Velocity Fields in a Coronal Region with a Possible Hydromagnetic Interpretation.

The distribution of X 5303 half-widths in a coronal region shows an oscillatory pattern. This pattern, and the correlated gross Doppler displacements of the line, may arise from a transverse hydromagnetic wave in the corona. Longitudinal hydromagnetic waves are also considered, but they appear less consistent with observations than transverse waves. Magnetic field perturbations of 0.05 gauss in a 1-gauss field are adequate to explain the pattern.