GONG Time distance pipeline status Shukur Kholikov.

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Presentation transcript:

GONG Time distance pipeline status Shukur Kholikov

Outline Short description Some results and examples m=0 exercise

GONG merged velocity images 800x800 pix 1440 images

Remaping Use ± 70º in latitude and longitude Track relatively noon time of each day Apply backward filter (optional) Line of sight correction (optional) Produce daily acoustic power maps (optional, for future use)

Acoustic powermap example

Acoustic powermap with one single ‘dead pixel

SHT computations Lmax=550 (default) Option for any target region or hemispheres Mask-out active regions (optional)

Phase velocity filter Predefined 3 depths 7,12,30 Mm Option to filter out f-ridge Option to keep only f-modes

Reconstruction ± 57 in latitude and ± 50 in longitude Lat-Long or sin(Lat)-Long Corresponding acoustic power map

Cross-correlations Average, north-south, east-west Gabor wavelet fitting Demodulation and cos-fitting

Optional output products SH time-series LNU diagram for individual days Phase velocity filtered reconstructed images Travel times or differences Longitude averaged time series

North-south travel time differences ( Depth  7 Mm )

North-south travel time differences ( Depth  12 Mm )

North-south travel time differences ( Depth  30 Mm )

Meridional flow profile measurements with SOHO/MDI U.Mitra-Kraev and M.J.Thompson Astron.Nachr./ AN 328, 10, 2007

m=0 GONG 150 days

Travel time differences from longitudinal averaged images