Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002apj...580l.181w&link_type=abstract
The Astrophysical Journal, Volume 580, Issue 2, pp. L181-L184.
Astronomy and Astrophysics
Astronomy
10
Stars: Oscillations, Sun: Activity, Sun: Interior, Sun: Oscillations
Scientific paper
A very simple mathematical sequence is detected in a half-century of thermal radio flux from the Sun. Since the only known solar source for the sequence is global oscillations trapped in the nonconvecting interior, g-modes and probably r-modes are active. If so, their rotation frequencies are detected and some previously reported difference frequencies are confirmed with high confidence. All angular harmonics for 2<=l<=7 are detected as well as some others up to the limit l<=14 resolvable by the observations (a Fourier spectrum of the 10.7 cm flux time series). The mean sidereal rotation rate of the nonconvecting interior is 428.2 nHz as averaged by g-modes and 429.8 nHz by the r-modes, indicating that g-mode energy is a bit more centrally concentrated. Helioseismology measures such rotation rates near 0.36R (R = solar radius), so the global modes would have about half their kinetic energy above and below that level. This, and the known log (r) energy dependence of most modes, implies that these oscillations are significantly reflected near 0.18R, the same level at which sound speed measurements display a maximum departure from theoretical models.
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