employee from 01.01.1975 to 01.01.2021
Irkutsk, Irkutsk region, Russian Federation
Moskva, Moscow, Russian Federation
Apatity, Russian Federation
Sodankyulya, Finland
Ulaanbaatar, Mongolia
Paratunka, Kamchatka, Russian Federation
Irkutsk, Russian Federation
Irkutsk, Russian Federation
Apatity, Russian Federation
Using the June 22, 2015 event as an example, we present new data confirming the presence of a precursor of the sudden magnetic impulse caused by a powerful interplanetary shock wave (ISW). The precursor in the form of a train of oscillations (broadband pulse) with a falling frequency in the range 0.25÷11 Hz with a duration of ~20 s, which had a spectral resonance structure, was recorded globally by a network of induction magnetometers at 18:33:27 UT. No significant phase delays of the signals were detected in four frequency bands at widely spaced observatories. It is suggested that the impulse can be excited in the Earth – ionosphere waveguide by a pulsed electric field which occurs in the ionosphere due to the short-term impact of ISW on the magnetosphere.
sudden magnetic impulse, global precursor, broadband burst of geomagnetic pulsations, spectral resonance structure, Earth – ionosphere resonator, ionospheric Alfvén resonator
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