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Phase differences between intensity and doppler shift in each of the two bright emission lines of Sill at λ1816.93, λ1817.45 are determined for chromospheric oscillations with periods near 300 seconds and 95 seconds. Phase differences between the oscillations in the two lines are determined also.For the 300 second oscillation, maximum intensity most often leads maximum blue shift by about 40 seconds and the oscillation in the fainter line at λ 1817.45 most often leads the oscillation in thedoi:10.1017/s0252921100120111 fatcat:uaf5xmbenrbxvmbztumc5liqnu