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Il Nuovo Cimento (1955-1965)

, Volume 34, Issue 4, pp 987–1009 | Cite as

Conductivity of a warm plasma to an oscillating electric force in the presence of a strong magnetic field

Article

Summary

By assigning an equation of the Boltzmann type to each species of particles and treating these equations under the assumption that the field is spatially uniform, the electric conductivity of a warm plasma, composed of electrons, ions of one species, and neutral molecules of one species, in the presence of a stationary magnetic field is investigated. This treatment takes into account the collisions among particles. The electric force due to the collective displacements of charged particles is considered as distinguishable from the other part of the total electric force. The three resonant frequencies defined in this article are the natural frequencies of the system. The application of the results to radio waves and magneto-acoustic waves is suggested under various conditions. Due to the assumption of spatially uniform field in treating the conductivity, the application is valid only when the phase speed of a wave is higher than the average speed of thermal motions of particles.

Riassunto

Assegnando una equazione del tipo di Boltzmann a ciascuna specie di particelle e trattando queste equazioni nell’ipotesi che il campo sia spazialmente uniforme, si studia la conduttività elettrica di un plasma caldo, composto di elettroni, ioni di una sola specie e molecole neutre di una sola specie, in presenza di un campo magnetico stazionario. Questo trattamento tiene conto delle collisioni tra le particelle. Si suppone che la forza elettrica dovuta agli spostamenti collettivi di particelle cariche sia distinguibile dalle altre parti della forza elettrica totale. Le tre frequenze di risonanza definite in questo articolo sono le frequenze naturali del sistema. Si suggerisce l’applicazione dei risultati alle onde radio ed alle onde magneto-acustiche in varie condizioni. In conseguenza dell’ipotesi, fatta nel trattare la conduttività, che il campo sia spazialmente uniforme, l’applicazione è valida solo quando la velocità di fase di un’onda è maggiore della velocità media dei movimenti termici delle particelle.

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Copyright information

© Società Italiana di Fisica 1964

Authors and Affiliations

  • T. Koga
    • 1
  1. 1.Graduate CenterPolytechnic Institute of BrooklynFarmingdale

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