Plasma transport process in the equatorial/low-latitude ionosphere

Abstract
<p>The behaviour of the equatorial/low-latitude ionosphere and the transport processes during magnetic disturbed and quiet periods of a high solar activity year, 2014, in the American sector are investigated. Parameters used include vertical drift <em>(Vz)</em>, transport term (<em>W</em>), NmF2, hmF2 and scale-height (<em>H</em>). The F2 plasma variations followed the diurnal local solar pattern, being higher at daytime. The sunset maximum and sunrise minimum peaks of <em>hmF2</em> were directly opposite to the scale height (<em>H</em>) pattern. The plasma distribution was basically controlled by combined actions of the electrodynamic convection/thermospheric composition, which is geomagnetic activity dependent. The annual, semi-annual and winter-anomalies of the F2 parameters were higher at the dip equator in comparison with the low-latitude. The Vz pre-reversal peak magnitude coincided with <em>hmF2</em> peak and the effects are more pronounced during geomagnetic disturbed conditions. The transport term pattern was similar to that of the scale height and it is suggested as a proxy parameter for quantifying low-latitude plasma irregularities and distribution of thermospheric composition.</p>
Year of Publication
2019
Journal
Advances in Space Research
Volume
63
Number of Pages
1619-1633
Date Published
03/2019
ISSN Number
02731177
URL
https://linkinghub.elsevier.com/retrieve/pii/S0273117718308676
DOI
10.1016/j.asr.2018.11.013