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COMMON PART

Project Number23-12-45023

Project titleInvestigation of the structure dynamics and the electromagnetic radiation excitation in the plasma envelopes of late spectral class stars and giant planets on the basis of a consistent analysis of macro- and microprocesses

Project LeadBespalov Peter

AffiliationFederal Research Center Institute of Applied Physics of the Russian Academy of Sciences,

Research area 02 - PHYSICS AND SPACE SCIENCES, 02-704 - Physics and evolution of stellar and interstellar medium

Keywordswave-particle interaction, anisotropic plasma, instabilities, radioemission, polarization, self-consistent structures, current sheets, brown dwarfs, Jupiter, Sun

PROJECT CONTENT

Annotation
The scientific results obtained over the three years of the project with the same name showed the promise of further studies of the mutual influence of microscopic (kinetic) phenomena and macroscopic (hydrodynamic) structures in the nonequilibrium plasma of late-type stars and planets. The scientific group, created on the basis of the Department of Astrophysics and Space Plasma Physics of the Institute of Applied Physics with the involvement of well-known scientists from the Space Research Institute and Higher School of Economics, in the Project 2023 will conduct research on the following topical issues: - Study of the possibility of implementation of the proposed by the authors of the Project 2020 special regime of interaction of short electromagnetic pulses and energetic electrons during the excitation of type I noise storms in the solar corona. Explanation of high energy and the rate of change in the spectral forms of radiation. Analysis of the results of a quantitative verification of the theory of the excitation of discrete electromagnetic radiation in space plasma. - Theoretical analysis of the model of the generation of spicules by torsion Alfven waves. Study of the dependence of the mass flow in a spicule on the thickness of the transition layer. The calculation results will be compared with observational data. - Study of transverse oscillations of a composite coronal loop based on a model with two parallel magnetic tubes. The calculations will take into account variations in the plasma density inside the tube in the longitudinal and transverse directions, as well as the presence of a flow and changes in density with time. The results obtained will be used in coronal seismology. - Theoretical analysis of restrictions on the distribution of background plasma in the atmosphere of a rotating brown dwarf, caused both by the entrainment of matter by the strong magnetic field of the star, and by the permutation instability threshold. Previously, the authors of Project 2020 considered the issues of excitation of radio emissions in the atmosphere of a brown dwarf. The new results are important for analyzing the conditions for the exit of electromagnetic radiation from the excitation region. -A detailed substantiation of the model put forward by the participants of the 2020 Project for the formation of a "burst in absorption", observed in the dynamic spectrum of Jupiter's radio emission with a "zebra-structure", the features of which were the existence of a bright emission band at the burst front and the presence of a quasi-harmonic structure in the background radiation. An analysis will be made of ion fluxes in the region of generation of decameter radio emission and their role in the formation of a fine frequency-time structure of this radiation. - Analytical and numerical study of new classes of self-consistent neutral current sheets, the formation of which is determined by the presence of a stellar wind and is expected in collisionless plasma shells of stars of late-type stars and planets. A comparative analysis will be carried out of the structures and stability of current sheets with anisotropic Maxwellian and Kappa particle energy distributions in the presence or absence of countercurrents of particles, the magnetic field's shear, the region of zero magnetic field, the crossing currents of electrons and ions. The results of Project 2023 are important for the development of observational technologies and the planning of new satellite missions, for the interpretation of observational data on quasi-static fields, turbulent structures, electromagnetic radiation and charged particle fluxes in the plasma shells of late-type stars and giant planets. The head of the scientific group Prof. P.A. Bespalov brought together, within the framework of Project 2023, three fruitfully working Doctors of Sciences (N.S. Petrukhin, M.S. Ruderman, V.E. Shaposhnikov), two high-level PhDs (D.N. Kobyakov, A.A. Nechaev) and four young scientists (V.Yu. Klimashov, P.D. Zharavina, G.M. Neshchetkin, T.V. Simonova), who have already entered in the research of this range of issues. Over the past 5 years, members of the scientific team have published dozens of scientific articles in leading scientific journals. The total number of references to the works of the group members is about 2000.

Expected results
The Project 2023 plans to study a wide range of topical problems of solar physics, planetary physics and astrophysics, which are interconnected by a common approach to a consistent analysis of macro- and microprocesses, which is a fundamental problem of space plasma physics. The importance of the problems under consideration, mainly related to phenomena in the plasma shells of stars and planets, is shown by the results of recent observations obtained by the most modern astrophysical instruments and space probes. As a result of the implementation of the Project 2023, the following results are expected. The possibility of implementation of the proposed by the authors of the project special regime of interaction of short electromagnetic pulses and energetic electrons using the BPA (beam-pulse-amplifier) mechanism for excitation of type I noise storms in the solar corona will be studied. On this basis, an explanation is expected of the high energy content and the rate of change in the spectral forms of radiation. As part of the analysis of high-resolution data from the spacecraft, a quantitative verification of the conclusions of the theory about the excitation of discrete electromagnetic radiation in space plasma will be performed. The dependence of the spicule formation efficiency on plasma parameters in homogeneous parts of a magnetic tube and on the thickness of the transition layer in the model of formation of spicules by torsion Alfven waves will be studied. It is expected that at a fixed plasma flow at the base of the magnetic tube, the plasma flow passed into the corona will be determined by the thickness of the transition layer and the duration of the pulse that excites the torsion Alfven wave. The influence of the cooling of the composite coronal loop on the amplitude of the loop's transverse oscillations will be studied within the framework of the model consisting of two parallel magnetic tubes. The excitation of transverse oscillations of a composite loop by a flow in magnetic tubes will be investigated. An explanation of the observational data on the connection between the excitation of the coronal loop by a plasma jet near the loop is expected. The results will be used in coronal seismology. A theoretical analysis will be made of the limitations on the distribution of the background plasma in the atmosphere of a rotating brown dwarf, which are caused both by the entrainment of matter by the strong magnetic field of the star and by the permutational instability threshold. Previously, the authors of the project considered the issues of excitation of radio emissions in the atmosphere of a brown dwarf. The new results are important for analyzing the conditions for the exit of electromagnetic radiation from the excitation region. A detailed justification will be given for the model put forward by the project participants of the formation of a “burst in absorption” observed in the dynamic spectrum of Jupiter’s radio emission with a “zebra-structure”, the features of which are the existence of a bright emission band at the burst front and the presence of a quasi-harmonic structure in the background radiation. An analysis will be made of ion fluxes in the region of generation of decameter radio emission and their role in the formation of a fine frequency-time structure of this radiation. New classes of self-consistent neutral current sheets, the formation of which is caused by the presence of a stellar wind and is expected in collisionless plasma shells of late-type stars and planets, will be analytically found and numerically investigated. A comparative analysis of the structures and stability of current sheets with anisotropic Maxwellian and Kappa particle energy distributions in the presence or absence of particle countercurrents, the magnetic field's shear, the region of zero magnetic field, and crossing currents of electrons and ions will be carried out. The results will determine the world level of theoretical studies of current sheets of this type in stellar coronas and outer parts of planetary magnetospheres. The expected results of the planned research are on the leading edge of the world astrophysical science. They are important for understanding fundamental plasma processes in space, interpreting observations of various macroscopic structures in cosmic plasma, and formulating tasks for new studies of the plasma shells of planets and stars, primarily the Sun, which determines the conditions of life on Earth. Not less than 9 articles in the leading scientific journals will be published according to the results of Project 2023. In this case we will try to preserve the tradition of Project 2020, as a result of realization of which it was published articles almost twice as much than it is indicated in the initial application.

REPORTS