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Ion density enhancements at the topside low-latitude ionosphere duringa Bastille storm on 15–16 July 2000 and Halloween storms on 29–31 October2003 were studied using data from ROCSAT-1/IPEI experiment. Prominent iondensity enhancements demonstrate similar temporal dynamics both in thesunlit and in the nightside hemispheres. The ion density increasesdramatically (up to two orders of magnitude) during the main phase ofthe geomagnetic storms and reaches peak values at the storm maximum. The densityenhancements are mostly localized in the region of a South Atlantic Anomaly(SAA), which is characterized by very intense fluxes of energetic particles.The dynamics of near-Earth radiation was studied using SAMPEX/LEICA data on>0.6 MeV electrons and >0.8 MeV protons at around 600 km altitude.During the magnetic storms the energetic particle fluxes in the SAA regionand in its vicinity increase more than three orders of magnitude. Thelocation of increased fluxes overlaps well with the regions of ion densityenhancements. Two mechanisms were considered to be responsible for thegeneration of storm-time ion density enhancements: prompt penetration of theinterplanetary electric field and abundant ionization of the ionosphere byenhanced precipitation of energetic particles from the radiation belt

Storm-time ionization enhancements at the topside low-latitude ionosphere