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We report simultaneous observations of intense fluxes of quasi-trappedenergetic electrons and substantial enhancements of ionospheric electronconcentration (EC) at low and middle latitudes over Pacific region duringgeomagnetic storm on 15 December 2006. Electrons with energy of tens of keVwere measured at altitude of ~800 to 900 km by POES and DMSP satellites.Experimental data from COSMIC/FS3 satellites and global network of ground-basedGPS receivers were used to determine height profiles of EC and vertical totalEC, respectively. A good spatial and temporal correlation between the electronfluxes and EC enhancements was found. This fact allows us to suggest that thequasi-trapped energetic electrons can be an important source of ionosphericionization at middle latitudes during magnetic storms.

On relation between mid-latitude ionospheric ionization and quasi-trapped energetic electrons during 15 December 2006 magnetic storm