Mechanism of association between Pi2 pulsation and magnetospheric substorm

Physics

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Geomagnetic Pulsations, Magnetic Effects, Magnetic Storms, Magnetospheric Instability, Auroral Electrojets, Magnetic Signatures, Magnetic Variations, Plasmapause, Power Spectra, Propagation Modes

Scientific paper

Based on the analysis of the data obtained at the ground and by satellites, the following morphological characteristics of Pi2 are revealed: (1) Pi2 shows a peak amplitude at the auroral oval and a secondary maximum inside the plasmapause latitude, (2) a phase reversal of the NS-component of Pi2 exhibits both at the auroral oval and near the plasmapause latitude, (3) Pi2 occurs associated with a release of the magnetic energy in the magnetotail lobe, (4) Pi2 propagates in a compressional mode in the magnetosphere and is detected as a torsional mode on the ground. Our result obtained above leads us to a Pi2 model that the substorm-associated compressional mode of HM waves excited in the magnetotail is converted to the torsional mode of HM waves propagating along the field-line anchoring at the northern and southern auroral ovals and is observed as magnetic pulsation Pi2 on the dark hemisphere of the earth.

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