Short-period waves in small-scale magnetic flux tubes on the Sun.

Details Short-period waves in small-scale magnetic flux tubes on the Sun. Short-period waves in small-scale magnetic flux tubes on the Sun.

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...304l...1v&link_type=abstract

Astronomy and Astrophysics, v.304, p.L1

Astronomy and Astrophysics

Astrophysics

24

Sun: Faculae, Sun: Magnetic Fields, Small-Scale Magnetic Flux Tubes, Oscillations Of

Scientific paper

We present a time sequence of spectro-polarimetric measurements of high spatial and spectral resolution. It was obtained in the Fe I 6302A line from a moderately active region near disc centre of the Sun. The observation was performed with a two-dimensional spectrometer which uses a Fabry-Perot interferometer for wavelength scanning and to which a Stokes-V polarimeter was added. This allows us to follow horizontal motions of structures, here of small-scale magnetic elements, to study structural changes, and to measure vertical velocities of the magnetized plasma. In an isolated magnetic feature we find quasi-periodic horizontal motions with 2km/s amplitude and, with high statistical significance, vertical oscillations of 280m/s rms velocity and with periods near 100s. The energy flux in these short-period waves is estimated at 1.6-2.3x10^7^ergxcm-2/s, yet only for this isolated small feature. So the energy supply appears sufficient for chromospheric heating in bright structures of the Ca network, but it falls much below the needs to balance the radiative loss in larger plage areas.

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