Ionospheric trough: Difference between revisions
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<div class="definition"><div class="short_definition">A portion of the [[F-region]], centered on the [[magnetic dip]] equator, in which [[electron]] densities are anomalously low with peaks at 15& | <div class="definition"><div class="short_definition">A portion of the [[F-region]], centered on the [[magnetic dip]] equator, in which [[electron]] densities are anomalously low with peaks at 15°–20° latitude on both sides.</div><br/> <div class="paragraph">The [[equatorial trough]] appears during daytime and is absent at night. It is attributed to [[diffusion]] of ionospheric [[plasma]] down the [[magnetic field]] lines from the [[magnetic equator]] as the F-region rises in response to an eastward [[electric field]] generated by dynamo action in the lower [[ionosphere]]. One or more troughs in [[electron density]] are also found at high latitudes and are magnetically linked to the [[plasmapause]] located at a radial distance of several earth radii in the outer [[magnetosphere]].</div><br/> </div> | ||
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Latest revision as of 14:30, 20 February 2012
ionospheric trough
A portion of the F-region, centered on the magnetic dip equator, in which electron densities are anomalously low with peaks at 15°–20° latitude on both sides.
The equatorial trough appears during daytime and is absent at night. It is attributed to diffusion of ionospheric plasma down the magnetic field lines from the magnetic equator as the F-region rises in response to an eastward electric field generated by dynamo action in the lower ionosphere. One or more troughs in electron density are also found at high latitudes and are magnetically linked to the plasmapause located at a radial distance of several earth radii in the outer magnetosphere.
