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Pi2 pulsations in the inner magnetosphere simultaneously observed by the Active Magnetospheric Particle Tracer Explorers/Charge Composition Explorer and Dynamics Explorer 1 satellites

2011; American Geophysical Union; Volume: 116; Issue: A7 Linguagem: Inglês

10.1029/2010ja016199

2156-2202

M. Teramoto, Kazue Takahashi, M. Nosé, Dong‐Hun Lee, P. Sutcliffe,

Solar and Space Plasma Dynamics

[1] We statistically studied the spatial characteristics of Pi2 pulsations using magnetic field observations in the magnetosphere at the equatorial-orbiting Active Magnetospheric Particle Tracer Explorers (AMPTE)/Charge Composition Explorer (CCE) and the polar-orbiting Dynamics Explorer 1 (DE 1) satellites and on the ground at the low-latitude station Kakioka (KAK, L = 1.23). We defined Pi2 pulsations from wavelet analysis of KAK data covering August 1984 to January 1989 and obtained 849 nightside (20:00–04:00 LT) events. For each KAK Pi2 event, we evaluated the coherence between the ground H component and the magnetospheric radial (B⊥R), azimuthal (B⊥A), and compressional (B//) components at the frequency of the ground Pi2. High-coherence ground-satellite Pi2 events were found most often in B//, with many of them evident at both spacecraft when CCE was located near the equator (magnetic latitude 30°) and outside of the estimated plasmapause. In these simultaneous CCE and DE 1 events, the B// amplitude was larger at CCE; in addition, the H-B// cross phase was ∼0° at CCE but was ∼180° at DE 1. We show detailed analysis of one such event as well as two other events that occurred when CCE was outside of the estimated plasmapause and exhibited different coherence and cross-phase properties at this spacecraft. Overall, the two-satellite observations provide additional evidence of plasmaspheric virtual resonance, which was previously suggested from studies using single satellites.