Polarization characteristics of Pi2 oscillations

Details Polarization characteristics of Pi2 oscillations Polarization characteristics of Pi2 oscillations

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986p%26ss...34.1259h&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 34, Dec. 1986, p. 1259-1261.

Physics

4

Geomagnetic Micropulsations, Geomagnetism, Polarization Characteristics, Geomagnetic Tail, Magnetohydrodynamic Waves, Neutral Sheets, Resonance, Wave Interaction

Scientific paper

Pulsation Irregular Type 2 (Pi2) oscillations are transients in the earth's geomagnetic field of typically 100 s, 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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