Comparison of the very low frequency signal amplitude in the ISIO and the French station for the same solar events

الملخص EN

There are heterogeneity and increase in the percentage of ionization with solar explosions, where the so-called sudden ion disturbance (SID), Which can be measured by the so-called very low frequencies (VLF), where used in this study to calculate the extent change of the signals amplitude between the receiver built in our station (ISIO) and the transmitters from different regions of the world comparing that with another receiver 4000 kilometers north, when location at southern France (A11٣), which receives the signals from the same transmitters, which we received the same signals and the timing of each solar event.

Five events received by our station from the period (2017-6-3) to the period (2017-9-10).

These events are compared with a set of events that recorded at different periods .The results showed that the signals amplitude in all events is much higher than the signal amplitude received from the French station.

This variation in amplitude is due to the heterogeneity of the receiving location at our station, which also means that the ionosphere at the top of this region, which is considered to be part of the subtropical regions, is different from those near the polar gap.