Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-04-03
Astrophys.J. 646 (2006) 543-552
Astronomy and Astrophysics
Astrophysics
21 pages, 9 figures, Scheduled to appear in the ApJ 20 July 2006, v646n 1 issue
Scientific paper
10.1086/504705
It is well known that the observed amplitude of solar oscillations is lower in sunspots than in quiet regions of the Sun. We show that this local reduction in oscillation amplitudes combined with the phase-speed filtering procedure in time-distance helioseismic analyses could be a source of systematic errors in the range of 5 - 40% in the measured travel-time anomalies of acoustic waves around sunspots. Removing these travel time artifacts is important for correctly inferring the subsurface structure of sunspots. We suggest an empirical correction procedure and illustrate its usage for a small sunspot. This work utilizes data from MDI/SOHO.
Birch Aaron C.
Duvall Thomas L. Jr.
Rajaguru S. P.
Thompson Michael J.
Zhao Jun
No associations
LandOfFree
Sensitivity of time-distance helioseismic measurements to spatial variation of oscillation amplitudes I. Observations and a numerical model 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 Sensitivity of time-distance helioseismic measurements to spatial variation of oscillation amplitudes I. Observations and a numerical model, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sensitivity of time-distance helioseismic measurements to spatial variation of oscillation amplitudes I. Observations and a numerical model will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-500590