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

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

Jul 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011jgra..11607225t&link_type=abstract

Journal of Geophysical Research, Volume 116, Issue A7, CiteID A07225

Physics

1

Magnetospheric Physics: Magnetosphere: Inner, Magnetospheric Physics: Mhd Waves And Instabilities (2149, 6050, 7836), Magnetospheric Physics: Plasmasphere, Magnetospheric Physics: Substorms

Scientific paper

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$\perp$R), azimuthal (B$\perp$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 inside of the plasmapause estimated from an empirical formula while DE 1 was located at high 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.

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