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## Безотражательное распространение акустических волн в атмосфере Солнца

Письма в Астрономический журнал. 2012. Т. 38. № 6. С. 439-445.

The possibility that vertical acoustic waves with frequencies lower than the cutoff frequency corresponding to the temperature minimum pass this minimum is investigated. It is shown that the averaged temperature profile in the solar atmosphere can be approximated by several so-called reflectionless profiles on which the acoustic waves propagate without internal reflection. The possibility of the penetration of vertical acoustic waves, including low-frequency ones, into the solar corona is explained in this way.

Bespalov P. A., Savina O. N., Письма в Астрономический журнал 2008 Т. 34 № 5 С. 378-386

The generalized Wiedemann-Franz law for a nonisothermal quasi-neutral plasma with developedion-acoustic turbulence and Coulomb collisions has been proven. The results obtained are used to explain the anomalously low thermal conductivity in the chromosphere-corona transition region of the solar atmosphere. Model temperature distributions in the lower corona and the transition region that correspond to well-known experimental ...

Added: December 12, 2012

Bespalov P. A., Savina O. N., Письма в Астрономический журнал 2009 Т. 35 № 5 С. 382-388

Based on model calculations, we show that ion-acoustic oscillations can be excited by heat fluxes in a plasma. We discuss the probable effect of ion-acoustic oscillations on the formation of temperature gradients at critical heat fluxes. The local critical heat flux in the transition region of the solar atmosphere is close to the well-known experimental ...

Added: December 12, 2012

Petrukhin N., Pelinovsky E., Batsyna E. K., Astronomy Letters 2012 Vol. 38 No. 6 P. 388-393

The possibility that vertical acoustic waves with frequencies lower than the cutofffrequency corresponding to the temperature minimum pass this minimum is investigated. It is shown that the averaged temperature profile in the solar atmosphere can be approximated by several so-called reflectionless profiles onwhich the acousticwaves propagate without internal reflection. The possibility of the penetration of ...

Added: March 23, 2014

O.N. Savina, , in : RECENT ADVANCES on COMPUTATIONAL SCIENCE and APPLICATIONS. [Proceedings of the 4th International Conference on Applied and Computational Mathematics (ICACM '15)]. Issue 52: Mathematics and Computers in Science and Engineering Series.: Seul : World Scientific and Engineering Academy and Society, 2015. P. 19-22.

Analytically and numerically calculations according to the original effective algorithms for largescale
acoustic-gravity wave perturbations in the chromosphere from sources at the level of the photosphere are
analyzed. Limitations to the energy flux of acoustic-gravity waves from the photosphere through the
chromosphere are formulated. Structure of a narrow region with elevated pressure at the resonance altitude
where the horizontal ...

Added: October 13, 2015

Savina O. N., Bespalov P. A., Central European Astrophysical Bulletin 2011 Vol. 35 No. 1 P. 83-91

Within the framework of model calculations the possibility of occurrence of the ion-acoustic oscillation instability in a plasma without current and particle fluxes, but with an anisotropic distribution function, which corresponds to heat flux is shown. The model distribution function was selected taking into account the medium conditions. The increment of ion-acoustic oscillation is investigated ...

Added: December 12, 2012

Petrukhin N., Pelinovsky E., Batsyna E. K., Геомагнетизм и аэрономия 2012 Т. 52 № 6 С. 854-860

The vertical wave propagation in an inhomogeneous compressible atmosphere is studied in the framework of a linear theory. Under specific conditions imposed on atmospheric parameters, solutions can be found in the form of propagating waves with variable amplitudes and wave numbers that do not reflect in the atmosphere in spite of its strong inhomogeneity. Model ...

Added: November 9, 2012

Bespalov P. A., O.N. Savina, Astronomy Letters 2015 Vol. 41 No. 10 P. 601-605

We discuss the connection of the formation and properties of solar atmosphere transition region
characterized by a steep electron temperature gradient with electrostatic turbulence, which provides a high
effective electron collision frequency and a low thermal conductivity of the medium. A simple dependence
of the noise electric field in the transition region on the effective collision frequency has ...

Added: September 30, 2015

Petrukhin N., Batsyna E. K., Pelinovsky E., Письма в Журнал экспериментальной и теоретической физики 2011 Т. 93 № 10 С. 625-628

The vertical propagation of acoustic waves in the inhomogeneous compressible atmosphere has been studied in the framework of the linear theory of ideal hydrodynamics. It has been shown that the initial equations under certain conditions can be reduced to the Klein–Gordon equation with constant coefficients. Its solutions describe traveling waves with a variable amplitude and ...

Added: November 9, 2012

Sharykin I.N., Zimovets I. I., Myshyakov I. V. et al., Astrophysical Journal 2018 Vol. 864 No. 2, article id. 156 P. 1-18

We present the study of the SOL2015-03-15 M1.2 flare, revealing acceleration of electrons and plasma heating in the sheared twisted magnetic structure at the polarity inversion line (PIL). The purpose is to make an analysis of nonthermal electron dynamics and plasma heating in the highly stressed magnetic loops interacting at the PIL by using X-ray, ...

Added: February 1, 2020

П.А. Беспалов, О.Н. Савина, Письма в Астрономический журнал 2015 Т. 41 № 10 С. 651-656

The connection of between the formation and properties of areas characterized by the sharp gradient of electron temperature, with electrostatic turbulence, providing high a high effective electrons collision frequency and a low thermal conductivity of medium, is discussed. Simple dependences for the thermal conductivity, effective collision frequency and noise electric fields are obtained. For ...

Added: June 4, 2015

Bespalov P. A., Savina O.N., Central European Astrophysical Bulletin 2015 Vol. 39 P. 43-50

Special features of the ion-acoustic oscillation instability in the transition region
of a quiet solar atmosphere are examined. A model of electron distribution function,
which corresponds to the heat flux, under condition of absence of a particular beam, is
analyzed. It is shown that the heat flux-related anisotropy of the distribution function is
sufficient for the achievement of the ...

Added: November 26, 2014

Batsyna E. K., В кн. : XVII Нижегородская сессия молодых ученых. Естественные, математические науки. : Н. Новгород : НИУ РАНХиГС, 2012. С. 177-180.

Рассматривается распространение акустического излучения в плоскослоистой атмосфере Солнца. Показана возможность проникновения волн на большие расстояния. ...

Added: February 18, 2013

Sadykov V. M., Kosovichev A. G., Sharykin I.N. et al., Astrophysical Journal 2019 Vol. 871 No. 1, article id. 2 P. 1-13

We present a statistical study of chromospheric evaporation in solar flares using simultaneous observations by the RHESSI X-ray telescope and the Interface Region Imaging Spectrograph UV spectrograph. The results are compared with radiation hydrodynamic flare models from the F-CHROMA RADYN database. For each event, we study spatially resolved Doppler shifts of spectral lines formed in ...

Added: February 1, 2020

Savina O. N., Bespalov P. A., Radiophysics and Quantum Electronics 2012 Vol. 55 No. 4 P. 215-231

In the quiet low-latitude Earth's ionosphere, a sufficiently developed current system that is responsible for the Sq magnetic-field variations is formed in quiet Sun days under the action of tidal streams. The density of the corresponding currents is maximum in the midday hours at the equatorial latitudes, where the so-called equatorial electrojet is formed. In ...

Added: February 4, 2013

Petrukhin N., Ruderman M. S., Shurgalina E. G., Monthly Notices of the Royal Astronomical Society 2018 Vol. 474 No. 2 P. 2289-2301

We study damping of phase-mixed Alfvén waves propagating in non-reflective axisymmetric magnetic plasma configurations. We derive the general equation describing the attenuation of the Alfvén wave amplitude. Then we applied the general theory to a particular case with the exponentially divergent magnetic field lines. The condition that the configuration is non-reflective determines the variation of ...

Added: February 6, 2018

Savina O. N., Bespalov P. A., Central European Astrophysical Bulletin 2013 Vol. 37 No. 2 P. 507-512

Peculiarities of acoustic-gravity wave near the solar atmosphere transition region are analysed. An investigation is based on an original characteristic relation of waves in a two layers model with a temperature jump. Special attention is paid to an analysis of the properties of the surface waves, generated by the source of mass, which crosses the ...

Added: September 25, 2013

Ruderman M. S., Pelinovsky E., Petrukhin N. et al., Solar Physics 2013 Vol. 286 No. 2 P. 417-426

Propagating kink waves are ubiquitously observed in solar magnetic wave guides. We consider the possibility that these waves propagate without reflection although there is some inhomogeneity. We briefly describe the general theory of non-reflective, one-dimensional wave propagation in inhomogeneous media. This theory is then applied to kink-wave propagation in coronal loops. We consider a coronal ...

Added: March 28, 2013

Savina O.N., Bespalov P.A., Central European Astrophysical Bulletin 2016 Vol. 40 No. 1 P. 1-8

Some new features of the acoustic-gravity wave propagation from the sources at the photospheric heights through a nonisothermic solar chromosphere are examined. Within the framework of the plane-layered model of the atmosphere some properties of the wave perturbations near the height at which the horizontal phase wave velocity coincides with the local sound velocity are ...

Added: January 30, 2017

СПб. : ООО "Издательство ВВМ", 2019

Сборник содержит доклады, представленные на XXIII Всероссийскую ежегодную конференцию по физике Солнца «Солнечная и солнечно-земная физика – 2019» (7 – 11 октября 2019 года, ГАО РАН, Санкт-Петербург). Конференция проводилась Главной (Пулковской) астрономической обсерваторией РАН при финансовой поддержке Российского фонда фундаментальных исследований (грант 19-02-20010), секции «Солнце» Научного совета по астрономии РАН и секции «Плазменные процессы в ...

Added: December 25, 2019

Petrukhin N., Письма в Астрономический журнал 2014

The natural oscillations of coronal loops with constant density and variable magnetic fields varying parabolically are investigated. Using the method developed by the authors the wave equations with constant coefficients, describing kink oscillations of symmetric and asymmetric magnetic tubes, are obtained. For these models, analytical expressions for the spectra and amplitudes of oscillations, as well as the ...

Added: December 2, 2013

Kardanova E., Loyalka P., Chirikov I. et al., Assessment & Evaluation in Higher Education 2016 Vol. 41 No. 5 P. 770-786

Relatively little is known about differences in the quality of engineering education within and across countries because of the lack of valid instruments that allow for the assessment and comparison of engineering students’ skill gains. The purpose of our study is to develop and validate instruments that can be used to compare student skill gains ...

Added: April 7, 2016

Terekhovich V., Эпистемология и философия науки 2019 Т. 56 № 1 С. 169-184

The framework of simple opposition realism - anti-realism is not enough to analyze the views on the reality of unobservable objects of quantum theory. First, it is necessary to distinguish between realism in relation to the theory and realism in relation to the theory’s objects. Secondly, realism in relation to classical objects can be combined, ...

Added: February 12, 2020

Bilanenko E., Kamzolkina O., Grum-Grzhimaylo A. et al., Fungal Biology 2019 Vol. 123 No. 2 P. 140-150

Exploring life cycles of fungi is insightful for understanding their basic biology and can highlight their ecology. Here, we dissected the sexual and asexual life cycles of the obligate alkalophilic ascomycete Sodiomyces alkalinus that thrives at extremely high pH of soda lakes. Sodiomyces alkalinus develops acremonium-type asexual sporulation, commonly found in ascomycetous fungi. However, the ...

Added: October 3, 2019

Красноярск : ИВМ СО РАН, 2013

Труды Пятой Международной конференции «Системный анализ и информационные технологии» САИТ-2013 (19–25 сентября 2013 г., г.Красноярск, Россия): ...

Added: November 18, 2013