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By Hideo Kodama

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Sci. : An assessment of the conditions for critical velocity ionization at the weakly ionized planets. Y. ): Magnetotail Physics. : Intense Charged Particle Beams. : Masers in the nuclei of galaxies. : Oliver Heaviside: Sage in Solitude. : Collected papers on the artificial radiation belt from the July 9, 1962, nuclear detonation. J. Geophys. Res. : A high-power reflex triode microwave source. IEEE Trans. Plasma Sci. : Experiment cold: the first deep sky survey with the Ratan-600 radio telescope.

The center of the Galaxy has milligauss magnetic field strengths stretching 60 pc in length. Similar strengths are inferred from polarization measurements of radiation recorded for double radio galaxies. No rotating object in the universe, that is devoid of a magnetic field, is known. In cosmic problems involving planetary, interplanetary, interstellar, galactic, and extragalactic phenomena, is usually of the order 1015–1020 (Fig. 16). In planetary ionospheres falls below unity in the E layer. Neglecting lightning, planetary atmospheres and hydrospheres are the only domains in the universe where a nonhydromagnetic treatment of fluid dynamic problems is justified.

5 mJy/pixel. 3 Regions of Applicability of Plasma Physics 19 is still largely ionized. The “neutral” hydrogen (HI) regions around galaxies are also plasmas, although the degree of ionization is only 10−4. Most of our knowledge about electromagnetic waves in plasmas derives from laboratory plasma experiments where the gases used have a low degree of ionization, 10−2–10−6 . Because electromagnetic fields play such an important role in the electrodynamics of plasmas, and because the dynamics of plasmas are often the sources of electromagnetic fields, it is desirable to determine where within the universe a plasma approach is necessary.

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