Is there an acoustic resonance in the solar chromosphere?

Details Is there an acoustic resonance in the solar chromosphere? Is there an acoustic resonance in the solar chromosphere?

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...374l..61w&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 374, June 20, 1991, p. L61-L63.

Astronomy and Astrophysics

Astrophysics

46

Chromosphere, Resonant Frequencies, Solar Atmosphere, Solar Oscillations, Calcium, K Lines, Solar Activity

Scientific paper

By comparing helioseismology data from 1986, 1988, and 1989, it was found that the frequecy dependence of the frequency perturbation of solar p-modes caused by solar activity drops abruptly for modes of frequency above approximately 3.9 mHz. The drop in the frequency dependence of the frequency shift may result from solar cycle changes in the chromosphere, provided that the chromosphere acts as a cavity in which p-modes are trapped (Goldreich et al.). No evidence is found in the temporal power spectrum of a time series of narrow-band Ca II K-line filtergrams of a resonance which would reveal the existence of a chromospheric cavity. This circumstance constrains the possible physical explanations of the frequency shifts.

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