Oscillations of the sun with a period of 159.966 minutes in the Crimean 25-year observations

Details Oscillations of the sun with a period of 159.966 minutes in the Crimean 25-year observations Oscillations of the sun with a period of 159.966 minutes in the Crimean 25-year observations

Jan 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000kfnt...16...49k&link_type=abstract

Kinematika i Fizika Nebesnykh Tel, vol. 16, no. 1, p. 49-59

Physics

4

Scientific paper

Measurements of low-degree oscillations of the Sun were carried out at the Crimean Astrophysical Observatory during 25 years (1974-1998; in all 1530 days, about 9733 hours). These data showed that within the frequency range near the 9th daily harmonic the most significant oscillation corresponds to the period P1 = 159.9660± 0.0010 min. It agrees well with the main periodicity PSt = 159.9663±0.0014 min found earlier in the similar Doppler measurements of the solar photosphere performed at the Stanford University in 1977-1994. The initial phase of the P1 oscillation is found to be remarkably stable over the entire 25-year interval. This phenomenon cannot be ascribed to some terrestrial cause or to an artifact of the data reduction procedure. It presents a challenging problem for the physics of the Sun and models of its interior structure.

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