Is there a chromospheric mode at 6 mHz?

Details Is there a chromospheric mode at 6 mHz? Is there a chromospheric mode at 6 mHz?

Oct 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...302..277s&link_type=abstract

Astronomy and Astrophysics, v.302, p.277

Astronomy and Astrophysics

Astrophysics

22

Sun: Oscillations, Sun: Chromosphere

Scientific paper

We present time series of Na D_1_ and Ca K_2v_ filtergrams of the quiet sun obtained simultaneously with the Vacuum Tower Telescope at Observatorio del Teide, Tenerife. Special interest is taken in the distribution of power in the Fourier domain. We distinguish power "on" and "between" the ridges of the p-modes and pseudo p-modes. The latter are found to extend beyond the acoustic cutoff frequency up to 12mHz in Na D_1_ and 8.5mHz in Ca K_2v_. Most of the power of the broad chromospheric feature detected in Ca II K by Harvey et al. (???) in the background of a one-dimensional power spectrum is found preferentially between the p-mode ridges at about 6mHz, as our two-dimensional analysis reveals. This behaviour would be consistent with the nature of "avoided crossing" (Ulrich & Rhodes ???) of a chromospheric mode and the p-modes. We note that the center frequency of the interridge feature appears independent of height, whereas the power distribution of the p-mode ridges extends to higher frequencies as height increases. We suppose that different mechanisms are responsible for the generation of these two wave fields. In our investigation the broad band of enhanced power at 6mHz is even more conspicuous in Na D_1_ than in Ca K_2v_.

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