Mathematics – Logic
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm23a1195h&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SM23A-1195
Mathematics
Logic
2723 Magnetic Reconnection (7526, 7835), 2744 Magnetotail, 2764 Plasma Sheet, 7833 Mathematical And Numerical Techniques (0500, 3200)
Scientific paper
Southward-then-northward magnetic perturbations are often seen in the tail plasma sheet, along with earthward jets, but the generation mechanism of such bipolar Bz (magnetic flux rope created through multiple X-line reconnection, transient reconnection, or else) has been controversial. At ~23:13 UT on 13 August 2002, Cluster encountered a bipolar Bz at the leading edge of an earthward jet, with one of the four spacecraft in the middle of the current sheet. Application to this bipolar signature of Grad-Shafranov (GS) reconstruction, the technique for recovery of two-dimensional (2D) magnetohydrostatic structures, suggests that a flux rope with diameter of ~2 RE was embedded in the jet. To investigate the validity of the GS results, the technique is applied to synthetic data from a 3D MHD simulation, in which a bipolar Bz can be produced through localized (3D) reconnection in the presence of guide field By [Shirataka et al., JGR, 2006] without invoking multiple X-lines. A flux rope-type structure, which does not in fact exist in the simulation, is reconstructed but with a shape elongated in the jet direction. Unambiguous identification of a mechanism that leads to an observed bipolar Bz thus seems difficult based on the topological property in the GS maps. We however infer that a flux rope was responsible for the bipolar pulse in this particular Cluster event, because the recovered magnetic structure is roughly circular, suggesting a relaxed and minimum energy state. Our results also indicate that one has to be cautious about interpretation of some (e.g., force-free, or magnetohydrostatic) model-based results.
Fujimoto Minoru
Hasegawa Hidenao
Khotyaintsev Yu.
Lucek Elisabeth A.
Nakamura Riou
No associations
LandOfFree
Reconstruction of a bipolar magnetic signature in an earthward jet in the tail: Flux rope or 3D guide-field 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 Reconstruction of a bipolar magnetic signature in an earthward jet in the tail: Flux rope or 3D guide-field reconnection?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Reconstruction of a bipolar magnetic signature in an earthward jet in the tail: Flux rope or 3D guide-field reconnection? will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1422800