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Additional Evidence Supporting a Model of Shallow, High-Speed SupergranulationRecently, Duvall and Hanasoge (Solar Phys. 287, 71, 2013) found that large distance separation [delta] travel-time differences from a center to an annulus [deltat(sub oi)] implied a model of the average super granular cell that has a peak upflow of 240 ms(exp −1) at a depth of 2.3 Mm and a corresponding peak outward horizontal flow of 700 ms(exp −1) at a depth of 1.6 Mm. In the present work, this effect is further studied by measuring and modeling center-to-quadrant travel-time differences [deltat(sub qu)], which roughly agree with this model. Simulations are analyzed that show that such a model flow would lead to the expected travel-time differences. As a check for possible systematic errors, the center-to-annulus travel-time differences [deltat(sub oi)] are found not to vary with heliocentric angle. A consistency check finds an increase of deltat(sub oi) with the temporal frequency [ν] by a factor of two, which is not predicted by the ray theory.
Document ID
20160007922
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
Authors
Duvall, T. L., Jr.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Hanasoge, S. M.
(Tata Inst. of Fundamental Research Mumbai, India)
Chakraborty, S.
(Stanford Univ. Stanford, CA, United States)
Date Acquired
June 27, 2016
Publication Date
April 30, 2014
Publication Information
Publication: Solar Physics
Publisher: Springer
Volume: 289
Issue: 9
e-ISSN: 1573-093X
Subject Category
Solar Physics
Report/Patent Number
GSFC-E-DAA-TN32014
Distribution Limits
Public
Copyright
Other
Keywords
Helioseismology
Supergranulation

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