The fine structure of prominences. III

Faint, Doppler shifted, emission features are detected in high resolution spectra of limb prominences. Their average line-of-sight velocity is about 3 x 106 cms-1, their average life time is 300 s, and their angular sizes are < approximately 108 cm in our spectrograms. The emission line width of the spectral features increases with increasing line shift. Some implications on the stability of prominences by these structures are discussed briefly. (Auth.)