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机译:First Observations of Recurring HF-Enhanced Topside Ion Line Spectra Near the Fourth Gyroharmonic
Arctic Univ Norway UiT;
Northern Res Inst;
Swedish Inst Space PhysEISCAT Sci AssocUniv Leicester;
topside ion line spectra; HF enhancements; STIMULATED ELECTROMAGNETIC EMISSIONS; HIGH-LATITUDE IONOSPHERE; ASPECT ANGLE DEPENDENCE; OPTICAL-EMISSIONS; PLASMA; STRIATIONS; EISCAT; WAVE; FREQUENCIES; INSTABILITIES;