On the theory of the sudden enhancement of atmospherics (SEA)

Physics

Scientific paper

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Scientific paper

The main purpose of the paper is to bring into a quantitative stage the different causes which give rise or influence the change of the integral field strength of atmospherics during a solar flare in the v.l.f. region: an increase of field strength at frequencies greater than about 15 kc/s and a decrease below 15 kc/s. In the first part of the paper the influence of the detector of a narrow band-pass receiver on the integrated field strength is examined. A relation is deduced between the input number of atmospherics and the rectified output voltage of the receiver. In the second part the input number N of atmospherics exceeding the threshold field strength of the receiver is calculated. The influence of the propagation function, of the statistical mean of the spectral amplitudes of the discharges and the influence of the geographical distribution of the discharges on the number N is discussed. The change of N during a solar flare caused by the decrease of height of the ionospheric wave guide is calculated. It gives qualitative agreement with the measured results. The importance of the threshold of the receiver on the magnitude of the SEA is shown.

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