Letter | Published:

Identification of Sporadic-E from Low-Frequency Sweep Polarization Records

Naturevolume 193pages461462 (1962) | Download Citation



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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  1. 1

    Brunnschweiler, A., and Carlson, H. N., Nature, 188, 217 (1960).

  2. 2

    Carlson, H. N., Sci. Rep. No. 129, Ionosphere Res. Lab., Pennsylvania State Univ.

  3. 3

    Ratcliffe, J. A., Magneto Ionic Theory (Cambridge Univ. Press).

  4. 4

    Seddon, J. C., Tech. Note D-1043, Nat. Aeronautics and Space Admin., Washington, D.C.

  5. 5

    Elling, W., Archiv Elektrischen Übertragung, 15, 115 (1961).

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  1. Ionosphere Research Laboratory, Pennsylvania State University, University Park, Pennsylvania

    • A. J. FERRARO
    •  & C. P. TOU


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