Yu. T. Tsap
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View article: Propagation of coronal large-amplitude Alfvén-type waves to the solar photosphere
Propagation of coronal large-amplitude Alfvén-type waves to the solar photosphere Open
Context. We present a study of the propagation of magnetohydrodynamic (MHD) Alfvén-type waves from the solar corona to the photosphere, generated by the large-amplitude velocity pulse. Aims. We aim to estimate the energy flux and the propa…
View article: Review of: "Improving Our Knowledge of the Solar Near-Surface Shear Layer: The Special Case of the Leptocline"
Review of: "Improving Our Knowledge of the Solar Near-Surface Shear Layer: The Special Case of the Leptocline" Open
View article: Dreicer Electric Field Definition and Runaway Electrons in Solar Flares
Dreicer Electric Field Definition and Runaway Electrons in Solar Flares Open
We analyze electron acceleration by a large-scale electric field E in a collisional hydrogen plasma under the solar flare coronal conditions based on approaches proposed by Dreicer and Spitzer for the dynamic friction force of electrons. T…
View article: Sub-THz emission from stellar flares and energy release diagnostics
Sub-THz emission from stellar flares and energy release diagnostics Open
A comparative analysis of sub-THz emission of stellar flares from red dwarfs has been carried out. ALMA observations indicate that the sub-THz emission flux from stellar flares with a duration of 10 s is an order of magnitude greater than …
View article: Pre-impulsive and Impulsive Phases of the Sub-Terahertz Flare of March 28, 2022
Pre-impulsive and Impulsive Phases of the Sub-Terahertz Flare of March 28, 2022 Open
Properties of the solar radio spectrum, as well as the temporal profiles of\nflare emission, indicate the thermal nature of the sub-terahertz (sub-THz)\ncomponent observed as the growth of radio emission in the frequency range of\n100-1000…
View article: Thermal instability in the impulsive phase of solar flares with sub-THz component
Thermal instability in the impulsive phase of solar flares with sub-THz component Open
Coronal rain is formed in the post-impulsive phase of solar flares due to the thermal instability of coronal plasma in EUV loops. As a result, the sub-terahertz (sub-THz) emission flux in the post-impulsive phase of solar flares can be inc…
View article: DEPENDENCE OF SOLAR WIND SPEED ON THE AREA OF CORONAL HOLES AND THEIR FRACTAL DIMENSION
DEPENDENCE OF SOLAR WIND SPEED ON THE AREA OF CORONAL HOLES AND THEIR FRACTAL DIMENSION Open
Recently, Samara et al. [1] have shown that proportionality between the solar fast windvelocity V ofthe coronal holes (CHs) and their areaS is satisfied only for small-sized CHs, whilethe saturation effect for larger CHs is revealed, i.e.,…
View article: WHITE-LIGHT FLARES AND SOLAR PHOTOSPHERE HEATING BY ALFVÉN WAVES
WHITE-LIGHT FLARES AND SOLAR PHOTOSPHERE HEATING BY ALFVÉN WAVES Open
View article: ON THE NATURE OF 04.05.22 SOLAR FLARE EMISSION AT THE POST-IMPULSIVE PHASE
ON THE NATURE OF 04.05.22 SOLAR FLARE EMISSION AT THE POST-IMPULSIVE PHASE Open
View article: On the Kink Instability of Twisted Coronal Loops: Nonneutralized Electric Current
On the Kink Instability of Twisted Coronal Loops: Nonneutralized Electric Current Open
Based on linear magnetohydrodynamic equations and an energy principle we analyze the ideal kink instability of a twisted force-free coronal loop (flux rope) surrounded by an outer potential magnetic field by using the sharp-boundary approx…
View article: Transverse oscillations of a quiescent solar filament observed at the 304 Å EUV passband
Transverse oscillations of a quiescent solar filament observed at the 304 Å EUV passband Open
Quasi-periodic transverse oscillations of a quiescent solar filament based on the Hα and the 304 Å EUV intensity maps have been studied. Time-distance diagrams of filament intensity variations were produced. The method of the identificatio…
View article: Flare energy release and avalanche ionization of plasma by runaway electrons in lower solar atmosphere
Flare energy release and avalanche ionization of plasma by runaway electrons in lower solar atmosphere Open
The analysis of the electron acceleration by the quasi-stationary sub-Dreiser electric fields in the lower solar atmospherehas been done. It has been shown that the Dreiser electric field turned out to be several orders of magnitude larger t…
View article: PRECURSORS AND SUB-TERAHERTZ EMISSION OF A SOLAR FLARE ON MARCH 28, 2022
PRECURSORS AND SUB-TERAHERTZ EMISSION OF A SOLAR FLARE ON MARCH 28, 2022 Open
View article: ON THE RELATIONSHIP SOLAR ENERGETC PARTICLES WITH TYPE II RADIO BURSTS
ON THE RELATIONSHIP SOLAR ENERGETC PARTICLES WITH TYPE II RADIO BURSTS Open
View article: SUB-TERAHERTZ EMISSION FROM FLARING STARS
SUB-TERAHERTZ EMISSION FROM FLARING STARS Open
A comparative analysis of flares on red dwarf Prox Cent was carried out.ALMA observations show that sub-terahertz radiation from stars is an order of magnitude greater than typical values observed on the Sun.Besides, flaring stars have dec…
View article: Erratum to: Numerical Simulation of Sub-Terahertz Thermal Emission: RADYN Code
Erratum to: Numerical Simulation of Sub-Terahertz Thermal Emission: RADYN Code Open
An Erratum to this paper has been published: https://doi.org/10.1134/S0016793221070288
View article: ON THE CORRELATION OF SOLAR ACTIVITY AND EVOLUTION OF SUNSPOT MAGNETIC FIELDS BASED ON TST-2 CRAO MEASUREMENTS: CYCLES 22–24
ON THE CORRELATION OF SOLAR ACTIVITY AND EVOLUTION OF SUNSPOT MAGNETIC FIELDS BASED ON TST-2 CRAO MEASUREMENTS: CYCLES 22–24 Open
View article: ON THE ORIGIN OF LONG PERIOD ALFVEN WAVES IN THE SOLAR CORONA
ON THE ORIGIN OF LONG PERIOD ALFVEN WAVES IN THE SOLAR CORONA Open
Alfvan wave penetration with periods exceeding a few tens of minutes generated by convective plasma motions in the lower solar atmosphere is considered.The sharp boundary approximation between the chromosphere and the corona is used.It has…
View article: SUB-TERAHERTZ OBSERVATIONS OF SOLAR PROMINENCES AT 93 AND 140 GHZ
SUB-TERAHERTZ OBSERVATIONS OF SOLAR PROMINENCES AT 93 AND 140 GHZ Open
New sub-THz observations of a solar prominence obtained on March 30, 2021 at frequencies of 93 and 140 GHz were carried out based on the data of the RT-7.5 radio telescope operated by Bauman Moscow State Technical University.A new techniqu…
View article: Flare energy release and avalanche ionization of plasma by runaway electrons in lower solar atmosphere
Flare energy release and avalanche ionization of plasma by runaway electrons in lower solar atmosphere Open
The analysis of the electron acceleration by the quasi-stationary sub-Dreiser electric fields in the lower solar atmosphere has been done. It has been shown that the Dreiser electric field turned out to be several orders of magnitude large…
View article: On the Stabilization of a Twisted Magnetic Flux Tube
On the Stabilization of a Twisted Magnetic Flux Tube Open
The linear magnetohydrodynamic stability of a shielding magnetic flux rope with a surface current under coronal solar conditions is analyzed in the framework of an energy principle. The equation describing the potential energy change induc…
View article: Measurements of strong magnetic fields in umbra of sunspots: Crimea vs Mt. Wilson
Measurements of strong magnetic fields in umbra of sunspots: Crimea vs Mt. Wilson Open
The comparative analysis for 1324 measurements of the corresponding sunspot magnetic fields with B > 2.5 kG (according to Crimean data) obtained at Crimean and Mt. Wilson observatories from 2010 to 2017 has been carried out. It has been sh…
View article: CROMOSPHERIC CONDENSATION AND SUB-TERAHETZ EMISSION FROM SOLAR FLARES
CROMOSPHERIC CONDENSATION AND SUB-TERAHETZ EMISSION FROM SOLAR FLARES Open
View article: CONCENTRATION OF THE MAGNRTIC FIELD IN THE SOLAR CORONA AND THE FLUX ROPE TWIST
CONCENTRATION OF THE MAGNRTIC FIELD IN THE SOLAR CORONA AND THE FLUX ROPE TWIST Open
The equilibrium of the axisymmetric cylindrical magnetic flux rope under solar coronal condition is considered.The influence of the azimuthal component of the magnetic fields on its stability is discussed.Based on the Gold-Hole magnetic co…
View article: ON THE TIME DELAYS BETWEEN SUB-TERAHERTZ AND SOFT X-RAY EMISSION FROM SOLAR FLARES
ON THE TIME DELAYS BETWEEN SUB-TERAHERTZ AND SOFT X-RAY EMISSION FROM SOLAR FLARES Open
View article: ON THE ESTIMATION OF THE ENERGY FLUX OF ALFVÉN WAVES IN THE LOWER SOLAR ATMOSPHERE BASED ON DOPLER VELOCITY MEASUREMENTS
ON THE ESTIMATION OF THE ENERGY FLUX OF ALFVÉN WAVES IN THE LOWER SOLAR ATMOSPHERE BASED ON DOPLER VELOCITY MEASUREMENTS Open
View article: ON THE RELATIONSHIP OF CORONAL HOLES OF MIDDLE AND LOW LATITUDES WITH THE GENERAL MAGNETIC FIELD OF THE SUN
ON THE RELATIONSHIP OF CORONAL HOLES OF MIDDLE AND LOW LATITUDES WITH THE GENERAL MAGNETIC FIELD OF THE SUN Open
View article: ON THE SPLITTING OF BANDS ON THE DYNAMIC SPECTRA OF TYPE II RADIO BURSTS
ON THE SPLITTING OF BANDS ON THE DYNAMIC SPECTRA OF TYPE II RADIO BURSTS Open
Based on the analysis of dynamic spectra of solar flare radiation in the meter wavelength range obtained with RSTN the evolution of the split parameters of type II solar radio bursts is considered.The relative band-splitting behaves non-mo…
View article: CORONAL LOOPS AND OPTICAL EMISSION FROM FLARING STARS
CORONAL LOOPS AND OPTICAL EMISSION FROM FLARING STARS Open
View article: M-CLASS SOLAR FLARE FEATURES OBSERVED WITH RT-7.5 BMSTU RADIO TELESCOPE
M-CLASS SOLAR FLARE FEATURES OBSERVED WITH RT-7.5 BMSTU RADIO TELESCOPE Open