Physics – Plasma Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh51a1984v&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SH51A-1984
Physics
Plasma Physics
[0654] Electromagnetics / Plasmas, [2721] Magnetospheric Physics / Field-Aligned Currents And Current Systems, [7526] Solar Physics, Astrophysics, And Astronomy / Magnetic Reconnection, [7831] Space Plasma Physics / Laboratory Studies And Experimental Techniques
Scientific paper
A magnetic flux rope is a series of twisted magnetic field lines whose pitch varies with radius. These structures are commonly observed in the solar corona and have been observed by satellites in the earth's magnetotail. Three magnetic flux ropes are created in a laboratory magnetoplasma (L = 16 m, ω pe/Ω e ˜ 20, Helium fill gas, B0z = 330 G, plasma diameter ˜ 100 ρ i). The ropes are created by drawing electron current from a cathode source to a remote anode, 11 m away. At the cathode source the current channels are each 1 inch diameter (several ρ i) and are spaced at 1.5 inch distance center to center. Each rope is kink unstable and produces magnetic fields on the order of 3% of B0z. Three dimensional magnetic field data is acquired from which the 3D current structure is calculated. The current channels are fixed to the cathode at one end, but are very dynamic far away from the cathode. They are seen to twist about each other and merge, and are seen to rotate as a whole in the electron diamagnetic direction with increasing radius of rotation further away from the current source. Cross correlation analysis of ion saturation current measurements revealed large drift modes (m=1,2,3,4,...) surrounding the current channels. Swept Langmuir probe measurements in a transverse plane show the spatial profile of the density and temperature associated with the flux ropes.
Gekelman W. N.
Pribyl Patrick
Van Compernolle B.
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