抄録
Magnetometers carried by spacecraft in synchronous orbit show that the magnetic field is almost continuously agitated by the presence of hydromagnetic waves. A variety of waves have been identified, several of which are always associated with certain phases of magnetospheric substorms. These types include Pi 2 bursts and Pi pulsations near midnight and IPDP and mixed mode Pc4-5 waves near dusk. In this report we describe the characteristics of these waves and discuss possible directions for further work.
