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Tomographic investigations of temporal variations of the ionospheric electron density and the implied fluxes
Author(s) -
Kunitsyn V. E.,
Andreeva E. S.,
Franke S. J.,
Yeh K. C.
Publication year - 2003
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2003gl016908
Subject(s) - ionosphere , electron density , longitude , anomaly (physics) , geology , local time , flux (metallurgy) , atmospheric sciences , plasma , noon , geophysics , zonal and meridional , physics , geodesy , computational physics , latitude , statistics , mathematics , materials science , condensed matter physics , quantum mechanics , metallurgy
A new technique is introduced for determining plasma fluxes using tomographic images of ionospheric electron density. Pairs of images are used to estimate the time derivative of the F‐region electron density in the region of the northern equatorial anomaly at 120°E longitude. Characteristics of temporal variations are described, and two different methods are used to infer electron fluxes from the measured time derivaties. The height‐dependent latitudinally‐averaged vertical flux and a 2D “potential” flux are derived based on reasonable assumed boundary conditions. Examples illustrate that average vertical plasma fluxes in the local morning and evening hours are upward and downward, respectively, with peak magnitudes on the order of 10 9 cm −2 s −1 . The 2D plasma fluxes in a meridional cross‐section through the equatorial anomaly are calculated, and clearly illustrate the characteristic flow associated with the equatorial fountain effect.