The location of the source of high-frequency solar acoustic oscillations
- High Altitude Observatory, Boulder, CO (USA)
Recently Libbrecht and Jefferies et al. have reported regular peaks in the solar oscillation power spectrum extending well above 5.3 mHz, the maximum frequency of trapped acoustic modes. Kumar et al. argued that these peaks are primarily due to the interference of traveling waves which are excited due to acoustic emission from turbulent convection. In contrast with the standing wave P-mode frequencies below 5.3 mHz, the positions of the high-frequency interference peaks (HIPs) are dependent on the location of the source of the acoustic oscillations. In the present work, Kumar et al.'s argument is strengthened, and more importantly, use is made of the above dependence to determine the acoustic source strength as a function of depth. It is found that the acoustic source profile, and thus the convective velocity, is peaked about 200 km deeper than what is expected from standard mixing length theory. 13 refs.
- OSTI ID:
- 5261673
- Journal Information:
- Astrophysical Journal; (United States), Vol. 375; Other Information: L35-L39; ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
Similar Records
Numerical study of the direct pressure effect of acoustic waves in planar premixed flames
Reciprocity calibration of acoustic emission transducers in Rayleigh-wave and longitudinal-wave sound fields