SHORT-PERIOD WAVES IN SMALL-SCALE MAGNETIC-FLUX TUBES ON THE SUN

We present a time sequence of spectro-polarimetric measurements of hig h spatial and spectral resolution. It was obtained in the Fe I 6302 An gstrom line from a moderately active region near disc centre of the Su n. The observation was performed with a two-dimensional spectrometer w hich uses a Fabry-Perot interferometer for wavelength scanning and to which a Stokes-V polarimeter was added. This allows us to follow horiz ontal motions of structures, here of small-scale magnetic elements, to study structural changes, and to measure vertical velocities of the m agnetized plasma. In an isolated magnetic feature we find quasi-period ic horizontal motions with 2 km s(-1) amplitude and, with high statist ical significance, vertical oscillations of 280 m s(-1) rms velocity a nd with periods near 100 s. The energy flux in these short-period wave s is estimated at 1.6-2.3 10(7) erg cm(-2) s(-1), yet only for this is olated small feature. So the energy supply appears sufficient for chro mospheric heating in bright structures of the Ca network, but it falls much below the needs to balance the radiative loss in larger plage ar eas.