Two-satellite observations of Pi2 pulsations in the inner magnetosphere

Details Two-satellite observations of Pi2 pulsations in the inner magnetosphere Two-satellite observations of Pi2 pulsations in the inner magnetosphere

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm13a1794t&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM13A-1794

Physics

[2730] Magnetospheric Physics / Magnetosphere: Inner, [2752] Magnetospheric Physics / Mhd Waves And Instabilities, [2768] Magnetospheric Physics / Plasmasphere, [2790] Magnetospheric Physics / Substorms

Scientific paper

Many previous studies reported the properties of magnetic pulsations in the inner magnetosphere that are associated with low-latitude Pi2 pulsations. However, few examined the latitudinal and longitudinal structures of Pi2 pulsations in the inner magnetosphere. We statistically investigated the spatial characteristics of Pi2 pulsations based on simultaneous observations by the equatorial-orbiting Active Magnetospheric Particle Tracer Explorers/Change Composition Explorer (AMPTE/CCE) satellite, the polar-orbiting Dynamics Explorer (DE)-1 satellite, and at the low-latitude ground station Kakioka (KAK, L = 1.23). We identified Pi2 pulsations by applying wavelet analysis to KAK data covering August 1984 to January 1989 and obtained 849 nightside (20-04 LT) events. For each KAK event we computed the coherence between the ground H component and the magnetospheric radial (B⊥R), azimuthal (B⊥A), and compressional (B//) components and identified to identify “high-coherence” Pi2 events (coherence > 0.7). Our findings include the following: (1) the B// component dominates the high-coherence magnetic pulsation at both spacecraft; (2) high-coherence B// events at CCE were observed mostly on the nigthside, near the equator (magnetic latitude < 30° ), and earthward of the plasmapause estimated from an empirical formula, while high-coherence B// events at DE-1 were observed at high latitude (> 30°) and outside the estimated plasmapause; (3) the amplitude of the high-coherence B// oscillations was larger at CCE than at DE-1; (4) the H-B// cross phase was ~ 0° at CCE while it was ~ 180° at DE-1; (5) the azimuthal wave number was smaller than 1. These results support the plasmaspheric virtual resonance (PVR) mode as the source of low-latitude Pi2 pulsations, which was suggested from previous single-satellite studies.

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