Physics
Scientific paper
Feb 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86..681s&link_type=abstract
Journal of Geophysical Research, vol. 86, Feb. 1, 1981, p. 681-686. Research supported by the South African Council for Scienti
Physics
14
Diurnal Variations, Interplanetary Magnetic Fields, Ionospheric Disturbances, Ionospheric Drift, Ionospheric Electron Density, Discontinuity, Ionospheric Currents, Magnetoactivity, Nocturnal Variations
Scientific paper
Observations made with Scandinavian twin auroral radar experiment have revealed the existence of a discontinuity in the electron drift pattern at high latitudes during the morning hours. The morning discontinuity appears to be equivalent to the evening (or Harang) discontinuity but has the region of westward drifting electrons located poleward of the eastward drifting electrons. The dependence of the discontinuity occurrence times on the sign of the azimuthal component, By, of the interplanetary magnetic field has been investigated. It is found that the evening discontinuity generally occurs earlier for By less than 0 than for By greater than 0. A similar behavior was not found for the morning discontinuity, possibly due to the effects of the high level of magnetic activity (Kp equal to or greater than 5-) associated with observations of this discontinuity. The average time separation between evening and morning discontinuities was 12 h 30 min. It is tentatively proposed that the morning discontinuity is the footprint of the polar cleft in the ionosphere. This would imply that the cleft, during very disturbed magnetic conditions, can extend down to 65 deg geomagnetic latitude.
Nielsen Edward
Scourfield Malcolm J. W.
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