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Multipoint observations of Pi2 pulsations and correlation with dynamic processes in the near-Earth magnetotail on March 18,2009

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Science China Earth Sciences 2014年第2期57卷 359-371页

作者： LUO Hao CHEN GengXiong DU AiMin Institute of Geology and Geophysics Chinese Academy of Sciences

Simultaneous measurements from THEMIS spacecraft, GOES11 and ground stations （Canadian Array for Realtime Investiga tions of Magnetic Activity or CARISMA, and 210 magnetic meridian or MM） on March 18, 2009 allow the study of dynamic processes in the nearEarth magnetotail and corresponding Pi2 pulsations on the ground in great detail. Fast earthward flows along with traveling Alfv6n waves and fast mode waves in the Pi2 band were observed by three Time History of Events and Macroscale Interactions during Substorms （THEM/S） probes （P3, P4 and P5） in the nearEarth plasmasbeet. At the mid to highlatitude nightside, the CARISMA stations located near the foot points of the three probes recorded Pi2s with two periods, about 80 s after the earthward fast flows observed by the P4 probe. The longperiod Pi2 （140-150 s） belongs to the transient response Pi2 （TR Pi2）, since the travel time of the Alfv6n waves between the plasma sheet and CARISMA stations is very close to half the period of the longperiod Pi2. The shortperiod Pi2 （60-80 s） has the same period band as the perpendicular velocity of the fast flows, which indicates that it may relate to the inertial current caused by periodic braking of the earthward fast flows. The 210 MM stations located at the lowlatitude duskside also observed Pi2s with the same start time, waveform and frequency, about 120 s after the earthward fast flows. Strong poloidal oscillations are shown by GOES11 （23 MLT） and the compressional component （Bb） is highly correlated with H components of the 210 MM stations, whereas the other two components （Br and Be） are not. These results confirm that the lowlatitude Pi2s are generated by cavity mode resonance, which is driven by an impulsive broadband source in the nearEarth magnetotail.

关键词： Pi2 pulsations earthward fast flows Alfvn waves cavity mode resonance

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Multipoint observations of Pi2 pulsations and correlation with dynamic processes in the near-Earth magnetotail on March 18,2009

Multipoint observations of Pi2 pulsations and correlation wi...

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中国科学院地质与地球物理研究所2014年度（第14届）学术年会

作者： LUO Hao CHEN GengXiong DU AiMin Institute of Geology and Geophysics Chinese Academy of Sciences

Simultaneous measurements from THEMIS spacecraft,GOES-11 and ground stations(Canadian Array for Realtime Investigations of Magnetic Activity or CARISMA,and 210° magnetic meridian or MM) on March 18,2009 allow the study of dynamic processes in the near-Earth magnetotail and corresponding Pi2 pulsations on the ground in great *** earthward flows along with traveling Alfven waves and fast mode waves in the Pi2 band were observed by three Time History of Events and Macroscale Interactions during Substrains(THEMIS) probes(P3,P4 and P5) in the near-Earth *** the mid- to high-latitude nightside,the CARISMA stations located near the foot points of the three probes recorded Pi2 s with two periods,about 80 s after the earthward fast flows observed by the P4 *** long-period Pi2(140-150 s) belongs to the transient response Pi2(TR Pi2),since the travel time of the Alfven waves between the plasma sheet and CARISMA stations is very close to half the period of the long-period *** short-period Pi2(60-80 s) has the same period band as the perpendicular velocity of the fast flows,which indicates that it may relate to the inertial current caused by periodic braking of the earthward fast *** 210° MM stations located at the low-latitude duskside also observed Pi2 s with the same start time,waveform and frequency,about20 s after the earthward fast *** poloidal oscillations are shown by GOES-11(3 MLT)and the compressional component(Bb) is highly correlated with H components of the 210° MM stations,whereas the other two components(Br and Be) are *** results confirm that the low-latitude Pi2 s are generated by cavity mode resonance,which is driven by an impulsive broadband source in the near-Earth magnetotail.

关键词： Pi2 pulsations earthward fast flows Alfven waves cavity mode resonance

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