The authors have observed experimentally that during electron cyclotron heating the electron longitudinal temperature drops as the perpendicular temperature increases. An RF source of 2.45 GHz and 1.0 kW was used. When an additional RF source (lower hybrid wave) of 30 MHz and 0.35 kW was introduced, it heated the plasma via the lower hybrid resonance at r=5.0 cm without, however, destroying the anisotropy in the temperature. The experiment was carried out in a linear mirror machine with a low-density ( approximately 1010cm-3) weakly-ionized (<1.0) plasma.
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