Thursday, August 1, 2013

1307.8372 (Thierry Corbard et al.)

Helioseismology from SODISM and HMI Intensity Images    [PDF]

Thierry Corbard, David Salabert, Patrick Boumier
Continuum intensity images from PICARD/SODISM and SDO/HMI covering a 209 days period in 2011 are analyzed in order to extract mode parameters for spherical harmonics up to $l=100$. SODISM helioseismology signal is affected by the low orbit of PICARD and by important gaps and CCD persistence effects. SODISM intensity signal has a lower signal to noise ratio and duty cycle than HMI and less modes were successfully fitted over the same period. A comparison of the rotation profiles obtained from both sets of continuum images shows however that the results remain compatible within one standard deviation of HMI formal errors.
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