Physics
Scientific paper
Aug 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jatp...42..743t&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 42, Aug. 1980, p. 743-752.
Physics
15
Atmospheric Scattering, Equatorial Atmosphere, Geomagnetism, Magnetic Fields, Bubbles, Electron Density Profiles, F Region, Night, Two Dimensional Models
Scientific paper
Measurements of both incoherent-scatter (IS) and backscatter from field-aligned irregularities (FAI) were made in 1978 with ALTAIR, a fully-steerable high-power radar, to investigate the magnetic-field-aligned characteristics of equatorial plasma bubbles. By operating the radar in a latitude-scan IS mode, it was possible to map the location and percentage depletion of plasma bubbles as a function of altitude and latitude. By showing that backscatter from FAI is spatially collocated with the upper wall of plasma bubbles, it is possible to use the spatial displacement of a field aligned backscatter region to estimate the upward bubble velocity. Besides showing that plasma bubbles are indeed aligned along magnetic field lines, the data set is used to show that a plasma bubble with a percentage depletion of as much as 90% does not have as large an upward velocity as predicted by two-dimensional models. Instead, the inferred bubble velocity is shown to be in better agreement with the bubble velocity predicted by theoretical models using flux-tube-integrated values of electron density and Pedersen conductivity. The need to use flux-tube-integrated values when comparing theory and observation is further stressed by the presence of a non-uniform latitudinal distribution of electron density (i.e. the equatorial anomaly) that was found in the latitude-scan data.
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