Investigation of Plasmaspheric Plumes Measured by Cluster

Details Investigation of Plasmaspheric Plumes Measured by Cluster Investigation of Plasmaspheric Plumes Measured by Cluster

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa41b1723m&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SA41B-1723

Physics

[2752] Magnetospheric Physics / Mhd Waves And Instabilities, [2760] Magnetospheric Physics / Plasma Convection, [2768] Magnetospheric Physics / Plasmasphere, [2784] Magnetospheric Physics / Solar Wind/Magnetosphere Interactions

Scientific paper

Plasmaspheric plumes are frequently observed in the inner magnetosphere. When the geomagnetic activity increases, a part of the plasma inside the main body of the plasmasphere in the duskside is flowing out. The plasma is subsequently moving toward the polar cap or the magnetosheath. After the geomagnetic activity decreases, the plasmaspheric plume remains and starts to corotate with the Earth. Even though certain features on plasmaspheric plumes have been revealed, there are still questions on underlying physics about how the plume is generated and evolves. In order to investigate these questions, we would like to examine two topics on plasmaspheric plumes mainly using data measured by multi-instruments on the multi-spacecraft mission Cluster. The first topic is statistical characteristics of plumes. In addition to the previous analysis using number density, we add convection velocity into the database. The motion and flux of plumes are investigated in terms of their dependence on interplanetary and geomagnetic parameters. Hence we would like to estimate reasons for the variability of plumes. The second topic is small scale structures inside the plume. It has been reported that there are lots of fluctuations inside the plume. We would like to investigate some of these regarding their origin and mode. We are interested in how the large scale structures affect these small scale structures.

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