Evidence for temporal variation in the acoustic and f-mode eigenfrequency spectrum of the Sun
Conference
·
OSTI ID:7182983
The power spectrum obtained from 1985 solar radiation intensity measurements was tested for evidence of frequency shifts of the low-order, low-degree acoustic modes and intermediate degree f-modes classified at SCLERA (Santa Catalina Laboratory for Experimental Relativity by Astrometry). These classifications were based on 1979 differential radius observations. Maxima in the coincidence rates between the peaks in the 1985 power spectrum and the classified frequency spectrum were found for frequency shifts (of the order of 0.05..mu..Hz) that are dependent on degree. These shifts indicate a change in eigenfrequency spectrum over a 6 year period. The coincidence rates between the peaks in the 1985 power spectrum and the classified frequency spectrum for multiplets taken in subgroups of approx.5 (same n and contiguous in /ell/) were typically 3 to 5 sigma above the accidental coincidence rate. Since these modes primarily reside in the convection zone, details of temporal changes of these eigenfrequencies should yield interesting information about the level of variations in the properties of the convection zone over, for example, the solar cycle. 13 refs., 1 fig., 2 tabs.
- Research Organization:
- Arizona Univ., Tucson (USA). Dept. of Physics
- DOE Contract Number:
- FG02-87ER13670
- OSTI ID:
- 7182983
- Report Number(s):
- DOE/ER/13670-T1; CONF-880780-4; ON: DE88015650
- Country of Publication:
- United States
- Language:
- English
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