TOMOGRAPHY OF PLASMA FLOWS IN THE UPPER SOLAR CONVECTION ZONE USING TIME-DISTANCE INVERSION COMBINING RIDGE AND PHASE-SPEED FILTERING

The consistency of time-distance inversions for horizontal components of the plasma flow on supergranular scales in the upper solar convection zone is checked by comparing the results derived using two k- omega filtering procedures-ridge filtering and phase-speed filtering-commonly used in time-dist...

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Bibliographic Details
Published in:The Astrophysical journal 2013-09, Vol.775 (1), p.1-10
Main Author: Svanda, Michal
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
Consistency
CONVECTION
DISTANCE
Filtering
Filtration
Horizontal
Inversions
KERNELS
NOISE
Noise levels
PHASE VELOCITY
PLASMA
SOLAR GRANULATION
SUN
TIME DEPENDENCE
TOMOGRAPHY
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Summary:The consistency of time-distance inversions for horizontal components of the plasma flow on supergranular scales in the upper solar convection zone is checked by comparing the results derived using two k- omega filtering procedures-ridge filtering and phase-speed filtering-commonly used in time-distance helioseismology. I show that both approaches result in similar flow estimates when finite-frequency sensitivity kernels are used. I further demonstrate that the performance of the inversion improves (in terms of a simultaneously better averaging kernel and a lower noise level) when the two approaches are combined together in one inversion. Using the combined inversion, I invert for horizontal flows in the upper 10 Mm of the solar convection zone. The flows connected with supergranulation seem to be coherent only for the top ~5 Mm; deeper down there is a hint of change of the convection scales toward structures larger than supergranules.
ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/775/1/7