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Conference Paper

Assessment of far-side helioseismic holography using magnetograms obtained by Polarimetric and Helioseismic Imager onboard Solar Orbiter

Authors

Yang,  Dan
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Yang, D. (2023): Assessment of far-side helioseismic holography using magnetograms obtained by Polarimetric and Helioseismic Imager onboard Solar Orbiter, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-0805


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5016701
Abstract
Helioseismic holography is a useful method for detecting active regions on the Sun's far side using Earth-side observations of solar p modes. This method has been partially validated using far-side images of the chromosphere from STEREO/EUVI and photospheric magnetograms that are shifted in time to wait for active regions to come into Earth's view. During the cruise phase and the beginning of the nominal operation phase of the Solar Orbiter mission, the Polarimetric and Helioseismic Imager provided -- for the first time -- photospheric magnetograms on the Sun's far side. In this talk, I will use these magnetograms to directly assess the validity of far-side helioseismic holography. Seismic images will be computed using the improved method of Yang et al. (2023) applied to time series of Dopplergrams from SDO/HMI.