Nested Structure of Hall Magnetic Field in Collisionless Magnetic Reconnection with Multiple Reconnection Sites

Details Nested Structure of Hall Magnetic Field in Collisionless Magnetic Reconnection with Multiple Reconnection Sites Nested Structure of Hall Magnetic Field in Collisionless Magnetic Reconnection with Multiple Reconnection Sites

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm21a1555j&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM21A-1555

Physics

[0654] Electromagnetics / Plasmas, [2723] Magnetospheric Physics / Magnetic Reconnection, [2744] Magnetospheric Physics / Magnetotail

Scientific paper

The development of the electron scale structure of the Hall magnetic field in the early phase of reconnection, which is dominated by electron dynamics, is investigated using electron-magnetohydrodynamic simulations. The quadrupole structure of the Hall magnetic field, which forms at each reconnection site, gets modified in the presence of multiple sites one of which is dominant and others are secondary. The interaction of inflow to the secondary site and outflow from the central dominant site gives rise to the nested structure of quadrupoles. The interaction of outflows from secondary and dominant site introduces dipolar structures inside central quadrupole. The possible signatures of nested structure of quadrupoles in cluster observations are pointed out. These structures form when there is one dominant site with other secondary sites, which is the likely case in nature. If strength of all the sites are same, a different variety of structures may form. These structures have important implications for multi-spacecraft missions in Earth's magnetotail.

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