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Near-equatorial great enhancements of the quasi-trapped >30 keV electrons atlow-altitudes are studied during strong geomagnetic storms. We have found thatthe transient phenomenon often began at the morning and was capable to liveseveral hours predominantly over the Pacific region with flux intensitieslargely exceeded quiet-time level by 4-5 orders of magnitudes. The purpose ofthe study is to validate an assumption that the enhanced quasi-trapped electronfluxes can be an important source of the ionization in the topside ionospherein the range between the low and middle latitudes and to estimate energydeposition. We show that ionizing particle effect can significantly contributein storm-time increase of total electron content (TEC) or positive ionosphericstorm. We present analysis of medium/great flux events during moderate/majorstorms on 22 July 2009 and 27 July 2004 as examples for demonstratingconcomitances of enhanced electron fluxes with ionospheric storm positivephases. Addition experimental support concerning the F2-region rise wasobtained from COSMIC/FS3 radio occultation data for the storm of 22 July 2009.

Evidence for Near-Equatorial Deposition by Energetic Electrons in the Ionospheric F-layer