Modeling of magnetic reconnection in the magnetotail using global MHD simulation with an effective resistivity model

Details Modeling of magnetic reconnection in the magnetotail using global MHD simulation with an effective resistivity model Modeling of magnetic reconnection in the magnetotail using global MHD simulation with an effective resistivity model

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm21d..02d&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM21D-02

Physics

[2723] Magnetospheric Physics / Magnetic Reconnection, [2753] Magnetospheric Physics / Numerical Modeling, [2790] Magnetospheric Physics / Substorms

Scientific paper

Magnetic reconnection is considered to play an important role in space phenomena such as substorm in the Earth's magnetosphere. Tanaka and Fujita reproduced substorm evolution process by numerical simulation with the global MHD code [1]. In the MHD framework, the dissipation model is introduced for modeling of the kinetic effects. They found that the normalized reconnection viscosity, one of the dissipation model employed there, gave a large effect for the dipolarization, central phenomenon in the substorm development process, though that viscosity was assumed to be a constant parameter. It is well known that magnetic reconnection is controlled by microscopic kinetic mechanism. Frozen-in condition is broken due to particle kinetic effects and collisionless reconnection is triggered when current sheet is compressed as thin as ion kinetic scales under the influence of external driving flow [2, 3]. Horiuchi and his collaborators showed that reconnection electric field generated by microscopic physics evolves inside ion meandering scale so as to balance the flux inflow rate at the inflow boundary, which is controlled by macroscopic physics [2]. That is, effective resistivity generated through this process can be expressed by balance equation between micro and macro physics. In this paper, we perform substorm simulation by using the global MHD code developed by Tanaka [3] with this effective resistivity instead of the empirical resistivity model. We obtain the AE indices from simulation data, in which substorm onset can be seen clearly, and investigate the relationship between the substorm development and the effective resistivity model. [1] T. Tanaka, A, Nakamizo, A. Yoshikawa, S. Fujita, H. Shinagawa, H. Shimazu, T. Kikuchi, and K. K. Hashimoto, J. Geophys. Res. 115 (2010) A05220,doi:10.1029/2009JA014676. [2] W. Pei, R. Horiuchi, and T. Sato, Physics of Plasmas,Vol. 8 (2001), pp. 3251-3257. [3] A. Ishizawa, and R. Horiuchi, Phys. Rev. Lett., Vol. 95, 045003 (2005). [4] T. Tanaka, J. Comp. Phys. 111 (1994) 381.

Affiliated with

Also associated with

No associations

Rating

Modeling of magnetic reconnection in the magnetotail using global MHD simulation with an effective resistivity model 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 Modeling of magnetic reconnection in the magnetotail using global MHD simulation with an effective resistivity model, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Modeling of magnetic reconnection in the magnetotail using global MHD simulation with an effective resistivity model will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1890155