Abstract
Ring-diagram analysis is a standard local helioseismic technique. Data from the Helioseismic and Magnetic Imager (HMI) onboard the Solar Dynamics Observatory (SDO) are routinely used for ring-diagram analysis, and fits to the power spectra as well as inversion results are standard data products. In this article we examine the effects of different tracking rates, noise, and resolution on ring-diagram results. Most of the analysis is for \(15^{\circ}\) tiles, but we also examine the effects of different tile sizes. The largest effect that we find is that of spatial resolution. Doppler noise has very little effect on the results, except perhaps at the deepest regions for which the tiles can give reliable results; variations in the tracking rate have a similar effect.
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Data Availability
The HMI data used in this article are publicly available from the JSOC at jsoc.stanford.edu. The fitted parameters of the rings diagrams and inversion results used for the current study are available from the corresponding author on reasonable request.
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Acknowledgments
This work uses data from the Helioseismic and Magnetic Imager. HMI data are courtesy of NASA/SDO and the HMI science team.
This research was supported in part by NASA Contract NAS5-02139 to Stanford University.
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R.S. Bogart created the ring diagrams and determined the mode parameters. S. Basu did the inversions. S. Basu prepared the figures. Both S. Basu and R.S. Bogart wrote and reviewed the txt.
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Basu, S., Bogart, R.S. HMI Ring-Diagram Analysis: Effects of Tracking, Noise, and Resolution. Sol Phys 297, 101 (2022). https://doi.org/10.1007/s11207-022-02034-0
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DOI: https://doi.org/10.1007/s11207-022-02034-0