Influence of solar X-ray flares on the earth-ionosphere waveguide

SUMMARY: A simultaneous analysis of solar are X-ray irradiance and VLF signal amplitude on the GQD/22.1 kHz trace was carried out. Solar are data were taken from GOES 12 satellite listings. The VLF amplitude data were recorded by means of the AbsPAL (Absolute Phase and Amplitude Logger) at the Institute of Physics, Belgrade, Serbia. It was found that solar are events from class C to class X aect the VLF signal amplitude in various ways and can be classied according to the type of eect produced in the Earth-ionosphere waveguide on the VLF propagation.