Observations of Electron Vorticity in the Inner Plasmasheet and its Relationship to Reconnection

Details Observations of Electron Vorticity in the Inner Plasmasheet and its Relationship to Reconnection Observations of Electron Vorticity in the Inner Plasmasheet and its Relationship to Reconnection

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm54a..03g&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM54A-03

Physics

Plasma Physics

[2700] Magnetospheric Physics, [2764] Magnetospheric Physics / Plasma Sheet, [7500] Solar Physics, Astrophysics, And Astronomy, [7835] Space Plasma Physics / Magnetic Reconnection

Scientific paper

Spatial derivatives of the electron moments can be estimated using data from the four Cluster spacecraft. Using spatial derivatives of the velocity we have computed the vorticity in the plasmasheet for several crossings. What we have found is that vorticity appears to be a common feature in the inner plasmasheet. We will show a number of examples. In at least some of the observations the vorticity is well correlated with the passage of Cluster through the ion diffusion region of known reconnection events. That most of the vorticity events observed are reconnection related cannot be dismissed and in fact observations of vorticity may provide a means to locate times when the Cluster spacecraft are magnetically connected to regions where reconnection is taking place. Understanding the role and source of the vorticity should advance our understanding of the dissipation of the turbulence associated with reconnection. In the course of the presentation we will also touch on the methods used to estimate the spatial derivatives as well as the limitations and assumptions involved.

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