Solar Rotation and Large-Scale Flows Measured by Time-Distance Helioseismology from Mdi
نویسندگان
چکیده
منابع مشابه
Time-distance Helioseismology with the Mdi Instrument: Initial Results
In time-distance helioseismology, the travel time of acoustic waves is measured between various points on the solar surface. To some approximation, the waves can be considered to follow ray paths that depend only on a mean solar model, with the curvature of the ray paths being caused by the increasing sound speed with depth below the surface. The travel time is aaected by various inhomogeneitie...
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The solar tachocline at the bottom of the convection zone is an important region for the dynamics of the Sun and the solar dynamo. In this region, the sound speed inferred by global helioseismology exhibits a bump of approximately 0.4% relative to the standard solar model. Global helioseismology does not provide any information on possible latitudinal variations or asymmetries between the North...
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Helioseismology has provided very detailed inferences about rotation of the solar interior. Within the convection zone the rotation rate roughly shares the latitudinal variation seen in the surface differential rotation. The transition to the nearly uniformly rotating radiative interior takes place in a narrow tachocline, which is likely important to the operation of the solar magnetic cycle. T...
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The variation of rotation in the convection zone over a period of two years from mid-1996 is studied using inversions of SOI-MDI data. We connrm the existence of near-surface banded zonal ows migrating towards the equator from higher latitudes, and reveal that these banded ows extend substantially beneath the surface, possibly to depths as great as 70 Mm (10 per cent of the solar radius). Our r...
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Recent progress in realistic simulations of solar convection have given us an unprecedented opportunity to evaluate the robustness of solar interior structures and dynamics obtained by methods of local helioseismology. We present results of testing the time-distance method using realistic simulations. By computing acoustic wave propagation time and distance relations for different depths of the...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1998
ISSN: 0074-1809
DOI: 10.1017/s0074180900238473