Author/Authors :
T.L. Zhang، نويسنده , , H. Zhao، نويسنده , , G. Le، نويسنده , , C.T Russell، نويسنده , , K. Schwingenschuh، نويسنده , , W. Magnes، نويسنده , , W. Riedler، نويسنده , , G.C Zhou، نويسنده , , D.J. Wang، نويسنده , , Z.X. Liu، نويسنده , , Y.F. Gao، نويسنده , , Nicole K.Y. Tang، نويسنده , , K. Yumoto، نويسنده ,
Abstract :
On June 14, 1998, a Pi 2 pulsation of unusually large amplitude was observed simultaneously by ground stations located in both of dayside and nightside local time sectors and with 145-degree latitude span (from 70.6°N to 74.7° S). The geomagnetic field observed by stations in nightside clearly showed substrom signatures at the event time and it appeared that the dayside Pi 2 signature is also associated with the substorm. We analyzed the polarization of the dayside Pi 2 wave in the horizontal plane and found that the longitudinal variation of the polarization agreed with that generated by a current wedge. This has previously been reported for nighttime Pi 2 but is unexpected for daytime events.
