Abstract
A DIRECT measurement of the magnetic field strengths within the Galaxy would be of the greatest importance for understanding its structure and evolution1, and Clark2 has proposed a method based on the effect of a magnetic field on the anomalous dispersion of 21 cm radiation passing through neutral hydrogen. I wish to point out that Clark's calculation contains a fundamental error, rendering the method much less effective than he claims.
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References
Woltjer, L., in Stars and Stellar Systems, 5, Galactic Structure (edit. by Blaauw, A., and Schmidt, M.), chap. 23 (University of Chicago Press, Chicago, 1965).
Clark, B. G., Nature, 197, 474 (1963).
Bohr, N., Peierls, R., and Placzek, G., Nature, 144, 200 (1939).
Kramers, H. A., Estratto dagli Atti de Congresso Internazionale de Fisici Como (Bologna, 1927).
Kronig, R. de L., J. Opt. Soc. Amer., 12, 547 (1926).
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WAGONER, R. Critique of the “Clark Effect”. Nature 215, 943–944 (1967). https://doi.org/10.1038/215943a0
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DOI: https://doi.org/10.1038/215943a0
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