LONG AND SHORT-TERM VARIABILITY OF THE EMISSION-LINES IN THE NUCLEAR-SPECTRUM OF THE SEYFERT-GALAXY NGC-7469

23 spectrograms of the nucleus of the Seyfert galaxy NGC 7469 in the o ptical region have been obtained at the prime focus of the 6-m telesco pe during 1977 January 13-15, while the nucleus was at minimum brightn ess. Spectral dispersion was similar to 95 Angstrom/mm, spectral resol ution similar to 8 Angstrom. Equivalent widths, relative intensities a nd profiles of the emission lines H-gamma, H-beta, [OIII]lambda lambda 4959, 5007 Angstrom Angstrom, (H-alpha+[NII]) and [SII]lambda lambda 6717, 6731 Angstrom Angstrom were studied to reveal their night-to-nig ht variability. The variations were found of profiles of Balmer lines, of relative intensities (H-alpha+[NII])/H-beta, and of [OIII](4959+50 07)/H-beta. We suppose that this variability is produced by gas flares , with durations of several days. We have compared the obtained spectr al properties of the nucleus with published colours and spectral prope rties observed by other authors during 1943-1986. The relation and cha racter of variability of the line ratios (H-alpha + [NII])/H-beta and [OIII]/H-beta on neighbouring nights are the same as for monthly and a nnual observations. Profiles of the Palmer lines contain variable comp onents keeping their positions during 20 years. These can be understoo d as reflecting the ingredients in the gaseous structure of the NGC 74 69 nucleus, which change their brightness with time without changing t heir velocities.