Geophysical Journal | 2012 volume 34 5

Earthquake effects in the behavior of ULF electromagnetic emissions

© B.V. Dovbnya, A.S. Potapov, R.A. Rakhmatulin

Anomalous changes in the behavior of Pc1 geomagnetic pulsations and oscillations with the spectrum resonance structure (SRS) occurred a few minutes before or after an earthquake have been found. In all cases the changes happened following the ULF electromagnetic pulse and were observed either as a sudden stop of oscillations, or as their sharp intensification. SRS reflects the ionosphere resonance properties that can be sharply modified due to impact of an earthquake on the ionosphere layers. Changes in the resonance properties can be a reason of the effects in Pc1 s as well. It is supposed that the effects in two types of emissions (Pc1 and SRS oscillations) are the consequence of the complex processes in the upper atmosphere, including precipitation of the charged particles into the ionosphere caused by interaction of ULF electromagnetic pulse of lithosphere origin with radiation belt.

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