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Fine resolution series from three equatorialionosondes of the IEEY network in West Africa have revealed small-scale daytimepeak F2 structures, superposed on the slowly varying minimum or"trough" distribution in the ±5° magnetic latitude zone. We reportthis new morphology, concentrating on foF2 enhancements of two types:near-equatorial crests (which travel either northwards or southwards) andmagnetic field-aligned domes, whose onsets last only tens of minutes. Both typesare observed to start at mid-morning or early afternoon hours. We relate theiroccurrence with the available variations of Vz=E × Bupward drift which feeds the equatorial plasma fountain. We suggest the foF2enhancements to be triggered by brief slow-downs of the Vz velocity nearF2 peak altitude in our West African sector. Their short latitude extentdifferentiates them from the larger-scale tropical crest system. Furtheranalysis of these features should lead to weather-like models of the lowlatitude ionosphere variations, where unstable local coupling between processesseems to be the trigger. Key words. Ionosphere (Equatorial ionosphere ·Ionosphere-atmosphere interaction · Plasma temperature and density)</p

Non-trough &lt;i&gt;fo&lt;/i&gt;F2 enhancements at near-equatorial dip latitudes

Non-trough <i>fo</i>F2 enhancements at near-equatorial dip latitudes