A5082387702- Astrophysical Phenomena and Observations
- Solar and Space Plasma Dynamics
- Astrophysics and Cosmic Phenomena
- Pulsars and Gravitational Waves Research
- Astrophysics and Star Formation Studies
- Gamma-ray bursts and supernovae
- Infrared Target Detection Methodologies
- Particle Accelerators and Free-Electron Lasers
- Magnetic Properties of Alloys
- Superconducting Materials and Applications
- Oil, Gas, and Environmental Issues
- Astro and Planetary Science
- Space exploration and regulation
- Solar Radiation and Photovoltaics
- Electromagnetic Effects on Materials
- High-pressure geophysics and materials
- Particle accelerators and beam dynamics
- Geomagnetism and Paleomagnetism Studies
- Magnetic and Electromagnetic Effects
- Color Science and Applications
- Stellar, planetary, and galactic studies
- Impact of Light on Environment and Health
Nicolaus Copernicus Astronomical Center
2015-2024
Polish Academy of Sciences
2015-2024
University of Wrocław
2015-2016
A soft X-ray excess above the 2-10 keV power law extrapolation is generally observed in AGN spectra. Presently there are two competitive models to explain it: blurred ionized reflection and warm Comptonisation. In latter case, observations suggest a corona temperature $\sim$ 1 optical depth 10. Moreover, radiative constraints from spectral fits with Comptonisation that most of accretion should be released corona. The disk below basically non-dissipative, radiating only reprocessed emission...
This paper is devoted to self-consistent modeling of the magnetically supported accretion disk with optically thick warm corona based on first principles. In our model, we consider gas heating by magneto-rotational instability (MRI) dynamo. Our goal show that proper calculation magnetic dynamo can build up warm, above around black hole stellar mass. Using vertical model and heated field together radiative transfer in hydrostatic equilibrium developed relaxation numerical scheme which allows...
Context. Warm corona is a possible explanation for Soft X-ray Excess in Active Galactic Nuclei (AGN). This paper contains self consistent modeling of both: accretion disk with optically thick corona, where the gas heated by magneto-rotational instability dynamo (MRI), and cooled radiation which undergoes free-free absorption Compton scattering. Aims. We determine parameters warm AGN using disk-corona structure model that takes into account magnetic pressure. aim to show role thermal (TI) as...
Context. Detections of the X-ray spectra active galactic nuclei (AGNs) typically reveal a noticeable excess soft X-rays beyond extrapolation power-law trend observed between 2 and 10 keV. However, cause this surplus remains unclear. In scenario Comptonization, observations suggest warm corona temperature, ranging from 0.1 to 1 keV, an optical depth approximately 30. Furthermore, according radiative constraints derived spectral analyses employing Comptonization models, it has been suggested...
Abstract It is well known that not all solar flares are connected with eruptions followed by coronal mass ejection (CME). Even strongest X-class may be accompanied or failed eruptions. One of important factor prevent eruption from developing into CME strength the magnetic field overlying flare site. Few observations show active regions specific configuration produce many CME-less flares. Therefore, forecasts geoeffective events based on region properties have to take account probability...
Abstract In this paper we present our attempt to constrain the first catalog of solar failed eruptions. We used automatic algorithm that is able search for dynamic features in Solar Dynamics Observatory (SDO)/Atmospheric Imaging Assembly (AIA) database. ran on entire SDO/AIA 171 Å data set. For time interval from 2010 May 20 2019 found 12,192 events. The events were classified three groups. Apart eruptions (1214) obtained a large group successful (2064) and other (8914). enabled us collect...
Lyndsay Fletcher, Arkadiusz Berlicki, Arun Kumar Awasthi and Dominik Gronkiewicz describe how they established F-HUNTERS, a pro–am solar flare observing campaign.