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Measurements of electron temperatures in the direction parallel and perpendicular to the magnetic field are made in a plasma produced by ECR (electron cyclotron resonance) in order to investigate the temperature anisotropy. It is found that the temperature perpendicular to the field is higher than the temperature parallel to the magnetic field by 3%-30% depending on the experimental condition. Dependence of anisotropy on the gas pressure, the resonance field configuration and the microwave power is studied. Discussion is made on the mechanisms causing the anisotropy and the energy relaxation.
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Amemiya et al. (1987) studied this question.
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