Other
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm53a1426m&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SM53A-1426
Other
2723 Magnetic Reconnection (7526, 7835), 2744 Magnetotail, 2753 Numerical Modeling, 2784 Solar Wind/Magnetosphere Interactions
Scientific paper
With the recent development of super-computers, large scale 3D computer simulations for space plasmas are getting practical. We obtain variety of 3D structures or configurations from 3D numerical simulations. However, techniques and environments for analyzing the 3D space plasma simulation data have not been established. We have been developing a data analysis environment using various types of 3D visualization techniques and virtual reality systems. It is well known that the Earth's magnetosphere shows complex 3D magnetic topologies when the IMF By component is predominant. We used 3D Global MHD simulations with southward IMF and non-zero By to study interactions between the IMF and the Earth's magnetosphere. We found that magnetic flux ropes in the Earth's magnetotail is generated and propagates tailward. However, the process of origin and generation of 3D magnetic topologies of magnetic flux ropes, especially the source of the By components in the flux ropes, is not clarified. In this study, we analyze 3D magnetic field topology of magnetic flux ropes by using 3D visualization analysis environment such as virtual reality (VR) system and 3D haptic device "PHANToM". These systems provide us with force feedback and 3D object manipulation capability in 3D virtual space. First, we classified magnetic field topology of magnetic flux ropes (and vicinity of the magnetic flux ropes) into the following ten types: (1)IMF-IMF (helical), (2)IMF-Earth (helical), (3)Earth-Earth (helical), (4)IMF-IMF (not helical), (5)IMF-Earth (not helical), (6)Earth-Earth (not helical), (7)closed (not helical), (8)IMF-IMF (not flux rope), (9)IMF-Earth (not flux rope), (10)Earth-Earth (not flux rope). This classification are carried out by using the "PHANToM" Next, we analyzed the time-dependent profiles of each magnetic field topology. As a result, we found the following processes taking place to produce a magnetic flux rope: (1)Earth-Earth (helical) field lines are reconnected to Earth-IMF (helical) field lines, (2)Earth-IMF (helical) field lines are reconnected to IMF-IMF (helical) field lines, (3)magnetic flux ropes separated from the Earth field line and move tailward because all of the Earth-Earth (helical) field lines are reconnected. In this presentation, we discuss the process of magnetic flux rope's generation and suggest the 3D time- dependent model of magnetic topology including all other magnetic reconnections (such as at dayside magnetosphere, magnetopause flank and magnetotail). We also discuss the efficiency of our 3D visualization analysis environment using visual and haptic virtual reality system. We believe that this analysis environment provides Earth and space science researchers with new research method to achieve new scientific findings.
Fujita Shigeo
Matsuoka D.
Murata Keizo
Tanaka Toshiaki
Yamamoto Kaichi
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