Abstract
Pulsation Irregular Type 2 (Pi2) oscillations are transients in the Earth's geomagnetic field of typically 100s, duration and precursors of geomagnetic substorms. Though the periods of the oscillations are consistent with magnetic field line resonance in the Earth's dipole field, the polarization characteristics are not. A new theory for Pi2 oscillations based upon the resonant interaction of waves originating from the two principle magnetic field structures of the Earth's magnetosphere, that is, a resonance between standing waves in the Earth's dipole field and normal mode oscillations of the geomagnetic tail is forwarded. The effect of this interaction yields a variation of polarization in longitude consistent with that observed.
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