Cosmic Electrodynamics - NAST008
Title: Kosmická elektrodynamika
Guaranteed by: Astronomical Institute of Charles University (32-AUUK)
Faculty: Faculty of Mathematics and Physics
Actual: from 2020
Semester: winter
E-Credits: 5
Hours per week, examination: winter s.:3/1, C+Ex [HT]
Capacity: unlimited
Min. number of students: unlimited
4EU+: no
Virtual mobility / capacity: no
State of the course: taught
Language: Czech
Teaching methods: full-time
Teaching methods: full-time
Guarantor: doc. RNDr. Ladislav Šubr, Ph.D.
doc. Mgr. Michal Švanda, Ph.D.
Classification: Physics > Astronomy and Astrophysics
Comes under: Doporučené přednášky 1/2
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Annotation -
Last update: T_AUUK (26.03.2015)
Basics of statistical physics. Basic definitions of plasma physics. Motion of charged particles in magnetic and electric fields. Drifts. Fluid approximation, waves in plasmas. Diffusion, plasma resistivity. Stability. Instabilities.
Course completion requirements -
Last update: doc. RNDr. Ladislav Šubr, Ph.D. (13.06.2019)

Credit is obtained after test exam during the class. Successfull pass of the exam for credit is required for the final exam which is oral.

Literature - Czech
Last update: T_AUUK (27.03.2015)

Chen F. F.: Uvod do fyziky plazmatu, Academia, Praha 1984 (úlohy jsou z této knihy)

T. Padmanabhan, Theoretical Astrophysics, Cambridge University Press,

Cambridge, 2002

Teaching methods - Czech
Last update: T_AUUK (31.03.2008)


Requirements to the exam - Czech
Last update: doc. Mgr. Michal Švanda, Ph.D. (06.10.2017)

Zkouška je ústní, zkoušený zodpoví dvě otázky volené z probíraných témat. Důraz je kladen na pochopení látky.

Požadavky zkoušky odpovídají sylabu předmětu v rozsahu, který byl prezentován na přednášce.

Syllabus -
Last update: T_AUUK (26.03.2015)

Basics of statistical physics. Lioville theorem, distribution function, Lioville equation, Boltzmann equation and its moments. Thermodynamical equilibrium. Maxwell-Boltzmann distribution, Saha equation.

Basic definitions of plasma physics. Definition of plasma, temperature, collective behavior, quasineutrality. Debye length. Criteria for plasma.

Motion of charged particles. Larmor frequency, Larmor radius, drift in homogeneous magnetic and electric fields, grad-B drift, curvature drift, inhomogeneous electric field. General solution for the motion of gyration centre for slowly changing magnetic and electric field. Drift currents. Magnetic mirrors. Magnetic moment, adiabatic invariants. Integrals of motion for the axially symmetric magnetic field, allowed and forbidden regions. Dipole, radiation belts.

Basics of magnetohydrodynamics. Maxwell equations for plasmas, fluid equations, collisions. Complete set of equations for two-fluid approximation. Diamagnetic drift, Boltzmann relation, validity

Základy magnetohydrodynamiky. Maxwellovy rovnice pro plazma, pohybové rovnice tekutiny, srážky,

úplná soustava rovnic pro dvoutekutinovou aproximaci. Diamagnetický drift, Boltzmannuv vztah, validity of MHD approximation, single-fluid approximation.

Waves in plasmas. Description of the waves, phase and group speed, plasma frequency, sound waves. Electrostatic electron and ion waves, electromagnetic electron and ion waves, MHD waves. Alfvén speed, mode conversion.

Diffusion and plasma resistivity. Mean free path, Fick law, ambipolar diffusion, diffussion in the planparallel walls configuration, diffusion across the magnetic field. Highly ionised plasmas, specific resistivity.

Stability of plasmas. MHD equilibrium, plasma beta, diffusion of the magnetic field into plasma. Classification of instabilities, two-stream instability, gravitation, and universal instability. Landau damping.