ONDES, TURBULENCE ET PHENOMENES DISSIPATIFS DANS LE VENT SOLAIRE A PARTIR DES OBSERVATIONS DE LA SONDE WIND PDF Download
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Author: CHADI.. SALEM
Publisher:
ISBN:
Category :
Languages : fr
Pages : 309
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Book Description
CE TRAVAIL EST LIE A UN PROBLEME CLE, RELEVANT A LA FOIS DE LA PHYSIQUE SPATIALE ET DE LA PHYSIQUE FONDAMENTALE, QUI EST LA CARACTERISATION DES PHENOMENES DISSIPATIFS DANS UN MILIEU TURBULENT FAIBLEMENT COLLISIONNEL. DE PAR SES PROPRIETES QUE L'ON MESURE IN-SITU GRACE AUX SONDES SPATIALES, LE VENT SOLAIRE CONSTITUE UN LABORATOIRE IDEAL POUR CE TYPE D'ETUDES. LE BUT DE CETTE THESE EST D'ANALYSER LES FLUCTUATIONS ASSOCIEES AU VENT SOLAIRE ET DE DONNER, POUR LA PREMIERE FOIS, UNE VUE GLOBALE DES PHENOMENES AYANT LIEU SUR UNE TRES GRANDE GAMME D'ECHELLES, ALLANT DES ECHELLES MACROSCOPIQUES MHD (BASSES FREQUENCES) AUX ECHELLES CINETIQUES (HAUTES FREQUENCES), OU LA DISSIPATION EST SUPPOSEE JOUER UN ROLE IMPORTANT. NOUS UTILISONS POUR CELA LES OBSERVATIONS FOURNIES PAR LA NOUVELLE GENERATION D'INSTRUMENTS (MESURANT LES ONDES ET LES PARTICULES) EMBARQUES SUR LA SONDE SPATIALE WIND, DONT LES HAUTES RESOLUTIONS TEMPORELLES (JUSQU'A UNE DIZAINE DE MICROSECONDES) ET SPECTRALES (QUELQUES HZ) N'ONT JAMAIS ETE ATTEINTES AUPARAVANT DANS LE VENT SOLAIRE. CETTE HAUTE RESOLUTION A PERMIS DE REVELER QUE, CONTRAIREMENT A LA TURBULENCE A BASSE FREQUENCE, LES ONDES A HAUTE FREQUENCE SONT TRES COHERENTES. CE TRAVAIL SE DIVISE EN TROIS PARTIES : (1) L'ETUDE DES ONDES ELECTROSTATIQUES COHERENTES A PARTIR DE L'ANALYSE DU BRUIT ELECTROMAGNETIQUE A HAUTE FREQUENCE MESURE PAR L'EXPERIENCE WAVES ; (2) L'ETUDE DES PROPRIETES GLOBALES DES PROTONS ET DES ELECTRONS DU VENT SOLAIRE VIA L'ANALYSE DES FONCTIONS DE DISTRIBUTION DES PARTICULES OBTENUES PAR L'EXPERIENCE 3D-PLASMA ; (3) L'ETUDE DE LA TURBULENCE A BASSE FREQUENCE A PARTIR DU CHAMP MAGNETIQUE MESURE PAR L'EXPERIENCE MFI ET DES DONNEES PARTICULES OBTENUES PAR L'EXPERIENCE 3D-PLASMA.
Author: CHADI.. SALEM
Publisher:
ISBN:
Category :
Languages : fr
Pages : 309
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Book Description
CE TRAVAIL EST LIE A UN PROBLEME CLE, RELEVANT A LA FOIS DE LA PHYSIQUE SPATIALE ET DE LA PHYSIQUE FONDAMENTALE, QUI EST LA CARACTERISATION DES PHENOMENES DISSIPATIFS DANS UN MILIEU TURBULENT FAIBLEMENT COLLISIONNEL. DE PAR SES PROPRIETES QUE L'ON MESURE IN-SITU GRACE AUX SONDES SPATIALES, LE VENT SOLAIRE CONSTITUE UN LABORATOIRE IDEAL POUR CE TYPE D'ETUDES. LE BUT DE CETTE THESE EST D'ANALYSER LES FLUCTUATIONS ASSOCIEES AU VENT SOLAIRE ET DE DONNER, POUR LA PREMIERE FOIS, UNE VUE GLOBALE DES PHENOMENES AYANT LIEU SUR UNE TRES GRANDE GAMME D'ECHELLES, ALLANT DES ECHELLES MACROSCOPIQUES MHD (BASSES FREQUENCES) AUX ECHELLES CINETIQUES (HAUTES FREQUENCES), OU LA DISSIPATION EST SUPPOSEE JOUER UN ROLE IMPORTANT. NOUS UTILISONS POUR CELA LES OBSERVATIONS FOURNIES PAR LA NOUVELLE GENERATION D'INSTRUMENTS (MESURANT LES ONDES ET LES PARTICULES) EMBARQUES SUR LA SONDE SPATIALE WIND, DONT LES HAUTES RESOLUTIONS TEMPORELLES (JUSQU'A UNE DIZAINE DE MICROSECONDES) ET SPECTRALES (QUELQUES HZ) N'ONT JAMAIS ETE ATTEINTES AUPARAVANT DANS LE VENT SOLAIRE. CETTE HAUTE RESOLUTION A PERMIS DE REVELER QUE, CONTRAIREMENT A LA TURBULENCE A BASSE FREQUENCE, LES ONDES A HAUTE FREQUENCE SONT TRES COHERENTES. CE TRAVAIL SE DIVISE EN TROIS PARTIES : (1) L'ETUDE DES ONDES ELECTROSTATIQUES COHERENTES A PARTIR DE L'ANALYSE DU BRUIT ELECTROMAGNETIQUE A HAUTE FREQUENCE MESURE PAR L'EXPERIENCE WAVES ; (2) L'ETUDE DES PROPRIETES GLOBALES DES PROTONS ET DES ELECTRONS DU VENT SOLAIRE VIA L'ANALYSE DES FONCTIONS DE DISTRIBUTION DES PARTICULES OBTENUES PAR L'EXPERIENCE 3D-PLASMA ; (3) L'ETUDE DE LA TURBULENCE A BASSE FREQUENCE A PARTIR DU CHAMP MAGNETIQUE MESURE PAR L'EXPERIENCE MFI ET DES DONNEES PARTICULES OBTENUES PAR L'EXPERIENCE 3D-PLASMA.
Author: Roberto Bruno
Publisher: Springer
ISBN: 3319434403
Category : Science
Languages : en
Pages : 270
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Book Description
This book provides an overview of solar wind turbulence from both the theoretical and observational perspective. It argues that the interplanetary medium offers the best opportunity to directly study turbulent fluctuations in collisionless plasmas. In fact, during expansion, the solar wind evolves towards a state characterized by large-amplitude fluctuations in all observed parameters, which resembles, at least at large scales, the well-known hydrodynamic turbulence. This text starts with historical references to past observations and experiments on turbulent flows. It then introduces the Navier-Stokes equations for a magnetized plasma whose low-frequency turbulence evolution is described within the framework of the MHD approximation. It also considers the scaling of plasma and magnetic field fluctuations and the study of nonlinear energy cascades within the same framework. It reports observations of turbulence in the ecliptic and at high latitude, treating Alfvénic and compressive fluctuations separately in order to explain the transport of mass, momentum and energy during the expansion. Further, existing models are compared with direct observations in the heliosphere. The problem of self-similar and anomalous fluctuations in the solar wind is then addressed using tools provided by dynamical system theory and discussed on the basis of available models and observations. The book highlights observations of Yaglom’s law in solar wind turbulence, which is one of the most important findings in fully developed turbulence and directly related to the long-lasting and still unsolved problem of solar wind plasma heating. Lastly, it includes a short chapter dedicated to the kinetic range of fluctuations, which has recently been receiving more attention from the space plasma community, since this is inherently related to turbulent energy dissipation and consequent plasma heating. It particularly focuses on the nature and role of the fluctuations populating this frequency range, and discusses several model predictions and recent observational findings in this context.
Author: Jean-Pierre Rozelot
Publisher: Springer
ISBN: 3540337598
Category : Science
Languages : en
Pages : 176
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Book Description
This book comprises an excursion through space weather, a scientific topic in rapid growth and with growing impact and implications for technological societies. The text is aimed at students and scientists working, or interested in, the field and provides a thorough introduction to the topic for those who wish to become acquainted with the basic solar physics at the origin of space weather.
Author: Gérard Belmont
Publisher: John Wiley & Sons
ISBN: 3527656243
Category : Science
Languages : en
Pages : 389
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Book Description
Collisionless Plasmas in Astrophysics examines the unique properties of media without collisions in plasma physics. Experts in this field, the authors present the first book to concentrate on collisionless conditions in plasmas, whether close or not to thermal equilibrium. Filling a void in scientific literature, Collisionless Plasmas in Astrophysics explains the possibilities of modeling such plasmas, using a fluid or a kinetic framework. It also addresses common misconceptions that even professionals may possess, on phenomena such as "collisionless (Landau) damping". Abundant illustrations are given in both space physics and astrophysics.
Author: C.-Y. Tu
Publisher: Springer Science & Business Media
ISBN: 9401585415
Category : Science
Languages : en
Pages : 214
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Book Description
This is the first book to give a comprehensive overview of recent observational and theoretical results on solar wind structures and fluctuations and magnetohydrodynamic waves and turbulence, preference being given to phenomena in the inner heliosphere. Emphasis is placed on the progress made in the past decade in the understanding of the nature and origin of especially small-scale, compressible and incompressible fluctuations. Turbulence models describing the spatial transport and spectral transfer of the fluctuations in the inner heliosphere are discussed. Intermittency of solar wind fluctuations and their statistical distributions are investigated. Studies of the heating and acceleration effects of the turbulence on the background wind are critically surveyed. Finally, open questions concerning the origin, nature and evolution of the fluctuations are listed, and perspectives for future research are outlined. The book is for graduate students and researchers in the field. Other target groups are scientists and professionals interested in space plasma physics and/or MHD turbulence.
Author: Dastgeer Shaikh
Publisher: AIP Conference Proceedings / A
ISBN:
Category : Science
Languages : en
Pages : 454
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Book Description
This book contains the peer-reviewed papers presented at the Sixth Annual International Astrophysics Conference. This conference brought together a range of topics that shed light on our understanding and status of turbulence and nonlinear processes in astrophysical plasmas. Coverage in this volume includes turbulent relaxation in laboratory and space plasmas and its application to coronal flux tubes, coronal heating, and the diffusion of energetic particles.
Author: Munehito Shoda
Publisher: Springer Nature
ISBN: 9811610304
Category : Science
Languages : en
Pages : 94
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Book Description
This book discusses key theoretical aspects concerning the formation of the solar wind: the most essential building block in the heliosphere, in which planets orbit. To understand the influence of solar activity on planetary magnetospheres and atmospheres, we need to first understand the origin of the solar wind, which is still under debate. This book presents the outcomes of state-of-the-art numerical simulations of solar wind acceleration, including the first three-dimensional simulation of the turbulence-driven solar wind model. One of the book’s goals is to include compressional effects in the dynamics of solar wind turbulence; accordingly, it discusses parametric decay instability in detail. Several key aspects that are relevant to the Parker Solar Probe observations are also discussed. Given its scope, the book plays a key role in bridging the gap between the theory of magnetohydrodynamic turbulence and current/future in-situ observations of the solar wind. This book is based on the Ph.D. thesis by the author, which won the 2019 International Astronomical Union Division E Ph.D. prize.
Author: Roberto Bruno
Publisher:
ISBN: 9783319434414
Category : Plasma turbulence
Languages : en
Pages : 267
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Book Description
This book provides an overview of solar wind turbulence from both the theoretical and observational perspective. It argues that the interplanetary medium offers the best opportunity to directly study turbulent fluctuations in collisionless plasmas. In fact, during expansion, the solar wind evolves towards a state characterized by large-amplitude fluctuations in all observed parameters, which resembles, at least at large scales, the well-known hydrodynamic turbulence. This text starts with historical references to past observations and experiments on turbulent flows. It then introduces the Navier-Stokes equations for a magnetized plasma whose low-frequency turbulence evolution is described within the framework of the MHD approximation. It also considers the scaling of plasma and magnetic field fluctuations and the study of nonlinear energy cascades within the same framework. It reports observations of turbulence in the ecliptic and at high latitude, treating Alfvénic and compressive fluctuations separately in order to explain the transport of mass, momentum and energy during the expansion. Further, existing models are compared with direct observations in the heliosphere. The problem of self-similar and anomalous fluctuations in the solar wind is then addressed using tools provided by dynamical system theory and discussed on the basis of available models and observations. The book highlights observations of Yaglom's law in solar wind turbulence, which is one of the most important findings in fully developed turbulence and directly related to the long-lasting and still unsolved problem of solar wind plasma heating. Lastly, it includes a short chapter dedicated to the kinetic range of fluctuations, which has recently been receiving more attention from the space plasma community, since this is inherently related to turbulent energy dissipation and consequent plasma heating. It particularly focuses on the nature and role of the fluctuations populating this frequency range, and discusses several model predictions and recent observational findings in this context.
Author:
Publisher:
ISBN:
Category : Astrophysics
Languages : en
Pages : 726
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Book Description
Author: Marco Velli
Publisher: American Institute of Physics
ISBN: 9780735401488
Category : Science
Languages : en
Pages : 886
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Book Description
The Tenth Solar Wind conference describes the latest results in the physics of the outer solar atmosphere, the solar wind, and the interplanetary medium which together comprise the heliosphere. The conference brought together researchers studying the sun and its influence on the earth’s space environment both from an experimental and theoretical point of view. The effect of the solar magnetic field in shaping and accelerating the solar wind throughout the solar cycle, via coronal heating and coronal mass ejections was described in unprecedented clarity and breadth, thanks to both satellite experiments and numerical modelling. The conference proceedings is of interest to researchers in space science and the geomagnetic effects of solar activity, plasma physicists and astrophysicists as well as other scientists interested in the life of our mother star.
