New light on solar infrared intensity oscillations

Details New light on solar infrared intensity oscillations New light on solar infrared intensity oscillations

Feb 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990soph..125..241l&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 125, Feb. 1990, p. 241-249.

Physics

8

Infrared Spectra, Solar Oscillations, Spectroheliographs, Astronomical Photometry, Power Spectra, Solar Cycles

Scientific paper

The detection of large-amplitude infrared solar intensity oscillations in the 5-min region is reported. The peak-to-peak intensity variation at 2.23 microns is found to be as high as 2.4 percent for a circular aperture of 2 arcmin and 0.8 percent in the full disk observations, i.e., remarkably higher than at the other four observed wavelength regions. The spatially-integrated power spectrum shows the 5-min oscillation plus a strong feature near 4 mHz. This feature coincides in frequency with the fundamental p-mode resonance of the chromosphere. However, a power-spectrum autocorrelation as well as a second-order Fourier transform of the data suggest that a high-frequency tail of the 5-min power spectrum is a more likely interpretation of this feature.

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