Plasmoid-like structures in multiple X line Hall MHD reconnection

Details Plasmoid-like structures in multiple X line Hall MHD reconnection Plasmoid-like structures in multiple X line Hall MHD reconnection

Oct 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009jgra..11410208l&link_type=abstract

Journal of Geophysical Research, Volume 114, Issue A10, CiteID A10208

Physics

2

Magnetospheric Physics: Magnetic Reconnection (7526, 7835), Magnetospheric Physics: Magnetotail, Magnetospheric Physics: Numerical Modeling, Magnetospheric Physics: Magnetospheric Configuration And Dynamics

Scientific paper

Driven by a waveform inflow, multiple X line reconnection is initiated in a long current layer, and the plasmoids are bound between two neighboring reconnection sites. We investigate the behaviors of the plasmoid-like structures in the absence and presence of an initial guide field B y0 normalized by B 0 (B 0 is the initial intensity of B x field at the top and bottom boundaries of the simulation domain) using a Hall magnetohydrodynamic (MHD) code. For the case with B y0 = 0 the profiles of the out-of-plane B y component are the bipolar signature or the bipolar wavelike signature which is caused by Hall effect and independent of the external mechanism. Such B y features are in line with the observed signature of a closed-loop-like plasmoid in the magnetotail. The bipolar and fluctuation signatures of B y have an asymmetric feature in the presence of a small B y0(= 0.1), and the B y profile becomes a positive signature as B y0 reaches or exceeds 0.3. In the case of B y0 = 0.5, a B y bulge appears in the B y signature when the enhanced B y regions caused by Hall effect take place in the plasmoid. The B y bulge evolves into a peaking signature, whose maximum (B y ∣max) is quickly raised and approaches the lobe magnetic field strength. Such a significant enhancement of the B y component in the central region of the plasmoid might be representative of the observed strong core field in the magnetic flux rope. The present results indicate the following implications: (1) Hall effect and a preexisting cross-tail component B y are two important factors controlling the occurrence of various plasmoid-like structures in the magnetotail. (2) In the later phase the nonlinear interaction between Hall effect and the B y flux added by the plasma inflow makes a most important contribution to the growth of the core B y field.

Affiliated with

Also associated with

No associations

Rating

Plasmoid-like structures in multiple X line Hall MHD reconnection does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Plasmoid-like structures in multiple X line Hall MHD reconnection, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Plasmoid-like structures in multiple X line Hall MHD reconnection will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1517089