AUDIO- AND SUBAUDIO-FREQUENCY ELECTROMAGNETIC RADIATION AT HIGH LATITUDE
KIRUNA GEOPHYSICAL OBSERVATORY (SWEDEN)
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Fluctuations in the audio- and subaudio frequency range have been extensively studied. I-Band emissions at gyro frequencies of ionospheric ions and hiss frequencies as well as many emission bands, which are quite distinct from the normal back-ground-signals and are obtained as strong enhancements in portions of the spectrum, have been recorded. These latter observations, with special emphasis on the 700 cps emission band, are reported and discussed. All the emissions at 700 cps are probably caused by the same physical process or processes. It is considered probable that these emissions consist of electromagnetic radiation which is propagated in the extraordinary mode along the lines of force of the earths magnetic field. The hypothesis that the 700 cps signals are generated outside the E-layer, by the arrival of protons is discussed.
- Atmospheric Physics