Abstract
The chromosphere-corona transition region of the Sun enjoys both simplicities of character and complexities of character which result from its very thin geometrical extent. The simplicities derive from the reasonably clear view of the energy balance (both observationally and theoretically), while the complexities derive from both the proximity of the not-so-clearly viewed regions below and above, and the almost certain convolutions and perhaps discontinuities in the three dimensional geometry of the transition sheet. While observational resolution and spectral information has improved greatly in recent years, the problems associated with a single vantage point, the Earth and its environs, have not gone away. To understand the transition region we must resolve structures radially and temporally as well as in the plane of the sky.
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