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|Title:||Latitudinal Patterns in Plasma Scale Heights & Ion Transition Altitudes in the Low Latitude Topside Ionosphere|
|Abstract:||Trans-equatorial passes of the Alouette-2 satellite covering ±60° dip are examined for latitude and altitude variations of electron density during typical solstice and equinox periods. Clear seasonal differences are seen between dip-conjugate locations in the two hemispheres up to an altitude of 1200 km, very pronounced in the solstices and milder in equinox. Above 1200 km, altitude profiles of Ne, from all latitudes within ± 40° merge into uniformity. Interpolated N-h data at closely spaced height intervals are used to compute scale heights, and hence to compute ion change-over altitudes at these low latitudes. The 0+ -He+ change-over altitude seems to occur at 600-800 km with higher values in the summer hemisphere. The He+ -H+ change-over shows more variability ranging between 1200 and 2000 km. Field-aligned values of electron density show a smooth variation with considerable symmetry about the equator even during solstices. These features are interpreted in terms of physical processes in the topside.|
|ISSN:||0975-105X (Online); 0367-8393 (Print)|
|Appears in Collections:||IJRSP Vol.10(4) [August 1981]|
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