Abstract
The 3D spontaneous fast reconnection model is applied to well-known signatures of geomagnetic substorms and solar flares. First, it is applied to the traveling compression regions (TCRs) associated with plasmoids propagating down the tail plasma sheet, known as a definite signature of geomagnetic substorms, and the in-situ satellite observations can be precisely explained, both qualitatively and quantitatively. Then, it is demonstrated that the magnetospheric current wedge drastically evolves through field-aligned currents to link the tail current to the auroral electrojet. It is also found that the well-known morphological features of two-ribbon flares can be explained by the fast reconnection model. In particular, the joule heating, associated with the flare current wedge, is shown to be important for the two-ribbon heating. Therefore, it is suggested that both solar flares and geomagnetic substorms result from the same physical mechanism, i.e., the fast reconnection mechanism.
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References
Birn, J., Quasi-steady current sheet structures with field-aligned flow, J. Geophys. Res., 97, 16,817–16,826, 1992.
Lui, A. T. Y., Current disruption in the Earth’s magnetosphere: observations and models, J. Geophys. Res., 101, 13067–13088, 1996.
Lui, A. T. Y., A multiscale model for substorms, Space Sci. Rev., 95, 325–345, 2001.
McPherron, R. L., C. T. Russel, and M. P. Aurbry, Satellite studies of magnetospheric substorms on August 15, 1968. 9. Phenomenological model for substorms, J. Geophys. Res., 78, 3131–3149, 1973.
Ono, Y. et al., Fast compression of a current sheet during externally driven magnetic reconnection, Earth Planets Space, 53, 521–526, 2001.
Petshcek, H. E., Magnetic field annihilation, in AAS-NASA Symposium on the Physics of Solar Flares, NASA Spec. Pub., SP-50, 425–439, 1964.
Shibata, K., Evidence of magnetic reconnection in solar flares and a unified model of flares, Astrophys. Space Sci., 264, 129–144, 1999.
Slavin, J. A. et al., ISEE 3 observations of traveling compression regions in the Earth’s magnetotail, J. Geophys. Res., 98, 15425–15446, 1993.
Ugai, M., Self-consistent development of fast magnetic reconnection with anomalous plasma resistivity, Plasma Phys. Controlled Fusion, 26, 1549–1563, 1984.
Ugai, M., Global dynamics and rapid collapse of an isolated current-sheet system enclosed by free boundaries, Phys. Fluids, 29, 3659–3667, 1986.
Ugai, M., Computer studies on development of the fast reconnection mechanism for different resistivity models, Phys. Fluids B, 4, 2953–2963, 1992.
Ugai, M., Computer studies on the spontaneous fast reconnection model as a nonlinear instability, Phys. Plasmas, 6, 1522–1531, 1999.
Ugai, M., Conditions for drastic evolution of magnetospheric current wedge, Phys. Plasmas, 14, 062902, 2007.
Ugai, M. and T. Tsuda, Magnetic field-line reconnexion by localized enhancement of resistivity. Part 1. Evolution in a compressible MHD fluid, J. Plasma Phys., 17, 337–356, 1977.
Ugai, M. and T. Shimizu, Computer studies on the spontaneous fast reconnection mechanism in three dimensions, Phys. Plasmas, 3, 853–862, 1996.
Ugai, M. and L. Zheng, Conditions for the fast reconnection mechanism in three dimensions, Phys. Plasmas, 12, 092312, 2005.
Ugai, M. and L. Zheng, Modeling of traveling compression regions in the Earth’s magnetotail by the spontaneous fast reconnection model, Phys. Plasmas, 3, 032901, 2006a.
Ugai, M. and L. Zheng, Parametric studies on traveling compression regions observed in the Earth’s magnetotail, Phys. Plasmas, 13, 062906, 2006b.
Ugai, M. and K. Kondoh, Evolution of magnetospheric current wedge by the spontaneous fast reconnection model, Phys. Plasmas, 13, 102903, 2006.
Vasyliunas, V. M., Theoretical models of magnetic field line merging, Rev. Geophys. Space Phys., 13, 303–336, 1975.
Young, R. and E. Hameiri, Approximate magnetotail equilibria with parallel flow, J. Geophys. Res., 97, 16789–16802, 1992.
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Ugai, M., Kondoh, K. & Shimizu, T. Modeling of substorms and flares by the fast reconnection mechanism. Earth Planet Sp 61, 561–564 (2009). https://doi.org/10.1186/BF03352922
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DOI: https://doi.org/10.1186/BF03352922