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Title: On the Cause of Day-to-day Variability in the F-region Electron Concentration
Authors: Jain, A R
Mahajan, K K
Issue Date: Jun-1979
Publisher: NISCAIR-CSIR, India
Abstract: The day-to-day variability in the electron concentration in the F-region is examined by analyzing the incoherent scatter data for St Santin (44.6°N; 2.2°E) for hours near midday (1000-1400 hrs LT) when quasi-steady- state conditions can be assumed, Large day-to-day variability, by as much as factor of 3, is noticed in the F-region and topside ionosphere. This variability is studied in relation to simultaneously measured values of ion drift velocities. No definitive correlation is seen between electron concentration changes and ion drift variations, except for winter months, where large downward velocities are correlated with low electron concentration, and -low downward velocities are correlated with high electron concentration. A large variability in electron concentration in the chemical equilibrium region (i.e. below about 200 km) is also observed. Although there is no one-to-one correlation between the electrons concentrations in the chemical equilibrium region with those in the F-region, yet large electron concentration values in the chemical equilibrium region are accompanied by large F-region values and vice versa. The electron concentration changes in the chemical equilibrium region indicate the possibility of neutral composition changes near the turbo pause level.
Page(s): 119-221
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.08(3) [June 1979]

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