Dynamics of the solar atmosphere. VI. Resonant oscillations of an atmospheric cavity: observations.

Details Dynamics of the solar atmosphere. VI. Resonant oscillations of an atmospheric cavity: observations. Dynamics of the solar atmosphere. VI. Resonant oscillations of an atmospheric cavity: observations.

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...307..936d&link_type=abstract

Astronomy and Astrophysics, v.307, p.936-946

Astronomy and Astrophysics

Astrophysics

29

Sun: Atmosphere, Chromosphere, Oscillations

Scientific paper

We have evaluated new, spatially one- and two-dimensional time series of photospheric and chromospheric Fraunhofer lines at a large number of positions in the line profile, with the 'lambdameter' method. As a result we have obtained the velocity and brightness fluctuations corresponding to many closely staggered height levels in the atmosphere, and their respective phase spectra as a diagnostic of the wave fields involved. This material has not only served to define more accurately and specifically the character of the 180deg phase jump observed before in V-I spectra of the NaD_2_ line in internetwork regions, and to reveal the narrow height interval that gives rise to this discontinuity in the phase spectra. We have also discovered another discontinuity in V-V spectra of the same Fraunhofer line at nearly the same frequency (7.0mHz). Since neither running nor standing waves alone can explain the observed solitary phase discontinuities, our results provide strong evidence in favour of an atmosphere that supports (at least, and probably more than) one eigenmode as a component of the wave field.

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