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We provide a new interpretation of ultraviolet transition region emissionline widths observed by the SUMER instrument on the Solar and HeliosphericObservatory (SOHO). This investigation is prompted by observations of thechromosphere at unprecedented spatial and temporal resolution from the SolarOptical Telescope (SOT) on Hinode revealing that all chromospheric structuresabove the limb display significant transverse (Alfvenic) perturbations. Wedemonstrate that the magnitude, network sensitivity and apparent center-to-limbisotropy of the measured line widths (formed below 250,000K) can be explainedby an observationally constrained forward-model in which the line width iscaused by the line-of-sight superposition of longitudinal and Alfvenic motionson the small-scale (spicular) structures that dominate the chromosphere and lowtransition region.

Reappraising Transition Region Line Widths in light of Recent Alfv\'{e}n Wave Discoveries