Phase-spectra of solar oscillations

Details Phase-spectra of solar oscillations Phase-spectra of solar oscillations

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mmsai..55..147s&link_type=abstract

(European Physical Society, Ministero della Pubblica Istruzione, and Universita di Catania, EPS Study Conference on Oscillations

Computer Science

Sound

21

Solar Oscillations, Solar Spectra, Chromosphere, Gravity Waves, Sound Waves, Wave Propagation

Scientific paper

Diode array measurements of intensity- and velocity-oscillations were made at the coude-telescope of Capri. From these observations phase-spectra were calculated to identify different types of waves within the solar atmosphere. The results indicate the existence of atmospheric gravity modes in the frequency-range below 2.5 mHz. No running acoustic waves were found in the photosphere for frequencies beyond 7.5 mHz. Vertical propagation seems only to take place for frequencies between 5 mHz and 7.5 mHz. No vertical propagation at all was found in the upper chromosphere. This seems to be due to the occurrence of wave reflection at the chromosphere-corona interface.

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