Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-07-02
Astronomy and Astrophysics
Astrophysics
29 pages, 11 figures, accepted for publication in ApJ
Scientific paper
10.1086/591514
The frequencies of solar oscillations are known to change with solar activity. We use Principal Component Analysis to examine these changes with high precision. In addition to the well-documented changes in solar normal mode oscillations with activity as a function of frequency, which originate in the surface layers of the Sun, we find a small but statistically significant change in frequencies with an origin at and below the base of the convection zone. We find that at r=(0.712^{+0.0097}_{-0.0029})R_sun, the change in sound speed is \delta c^2 / c^2 = (7.23 +/- 2.08) x 10^{-5} between high and low activity. This change is very tightly correlated with solar activity. In addition, we use the splitting coefficients to examine the latitudinal structure of these changes. We find changes in sound speed correlated with surface activity for r >~ 0.9R_sun.
Baldner Charles S.
Basu Sarbani
No associations
LandOfFree
Solar Cycle Related Changes at the Base of the Convection Zone does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Solar Cycle Related Changes at the Base of the Convection Zone, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Solar Cycle Related Changes at the Base of the Convection Zone will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-114838