Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm51b2088s&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SM51B-2088
Physics
[2723] Magnetospheric Physics / Magnetic Reconnection, [2744] Magnetospheric Physics / Magnetotail, [2752] Magnetospheric Physics / Mhd Waves And Instabilities
Scientific paper
Three-dimensional MHD instability for the spontaneous fast magnetic reconnection was studied under the shear field condition and the formation of oblique neutral line, in order to apply to space plasma observations in THEMIS and Cluster. In our previous studies under the current-driven anomalous resistivity, it was shown that one-dimensional current sheet (the Harris sheet) is unstable for three-dimensional resistive perturbation, resulting in three-dimensionally localized, intermittent and random fast reconnection process. In space plasmas, one-dimensional current sheet will be ubiquitous and is believed to be a source region of explosive plasma phenomena, such as solar flares and geomagnetic substorms. However, it was unclear how the 3D fast reconnection is localized in such 1D current sheet. According to our studies, the 3D fast reconnection can be triggered by any weak 3D effect, such as waves and plasma flows stagnating in the current sheet, and then is nonlinearly developed. Finally, the fast reconnection process becomes unsteady, intermittent and random. In recent, it was reported that the intermittent and snake-like plasma downflow jets often observed in solar flares, e.g. TRACE EUV data, can be well explained by our three-dimensional fast reconnection model. Then, we are now trying to apply our model to the geomagnetic substorms observed in THEMIS, Cluster and GEOTAIL. In comparison with solar flare observations, the observation data obtained in geomagnetic substorms is more fine, and hence, we can explore the details of how the 3D fast reconnection is caused. In this presentation, we report how our 3D fast reconnection model is modified by the shear field effect and oblique formation of active neutral lines, collaborating with observation data and MHD numerical study.
Kondoh Koji
Shimizu Toshifumi
Ugai Masayuki
No associations
LandOfFree
Three dimensional MHD spontaneous fast reconnection for the shear field effect and oblique neutral line formation 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 Three dimensional MHD spontaneous fast reconnection for the shear field effect and oblique neutral line formation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Three dimensional MHD spontaneous fast reconnection for the shear field effect and oblique neutral line formation will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1891497