Abstract
AbstractObservations of He II 304Å line profiles from the Goddard solar EUV sounding rocket flight of May 9, 1991 are analyzed to determine lower limits on the small scale non-thermal velocities in the regions observed. In the quiet Sun, a lower limit of 30 km/s is obtained over much of the spectrograph slit. It is argued that a sufficient fraction of the He II ions will survive in their upward motions, before collisional excitation to produce a 304Å photon, to enhance the computed line intensity up to the observed values, in contrast to earlier theoretical results that yield total line intensities generally smaller than observed values.
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