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The Very high Angular resolution ULtraviolet Telescope (VAULT) is a soundingrocket payload built to study the crucial interface between the solarchromosphere and the corona by observing the strongest line in the solarspectrum, the Ly-a line at 1216 {\AA}. In two flights, VAULT succeeded inobtaining the first ever sub-arcsecond (0.5") images of this region with highsensitivity and cadence. Detailed analyses of those observations havecontributed significantly to new ideas about the nature of the transitionregion. Here, we present a broad overview of the Ly-a atmosphere as revealed bythe VAULT observations, and bring together past results and new analyses fromthe second VAULT flight to create a synthesis of our current knowledge of thehigh-resolution Ly-a Sun. We hope that this work will serve as a good referencefor the design of upcoming Ly-a telescopes and observing plans.

The Structure and Dynamics of the Upper Chromosphere and Lower Transition Region as Revealed by the Subarcsecond VAULT Observations