Physics
Scientific paper
Jan 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92..796f&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 92, Jan. 20, 1987, p. 796-800. SNSF-supported research.
Physics
36
Secular Variations, Solar Constant, Annual Variations, Irradiance, Power Spectra, Solar Activity, Solar Gravitation, Solar Oscillations
Scientific paper
The power of the irradiance variability spectrum from about 70 nHz (150 days) to 5 mHz (3.3 min) can be divided into three major domains with the following characteristics: (1) From 70 nHz to 2 μHz (5.8 - 150 days) the spectrum is dominated by solar activity, the power of which changes during the course of the solar cycle by up to 1 order of magnitude. (2) From 2 to 20 μHz (14 hours to 5.8 days) the spectrum follows a 1/ν2 law, which may be due to g modes. (3) From 20 μHz to 5 mHz (14 hours to 3.3 min) the spectrum follows a 1/ν law, with a broad peak around 5 min which is due to p modes yielding amplitudes of several ppm. As to the long-term changes, trends of the order of 0.02% per year seem to exist. The question whether the up and down trends with a peak around 1980 belong to an oscillatory modulation of the solar output can only be answered in the future.
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