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The axial profile of the axial component of the wave magnetic field has been measured for m = 0 helicon waves. A dip in is observed at cm from the antenna, and is explained as a result of the beat between the fundamental and the second-order radial modes of the m = 0 helicon wave. The measured imaginary part of , which consists only of the wave field, is compared with that of the calculated wave field using the theory of the uniform plasma case. It is found that % of the amplitude arises from the second-order mode and the axial damping length of the fundamental mode .
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Sakawa et al. (1997) studied this question.
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