. A stellar flare with energy comparable to an X-class solar flare is analyzed on this star fo…
View article: Analysis of Solar-like X-Class Flare on Wolf 359 Observed Simultaneously with TESS and XMM-Newton
Analysis of Solar-like X-Class Flare on Wolf 359 Observed Simultaneously with TESS and XMM-Newton Open
We present an analysis of a flare on the Wolf 359 star based on simultaneous observations of TESS and XMM-Newton. A stellar flare with energy comparable to an X-class solar flare is analyzed on this star for the first time. The main goal o…
View article: A multi-thermal analysis of M-class flare observed in common by STIX and XSM
A multi-thermal analysis of M-class flare observed in common by STIX and XSM Open
During nearly three years of operation, STIX aboard Solar Orbiter observed thousands of flares.   Many of them were simultaneously observed by Solar X-Ray Monitor (XSM) on board Indian Chandrayaan-2 circling the Moon.  We present…
View article: Starspot Modeling and Flare Analysis on Selected Main-sequence M-type Stars
Starspot Modeling and Flare Analysis on Selected Main-sequence M-type Stars Open
We studied the light curves of GJ 1243, YZ CMi, and V374 Peg, as observed by TESS, for the presence of stellar spots and stellar flares. One of the main goals was to model the light curves of the spotted stars to estimate the number of spo…
View article: Statistical Analysis of Stellar Flares from the First Three Years of TESS Observations
Statistical Analysis of Stellar Flares from the First Three Years of TESS Observations Open
In this paper, we study stellar light curves from the Transiting Exoplanet Survey Satellite (TESS) for the presence of stellar flares. The main aim is to detect stellar flares using 2 minute cadence data and to perform a statistical analys…
View article: Statistical Analysis of Stellar Flares from the First Three Years of TESS Observations
Statistical Analysis of Stellar Flares from the First Three Years of TESS Observations Open
In this paper, we study stellar light curves from the TESS satellite (Transiting Exoplanet Survey Satellite) for the presence of stellar flares. The main aim is to detect stellar flares using two-minutes cadence data and to perform statist…
View article: Starspots Modelling and Flare Analysis on Selected MV Stars
Starspots Modelling and Flare Analysis on Selected MV Stars Open
We studied light curves of GJ 1243, YZ CMi, and V374 Peg, observed by TESS for the presence of stellar spots and stellar flares. One of the main goals was to model light curves of spotted stars to estimate the number of spots along with th…
View article: On the Application of Differential Evolution to the Analysis of X-Ray Spectra*
On the Application of Differential Evolution to the Analysis of X-Ray Spectra* Open
Using methods of differential evolution (DE), we determined the coronal elemental abundances and the differential emission measure (DEM) distributions for the plasma flaring on 2003 January 21. The analyses have been made based on RESIK X-…
View article: Statistical study of stellar flares observed with TESS
Statistical study of stellar flares observed with TESS Open
We present a statistical study of stellar flares based on TESS observations. We used the two-minute cadence data obtained from sectors 1 - 37. Our software allows us to identify flares and determine its parameters such as: amplitude, durat…
View article: KORTES Mission for Solar Activity Monitoring Onboard International Space Station
KORTES Mission for Solar Activity Monitoring Onboard International Space Station Open
We present a description of the recent advances in the development of the KORTES assembly—the first solar oriented mission designed for the Russian segment of the International Space Station. KORTES consists of several imaging and spectros…
View article: RESIK and RHESSI observations of the 20 September 2002 flare
RESIK and RHESSI observations of the 20 September 2002 flare Open
Context. Soft X-ray spectra (3.33 Å–6.15 Å) from the RESIK instrument on CORONAS-F constitute a unique database for the study of the physical conditions of solar flare plasmas, enabling the calculation of differential emission measures. Th…
View article: The Spectrometer/Telescope for Imaging X-rays (STIX)
The Spectrometer/Telescope for Imaging X-rays (STIX) Open
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 ther…
View article: The non-Fourier image reconstruction method for the STIX instrument
The non-Fourier image reconstruction method for the STIX instrument Open
In this work we aimed to develop the image reconstruction algorithm without any analytical simplifications and restrictions. In our method we abandon Fourier’s approach to image reconstruction, and instead use the number of counts recorded…
View article: Комплекс SOLPEX для исследования излучения Солнца в мягком рентгеновском диапазоне волн
Комплекс SOLPEX для исследования излучения Солнца в мягком рентгеновском диапазоне волн Open
The SOLPEX complex consists of two instruments for recording soft X-ray radiation from the Sun and is a part of the KORTES equipment, which will be installed on board the International Space Station. The first instrument is a fast-rotating…
View article: Highly Ionized Calcium and Argon X-Ray Spectra from a Large Solar Flare
Highly Ionized Calcium and Argon X-Ray Spectra from a Large Solar Flare Open
X-ray lines of helium-like calcium (Ca xix ) between 3.17 and 3.21 Å and associated Ca xviii dielectronic satellites have previously been observed in solar flare spectra, and their excitation mechanisms are well established. Dielectronic s…
View article: Flare Characteristics from X-ray Light Curves
Flare Characteristics from X-ray Light Curves Open
A new methodology is given to determine basic parameters of flares from their X-ray light curves. Algorithms are developed from the analysis of small X-ray flares occurring during the deep solar minimum of 2009, between Solar Cycles 23 and…