The Effects of Relative Drift Velocities Between Proton and He2+ on the Magnetic Spectral Signatures in the Plasma Depletion Layer

(整期优先)网络出版时间:2011-05-15
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Magneticspectrumoftheelectromagneticioncyclotronwavesintheterrestrialplasmadepletionlayer(PDL)aresometimesobservedtohaveaBIF(bifurcated)signature,whereadiminutionaround0.5ΩpwithΩptheprotongyrofrequency,occursbetweentwoactivitypeaksinthespectrum.Byone-dimensionalhybridsimulations,theeffectofrelativedriftvelocitiesbetweenprotonsandHe2+onthemagneticspectralsignaturesinthePDLisstudied.Theresultsshowthattherelativedriftvelocityenhancesthedevelopmentofprotoncyclotronwavesanddeclinesthedevelopmentofheliumcyclotronwaves.Theprotoncyclotronwavesarefirstlyexcited,andfollowedbytheexcitationofheliumcyclotronwavesduetotheincreaseintherelativedriftvelocity.Moreover,theboundarybetweentwoactivitypeaksgetsobscure.