Magnetospheric response of two types in PSc geomagnetic pulsations to interaction with interplanetary shock waves

  1. Baikal State University, Irkutsk, Russia
  2. Space Research Institute RAS, Moscow, Russia
  3. Polar Geophysical Institute RAS, Apatity, Russia
  4. Sodankylä Geophysics Observatory, Sodankylä, Finland
  5. Institute of Astronomy and Geophysics AS Mongolia, Ulaanbaatar, Mongolia
  6. Institute of Cosmophysical Research and Radio Wave Propagation FEB RAS, Paratunka, Kamchatka, Russia
  7. Institute of Solar-Terrestrial Physics SB RAS, Irkutsk, Russia

Using the June 22, 2015 event as an ex-ample, we present new data confirming the presence of a precursor of the sudden magnetic impulse caused by a powerful interplanetary shock wave (ISW). The precur-sor 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 induc-tion magnetometers at 18:33:27 UT. No significant phase delays of the signals were detected in four fre-quency bands at widely spaced observatories. It is sug-gested 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.

Solar-Terrestrial Physics. - 2018. – v.4, no.3. - P. 52–66; DOI - 10.12737/stp-43201808