Physics – Plasma Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm41a1850z&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SM41A-1850
Physics
Plasma Physics
[2744] Magnetospheric Physics / Magnetotail, [2748] Magnetospheric Physics / Magnetotail Boundary Layers, [7839] Space Plasma Physics / Nonlinear Phenomena, [7846] Space Plasma Physics / Plasma Energization
Scientific paper
Super-Alfvén convective flows are occasionally observed in the Earth’s magnetotail. Solitary structures have been observed embedded in these flows [Park et al., 2007]. In this study we examine the interaction between super-Alfvén flow and a dipolarized magnetic field in the near earth magnetotail around X=-17 RE observed by Cluster-II. In this event there was a structure within the super-Alfvén flow at the trailing edge of a dipolarization. The structure featured a sharp decrease in the magnetic field which was accompanied by a density increase and a strong electric field. The structure was observed for about 10 seconds, indicating a scale size of about 4 local ion inertial lengths. The structure was not frozen-in with plasma flow and moved with a velocity larger than the Alfvén speed in the plasma rest frame. Energetic electron flux started to increase before the arrival of super-Alfvén flow, and the magnitude of flux reached maximum when the magnetic field became strongest. Perpendicularly electron heating was accompanied by whistler waves, ion acoustic waves and lower hybrid waves. Interestingly, the pulse appeared to be in a dynamo region, i.e. J.E<0. The observation of electron heating in a dynamo region suggests that energy was transferred from ions to electrons in the super-Alfvén flow.
Deng Xinghua
Huang Shizhen
Pang Yi
Zhou Miao
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