Astronomy and Astrophysics – Astronomy
Scientific paper
May 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977soph...52..263l&link_type=abstract
Solar Physics, vol. 52, May 1977, p. 263-281.
Astronomy and Astrophysics
Astronomy
5
Chromosphere, Continuous Radiation, Infrared Astronomy, Photosphere, Solar Radiation, Stellar Spectrophotometry, Compression Waves, Infrared Detectors, Power Spectra, Solar Spectra, Submillimeter Waves, Temperature Gradients, Time Series Analysis
Scientific paper
Infrared continuum observations of the sun at wavelengths between 10 and 30 microns show a nonisothermal response of the upper photosphere to compression waves associated with the five-minute oscillations. Observations were made with four broad-band filters with effective transmission wavelengths between 10 and 26 microns and with a 10 arcsec aperture. Further observations at submillimeter wavelengths with a 2-arcmin aperture did not resolve oscillatory fluctuations of five-minute period. Comparisons with velocity-field data of Howard (1976) suggest that the relaxation time of the photosphere exceeds (300/2 pi) seconds at the height of formation of the 26-micron continuum. The photosphere reponds to 3-mHz oscillatory motion with considerably less compression than expected for simple acoustic modes in an adiabatically responsive atmosphere, confirming the evanescent character of the five-minute oscillations.
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