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Impedance of a spherical probe immersed in a warm magnetized plasma
Author(s) -
Fujita Takao,
Adachi Saburo
Publication year - 1981
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1029/rs016i003p00399
Subject(s) - plasma , physics , debye length , atomic physics , radius , electron , electromagnetic electron wave , plasma oscillation , electron cyclotron resonance , resonance (particle physics) , radiation , electrical impedance , computational physics , optics , quantum mechanics , computer security , computer science
The rf impedance characteristics of a spherical probe, which is immersed in a warm magnetized plasma, are investigated theoretically. Both grid and solid sphere models are treated. The fluid model is used to describe the magnetized electron plasma. The impedance contains a resistance resulting from the radiation of electrostatic plasma waves. The resonance frequency for the warm magnetized plasma, at which the reactance vanishes, is different from the electron cyclotron frequency, at which the resonance occurs in a cold magnetized plasma; it depends on both the radius of the sphere and the Debye length. Several previous theories, which have been studied, are unified in the present theory. It is also found that the surface charge density on the sphere is exactly uniform in the cold magnetized plasma.