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We analyzed observation data collected by the Instrument for the Detection ofParticles (IDP) on board of DEMETER satellite during the period of totalseventeen months in 2007 and 2008. In the meantime, the VLF transmitter locatedat NWC ground station was shutdown for seven months and working for total tenmonths. Our analysis, for the first time, revealed in details the transientproperties of the space electrons induced by the man-made VLF wave emitted bythe transmitter at NWC. First, we mapped the electron flux distribution andfigured out the special range what the NWC belt covered. Then we investigatedthe NWC electron spectrograms in a wide range of McIlwain parameter (up toL=3.0). Finally, we obtained the averaged energy spectrum of the NWC electronswithin the drift loss-cone, and compared the difference during the observationsbetween daytime and nighttime. Our results proved the fact that the VLFemissions from NWC transmitter created momentary electron enhancement withfluxes up to 3 orders of magnitude. These electrons are distributed in theregion of 180 degree in longitude and 1.6 ~ 1.9 of L shell. In addition, theVLF emission induced either enhancement or loss of electrons in higher magneticshells up to L=3, and the maximum loss was up to 60% of the original value. Theenergy spectra of these electrons revealed that the enhancement during the NWCdaytime are more attenuated than those in the NWC nighttime, and that the shapeand the cutoff energy of the spectra are also quite different. We will presentthe results of our analysis, compare it with previous studies, and discuss theagreement of our results with the theory of wave-particle interaction.

Study of the NWC electrons belt observed on DEMETER Satellite