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The role of various ionization sources in the A3 lf radio-wave absorption in middle latitudes

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Summary

The 272 kHz ionospheric absorption has been measured at the Průhonice Observatory by the A3 method (oblique incidence) for a long period. The results of the comparison of these absorption data with indices of solar, geomagnetic and cosmic ray activity are presented for large solar zenith angles. The day-time absorption (x ≈ 75° – 85°) is described well by these indices and appears to be affected particularly by direct solar Lyman-α radiation. The night-time absorption (x>100°), however, is not described sufficiently by the indices used.

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Authors and Affiliations

  1. Geophysical Institute, Czechosl. Acad. Sci, Prague

    Jan Laštovička

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  1. Jan Laštovička
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Laštovička, J. The role of various ionization sources in the A3 lf radio-wave absorption in middle latitudes. Stud Geophys Geod 21, 403–410 (1977). https://doi.org/10.1007/BF01613275

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