Time-Distance Measurements of Subsurface Rotation and Meridional Flow
Abstract
One of the most promising applications of time-distance helioseismology is the measurement of flows beneath the solar surface. In some cases the time-distance approach can yield information which cannot be obtained with more traditional helioseismology. Recently this technique has been used to measure the global meridional circulation (Giles et al., 1997) and differential rotation (Giles & Duvall, 1997). So far, these meaurements have only been able to penetrate a short distance into the solar interior --- up to a few percent of the solar radius. We will present the results of work which extends these measurements to greater depths, with a special focus on the meridional circulation. Probing this deeper region, while simple in principle, offers significant practical challenges. We will present a brief analysis of these difficulties along with our new results.
- Publication:
-
Structure and Dynamics of the Interior of the Sun and Sun-like Stars
- Pub Date:
- 1998
- Bibcode:
- 1998ESASP.418..775G