Physics
Scientific paper
Apr 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jatp...46..373n&link_type=abstract
Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 46, April 1984, p. 373-381.
Physics
63
Electric Fields, Ionic Mobility, Sporadic E Layer, Wind Direction, Convergence, Midlatitude Atmosphere, Northern Hemisphere, Velocity Distribution, Wind Shear
Scientific paper
The effect of an electric field and a homogeneous neutral wind on the vertical ion motion in the ionospheric E-region is investigated. An electric field pointing, in the Northern Hemisphere, in the quadrant between geomagnetic north and west is found to be capable of driving plasma towards a certain height from both above and below. A homogeneous neutral wind blowing in a direction between east and north has a similar effect. Unlike in the wind shear model, the resulting plasma sheet may be created within a quite limited height interval only. It seems possible that the midnight occurrence maximum of mid-latitude type Es-layers, observed at high latitudes, is caused by electric fields in the Harang discontinuity region. It is also suggested that the flat type Es-layers often observed before a substorm onset are caused by electric fields. The wind shear theory is investigated using a screw-like neutral wind profile.
Jalonen L.
Nygrén T.
Oksman J.
Turunen Tauno
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