A5082188185- Solar and Space Plasma Dynamics
- Ionosphere and magnetosphere dynamics
- Astro and Planetary Science
- Stellar, planetary, and galactic studies
- Geophysics and Gravity Measurements
- Geomagnetism and Paleomagnetism Studies
- Atmospheric Ozone and Climate
- Solar Radiation and Photovoltaics
- Gamma-ray bursts and supernovae
- Calibration and Measurement Techniques
- Astronomy and Astrophysical Research
- X-ray Spectroscopy and Fluorescence Analysis
- Medical Imaging Techniques and Applications
- Astronomical Observations and Instrumentation
- Earthquake Detection and Analysis
- Advanced X-ray Imaging Techniques
- Astrophysics and Cosmic Phenomena
- Magnetic confinement fusion research
- Nuclear Physics and Applications
- Astrophysics and Star Formation Studies
- Spacecraft and Cryogenic Technologies
- Atomic and Molecular Physics
- Astrophysical Phenomena and Observations
- Radio Astronomy Observations and Technology
- Oil, Gas, and Environmental Issues
Centrum Badań Kosmicznych
2014-2023
Polish Academy of Sciences
2013-2023
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...
In this paper, we study stellar light curves from the TESS satellite (Transiting Exoplanet Survey Satellite) for presence of flares. The main aim is to detect flares using two-minutes cadence data and perform statistical analysis. To find analyze prepared automatic software WARPFINDER. We implemented three methods described in paper: trend, difference, profile fitting. Automated search was accompanied by visual inspection. Using our analyzed two-minute 330,000 stars located first 39 sectors...
A new methodology is given to determine basic parameters of flares from their X-ray light curves. Algorithms are developed the analysis small occurring during deep solar minimum 2009, between Solar Cycles 23 and 24, observed by Polish Photometer in X-rays (SphinX) on Complex Orbital Observations Near-Earth Activity Sun-Photon (CORONAS-Photon) spacecraft. One a semi-automatic flare detection procedure that gives start, peak, end times for single ("elementary") events under assumption curve...
The X-ray light curves in the 0.4-1.5 keV and 2-7 bands of RS CVn binary AR Lacertae observed on 1993 June 1-3 over one full orbital cycle with ASCA satellite have been used to map spatial structure Lac's coronae. We find that both stars are active, corona K-type secondary star appears be hotter than G-type primary star, emission is concentrated sides facing each other, there compact well-localized regions enhanced heights much smaller stellar radii. In class solutions additional extended...
SphinX (Solar PHotometer IN X-rays), a full-disk-integrated spectrometer, observed 137 flare-like/transient events with active region (AR) 11024 being the only AR on disk. The Hinode X-Ray Telescope (XRT) and Solar Optical observe 67 of these identified their location from 12:00 UT July 3 through 24:00 2009 7. We find that predominant mechanisms for flares by XRT are (1) flux cancellation (2) shearing underlying magnetic elements. Point- cusp-like flare morphologies seen all occur in...
We studied light curves of GJ 1243, YZ CMi, and V374 Peg, observed by TESS for the presence stellar spots flares. One main goals was to model spotted stars estimate number along with their parameters using our original BASSMAN software. The modeled were subtracted from observations increase efficiency flare detection. Flares detected automatically new dedicated software WARPFINDER. estimated two on 1243 mean temperature about 2800$\,$K spottedness varying between $3\%-4\%$ surface Peg a...
The SphinX X-ray spectrophotometer on the CORONAS–PHOTON spacecraft measured soft emission in 1–15 keV energy range during deep solar minimum of 2009 with a sensitivity much greater than GOES. Several intervals are identified when flux was exceptionally low, and luminosity estimated. Spectral fits to at these times give temperatures 1.7–1.9 MK measures between 4 × 1047 cm−3 1.1 1048 cm−3. Comparing that from Hinode Telescope, we deduce most is general coronal structures rather confined...
The DIOGENESS X-ray crystal spectrometer on the CORONAS-F spacecraft operated only for a single month (25 August to 17 September) in 2001, but its short lifetime obtained one hundred and forty high-resolution spectra of eight solar flares with GOES importance ranging from C9 X5. instrument included four scanning flat crystals wavelength ranges covering regions Si xiii (6.65 Å), S xv (5.04 Ca xix (3.18 Å) lines associated dielectronic satellites. Two were oriented “dopplerometer” manner, i.e....
We present here a brief description of thirteen events the narrowband solar millisecond radio spike emissions observed between February 2000 and December 2001. The total observing time was 1990.4 h, collected during 357 days. data were with 15-m telescope fast radiospectrograph Toruń Observatory, Poland. dynamic spectra spikes recorded in 1352-1490 MHz frequency band split into 46 channels temporal resolution equals to 12 500 measurements per second channel. presented observations have...
In this paper, we analyze the energy budgets of two single-loop solar flares under assumption that non-thermal electrons (NTEs) are only source plasma heating during all phases both events. The were observed by RHESSI and GOES on 2002 September 20 March 17, respectively. For investigated derived fluxes contained in NTE beams from observational data constrained light curves. We showed delivered NTEs was fully sufficient to fulfill pre-heating impulsive as well decay phase one them. concluded...
We analysed hard and soft X-ray observations from the SXT HXT instruments on Yohkoh satellite of an X5.3 class flare 25 August 2001. The most prominent features this are: a fast (450 km s-1), (up to 90 keV) compact moving feature, two clear footpoint sources, loop-top emission between them. Yohkoh/HXT with high time cadences (0.5–1 s) revealed clear, quasi-periodic changes in asymmetry observed fluxes. Observed is usually interpreted as effect difference magnetic field strength or divergence...
In this Letter, we analyze soft X-ray (SXR) and hard (HXR) emission of the 2002 September 20 M1.8 GOES class solar flare observed by RHESSI satellites. event, SXR precedes onset main bulk HXR ∼5 minutes. This suggests that an additional heating mechanism may be at work early beginning flare. However, spectra indicate a presence non-thermal electrons also before impulsive phase. So, assumed dominant energy transport during rise phase flares is electron-beam-driven evaporation. We used...
<i>Aims. <i/>We investigate influence of variations in the energy spectrum non-thermal electrons on resulting <i>GOES<i/> classes solar flares.<i>Methods. <i/>Twelve observed flares with various soft-to-hard X-ray emission ratios were modeled using different electron distributions. Initial values flare physical parameters including geometrical properties estimated observations.<i>Results. found that, for a fixed total flare, class can change significantly by varying spectral index and low...
<i>Aims. <i/>The standard model of solar flares comprises a bulk expansion and rise abruptly heated plasma (chromospheric evaporation). Emission from ascending along loops rooted in the visible disk often should be dominated, at least temporally, by blue-shifted emission. However, there is only very limited number published observations having spectra which component dominates stationary one. In this work we compare observed X-ray three recorded during their impulsive phases relevant...
A simple iterative method for the three-dimensional deconvolution of X-ray light curves eclipsing binaries is presented. The procedure allows spatial distribution emission to be obtained without a priori assumptions about localization, number or size emitting structures. used mapping corona binary AR Lac.
The Sun recently underwent a period of remarkable lack major activity such as large flares and sunspots, without equal since the advent space age half century ago. A widely used measure solar is amount soft X‐ray emission, but until this has been below threshold X‐ray‐monitoring Geostationary Operational Environmental Satellites (GOES). There thus an urgent need for more sensitive instrumentation to record emission in range. Anticipating need, highly spectrophotometer called Solar Photometer...
We present a description of the recent advances in development KORTES assembly—the first solar oriented mission designed for Russian segment International Space Station. consists several imaging and spectroscopic instruments collectively covering wide spectral range extending from extreme ultraviolet (EUV) wavelengths to X-rays. The EUV telescopes inside will trace origin dynamics various phenomena, e.g., flares, CMEs, eruptions etc. spectra provided by grazing-incidence spectroheliographs...