2.1 Magnetohydrodynamic (MHD) Discontinuities 2.2 Variation of Physical Quantities Across Expansion Waves 2.3 Formulation of the Riemann Problem 31 2.4 Structure of the Reconnection Layer in Cases with B y = 0 2.5 Structure of the Reconnection Layer in Cases with B y ^ 0

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Magnetic field reconnection plays a crucial role in determining the topology of magnetic fields in cosmic plasmas and also provides an efficient way for the conversion of magnetic energy into kinetic energy. Much work has been done on this topic in many interrelated fields of interest by many researchers. The author's primary field of interest is magnetospheric physics, in particular, magnetic reconnection processes in the dayside magnetopause and the magnetotail. Understanding of these processes has improved greatly over the past 3 decades, but there is still much work to be done.

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