Meridional Circulation Variability from Large‐Aperture Ring‐Diagram Analysis of Global Oscillation Network Group and Michelson Doppler Imager Data

2006 ◽  
Vol 638 (1) ◽  
pp. 576-583 ◽  
Author(s):  
I. Gonzalez Hernandez ◽  
R. Komm ◽  
F. Hill ◽  
R. Howe ◽  
T. Corbard ◽  
...  
Keyword(s):  
Meridional Circulation ◽  
Michelson Doppler Imager ◽  
Global Oscillation ◽  
Large Aperture ◽  
Global Oscillation Network Group ◽  
Doppler Imager ◽  
Ring Diagram ◽  
Oscillation Network ◽  
Diagram Analysis

scholarly journals The Global Oscillation Network Group (GONG) Project

Science ◽  
1996 ◽  
Vol 272 (5266) ◽  
pp. 1284-1286 ◽  
Author(s):  
J. W. Harvey ◽  
F. Hill ◽  
R. P. Hubbard ◽  
J. R. Kennedy ◽  
J. W. Leibacher ◽  
...  
Keyword(s):  
Global Oscillation ◽  
Global Oscillation Network Group ◽  
Oscillation Network

scholarly journals New Developments in Local Area Helioseismology

2001 ◽  
Vol 203 ◽  
pp. 159-166 ◽  
Author(s):  
T. L. Duvall ◽  
A. G. Kosovichev
Keyword(s):  
Convection Zone ◽  
Meridional Circulation ◽  
Active Regions ◽  
Local Area ◽  
Back Side ◽  
New Developments ◽  
Ring Diagram ◽  
Local Areas ◽  
Time Distance ◽  
Diagram Analysis

Several techniques are used to study local areas in helioseismology, including time-distance helioseismology, acoustic imaging/holography, and ring diagram analysis. These techniques can be used to study flows, magnetic fields, and temperature inhomogeneities. The “local” area studied can be as small as a supergranule, or as large as the entire convection zone in the case of meridional circulation as studied by Giles and colleagues. Active regions have been studied with some interesting results, with complicated flow patterns below sunspots and detectable sound speed inhomogeneities in the 10 Mm below the spots. Another interesting result is the detection of sunspots on the back side of the Sun by Lindsey and Braun using the holography technique. A confirmation of their result using the time-distance technique is presented.

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