Conjugate Relationships of Magnetic Pi2 Pulsations in the Auroral Region
Kuwashima, M.
Abstract
Conjugate relationships of magnetic Pi 2 pulsations have been studied based on the data obtained at Syowa Stations in Antarcica and around Reykjavik in Iceland, which are the best conjugate-pair among the many stations in the auroral region. The Pi 2 waves are observed simultaneously at the conjugate-pair with a high coherency. The phase relationships of Pi 2 waves show an in-phase oscillation in the north-south(H) component, while show an antiphase oscillation in the east-west (D) component. Those observational results strongly suggest that Pi 2 is caused by the odd-mode (fundamental-mode) magnetohydrodynamic (MHD) standing oscillations of the field lines which are anchored at the auroral ovals.
