Local night, impulsive (Pi2-type) hydromagnetic wave polarization at low latitudes

Details Local night, impulsive (Pi2-type) hydromagnetic wave polarization at low latitudes Local night, impulsive (Pi2-type) hydromagnetic wave polarization at low latitudes

Feb 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984p%26ss...32..135l&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 32, Feb. 1984, p. 135-142.

Physics

16

Geomagnetic Micropulsations, Magnetohydrodynamic Waves, Night Sky, Polar Substorms, Polarization (Waves), Earth Magnetosphere, Geomagnetism, Magnetic Variations

Scientific paper

The polarizations of local night impulsive (Pi2-type) hydromagnetic waves measured on the ground during a field campaign using three magnetometer stations spaced in latitude near L 1.9 have been examined. It is found that, contrary to results at these latitudes for more continuous waves on the dayside, the sense of rotation and phases of the waves do not change over the array for a given event. It is also found, statistically, that the ellipse orientations in the horizontal plane change from the first quadrant (Northeast/Southwest direction) for pre-local midnight events, to the second quadrant (Northwest/Southeast direction) for post-local midnight events. The wave ellipticities are found to be left-handed, independent of local time. These latter two results cannot be reconciled quantitatively in terms of hydromagnetic wave resonance theory for low latitude Pi2 events, where the plasmapause acts like a resonance region for one of the high latitude Pi2 source frequencies. The results are qualitatively in agreement with expectations from the substorm electrojet current wedge concept.

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