B. Sylwester
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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: Investigating weak flares energetics through nonthermal emission and solar energetic electrons: STIX and EPD observations
Investigating weak flares energetics through nonthermal emission and solar energetic electrons: STIX and EPD observations Open
Solar flares are energetic and dynamic phenomena in the solar system emitting radiation impulsively, and solar energetic electrons (SEEs). Therefore, we investigate the high-energy X-ray emission and SEEs observed by STIX and EPD onboard t…
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: Varying Calcium Abundances in Solar Flares Seen by the Solar Maximum Mission
Varying Calcium Abundances in Solar Flares Seen by the Solar Maximum Mission Open
We report on calcium abundance A (Ca) estimates during the decay phases of 194 solar X-ray flares using archived data from the Bent Crystal Spectrometer (BCS) on the Solar Maximum Mission (operational 1980–1989). The abundances are derived…
View article: Varying Calcium Abundances in Solar Flares seen by Solar Maximum Mission
Varying Calcium Abundances in Solar Flares seen by Solar Maximum Mission Open
We report on calcium abundance $A({\rm Ca})$ estimates during the decay phases of 194 solar X-ray flares using archived data from the Bent Crystal Spectrometer (BCS) on Solar Maximum Mission (operational 1980~--~1989). The abundances are d…
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: New Solar Flare Calcium Abundances with No Surprises: Results from the Solar Maximum Mission Bent Crystal Spectrometer
New Solar Flare Calcium Abundances with No Surprises: Results from the Solar Maximum Mission Bent Crystal Spectrometer Open
The calcium abundance in flare plasmas is estimated using X-ray spectra from the Solar Maximum Mission Bent Crystal Spectrometer (BCS) during the decays of 194 flares (Geostationary Operational Environmental Satellite, GOES, classification…
View article: New Solar Flare Calcium Abundances with no Surprises: Results from the SMM Bent Crystal Spectrometer
New Solar Flare Calcium Abundances with no Surprises: Results from the SMM Bent Crystal Spectrometer Open
The calcium abundance in flare plasmas is estimated using X-ray spectra from the Solar Maximum Mission Bent Crystal Spectrometer (BCS) during the decays of 194 flares (GOES classifications from B6.4 to X13) occurring between 1980 and 1989.…
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: 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: 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…
View article: THERMAL CHARACTERISTICS AND THE DIFFERENTIAL EMISSION MEASURE DISTRIBUTION DURING A B8.3 FLARE ON 2009 JULY 4
THERMAL CHARACTERISTICS AND THE DIFFERENTIAL EMISSION MEASURE DISTRIBUTION DURING A B8.3 FLARE ON 2009 JULY 4 Open
We investigate the evolution of the differential emission measure distribution (DEM[ T ]) in various phases of a B8.3 flare which occurred on 2009 July 04. We analyze the soft X-ray (SXR) emission in the 1.6–8.0 keV range, recorded collect…
View article: High-temperature solar flare plasma behaviour from crystal spectrometer observations
High-temperature solar flare plasma behaviour from crystal spectrometer observations Open
We present results of analysis of the spectra collected with Polish instrument RESIK flown on CORONAS-F satellite. RESIK was the bent crystal spectrometer, measuring spectra in the spectral range 3.3 - 6.1 Å with a high cadence during flar…
View article: Solar X-rays from 0.3 <scp>a.u.</scp>: the ChemiX Bragg Spectrometer on Interhelioprobe
Solar X-rays from 0.3 <span>a.u.</span>: the ChemiX Bragg Spectrometer on Interhelioprobe Open
ChemiX is a Bragg crystal spectrometer that will fly on the two Interhelioprobe spacecraft due for launch in 2025 and 2026. The spacecraft perihelion will be only 0.3 a.u. and the orbit inclination up to 30°, and so instruments on board wi…
View article: Solar flare soft X-ray spectra from Diogeness observations
Solar flare soft X-ray spectra from Diogeness observations Open
Diogeness was an uncollimated scanning flat crystal spectrometer observing solar flare X-ray spectra in four narrow wavelength bands in the vicinity of Ca xix , S xv and Si xiii He-like line ‘triplets’ around 3.18 Å, 5.04 Å and 6.65 Å. In …
View article: Thermal characteristics of a B8.3 flare observed on July 04, 2009
Thermal characteristics of a B8.3 flare observed on July 04, 2009 Open
We explore the temporal evolution of flare plasma parameters including temperature ( T ) - differential emission measure ( DEM ) relationship by analyzing high spectral and temporal cadence of X-ray emission in 1.6-8.0 keV energy band, rec…
View article: IAU volume 11 issue S320 Cover and Front matter
IAU volume 11 issue S320 Cover and Front matter Open
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View article: Multitemperature analysis of solar flare observed on 2003 March 29
Multitemperature analysis of solar flare observed on 2003 March 29 Open
We present results of multitemperature analysis of GOES C7.2 class flare SOL2003-03-29T10:15. This event occurred close to the centre of the solar disk and had two maxima in soft X-rays. We have performed analysis of physical parameters ch…