OBSERVATIONS OF DOPPLER OSCILLATIONS IN A SOLAR PROMINENCE

We report on the observation of Doppler oscillations in a quiescent li mb prominence. Fourier analysis of the data reveals an oscillatory per iod of 7.5 min, whose phase varies linearly at 16 consecutive points ( 7280 km) along the slit. This yields an upper limit for the perturbati on wavelength of approximate to 20 000 km. Wavelet analysis confirms t he above period and indicates an oscillation lifetime of 12 min. Moreo ver, the disturbance appears to travel at a speed greater than 4.4 km s(-1). A comparison of these results with the predictions of some theo retical models is made.