Abstract
Magnetic field configuration and flow pattern during near‐Earth reconnection are studied in a realistic two‐dimensional magnetotail with two different MHD simulations: (1) reconnection is forced at a given location by a nonuniform external inflow from the high‐latitude boundary and (2) reconnection is initiated at a given location by applying initially a small localized resistivity which is subsequently switched off. In both cases we found essentially the same sequence of events, namely, onset of reconnection, plasmoid formation and subsequent tailward motion of the plasmoid. We studied in detail the Earthward flow speed during the reconnection process. It is found that large and supersonic Earthward flows occur Earthward of the X point. However, these flows occur only in the central current sheet after the plasma sheet has been pinched off and ejected tailward as a plasmoid. At this time the plasma and field characteristics in the central current sheet are lobelike. The Earthward flow diverges around the plasma sheet and constitutes a boundary layer. The speed in the central part of the plasma sheet Earthward of the X point reaches maximum velocities up to 0.2 in dimensionless units for about 20 unit times. In dimensional units this corresponds to maximum velocities of about 70 km/s for about 6 min.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
