THEMIS Pi2 observations near the dawn and dusk sectors in the inner magnetosphere

Details THEMIS Pi2 observations near the dawn and dusk sectors in the inner magnetosphere THEMIS Pi2 observations near the dawn and dusk sectors in the inner magnetosphere

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm11b1740k&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM11B-1740

Physics

Plasma Physics

[7868] Space Plasma Physics / Wave/Wave Interactions

Scientific paper

Pi2 pulsations observed in the inner magnetosphere have been explained as radially-trapped fast mode waves in the plasmasphere (i.e., plasmaspheric resonance). This model suggests that these waves can be globally detected at all local times in the inner magnetosphere when azimuthal propagation is allowed. However, there are no reports of Pi2-associated fast mode waves on the dayside in the inner magnetosphere. Thus, it is still questioned why a Pi2 pulsation excited at nightside does not propagate through the magnetosphere to dayside. In February 2008, THEMIS probes were near dawn and/or dusk sides, which are the transition regions between the nightside and dayside, and dayside in the inner magnetosphere (L < 4) when low-latitude Pi2s were identified at Bohyun (L = 1.35) station on the nightside. Using the THEMIS magnetic field and electric field data, we examined if Pi2s are excited by longitudinally localized disturbances. We found that the magnetic and electric field oscillations at THEMIS, associated with low-latitude Pi2s, are dominated by the poloidal components (Bx, Bz, and Ey). They show a radially-standing mode and have a high coherence (> 0.6) with BOH Pi2 oscillations when THEMIS was on the dawnside. However, the rate of occurrence of high-coherence events was very low on the duskside. This indicates that Pi2-associated poloidal oscillations are not well established on the duskside. Our observations are discussed with spatial plasmaspheric structure and possible Pi2 mechanisms.

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