Abstract
MEASUREMENTS of the group height and sense of rotation of the polarization ellipse by Brunnschweiler1 in the swept frequency-range of 100–1,000 kc./s. have frequently displayed an interference pattern similar to those shown by the records of Fig. 1. This is an ordinary h′–f record to which has been added a sense of rotation indicator; corresponding to a dark trace, the echo polarization is a north into east rotation (N→E) while the light trace refers to the echo having a north into west rotation (N→W). Further details on the recorder design have been given by Carlson2.
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References
Brunnschweiler, A., and Carlson, H. N., Nature, 188, 217 (1960).
Carlson, H. N., Sci. Rep. No. 129, Ionosphere Res. Lab., Pennsylvania State Univ.
Ratcliffe, J. A., Magneto Ionic Theory (Cambridge Univ. Press).
Seddon, J. C., Tech. Note D-1043, Nat. Aeronautics and Space Admin., Washington, D.C.
Elling, W., Archiv Elektrischen Übertragung, 15, 115 (1961).
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FERRARO, A., TOU, C. Identification of Sporadic-E from Low-Frequency Sweep Polarization Records. Nature 193, 461–462 (1962). https://doi.org/10.1038/193461a0
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DOI: https://doi.org/10.1038/193461a0
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