HMI Ring-Diagram Analysis: Effects of Tracking, Noise, and Resolution
Sarbani Basu,R. S. Bogart +1 more
TLDR
In this article , the effects of different tracking rates, noise, and resolution on ring-diagram results were examined, and the largest effect that they found was that of spatial resolution.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. read more
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Journal ArticleDOI
The Helioseismic and Magnetic Imager (HMI) Investigation for the Solar Dynamics Observatory (SDO)
Philip H. Scherrer,Jesper Schou,R. I. Bush,Alexander G. Kosovichev,R. S. Bogart,J. T. Hoeksema,Yang Liu,Thomas L. Duvall,Junwei Zhao,A. M. Title,Carolus J. Schrijver,T. D. Tarbell,Steven Tomczyk +12 more
TL;DR: The Helioseismic and Magnetic Imager (HMI) instrument and investigation as a part of the NASA Solar Dynamics Observatory (SDO) is designed to study convection-zone dynamics and the solar dynamo, the origin and evolution of sunspots, active regions, and complexes of activity, the sources and drivers of solar magnetic activity and disturbances as mentioned in this paper.
Journal ArticleDOI
The Solar Oscillations Investigation - Michelson Doppler Imager
Philip H. Scherrer,R. S. Bogart,R. I. Bush,J. T. Hoeksema,Alexander G. Kosovichev,Jesper Schou,W. Rosenberg,L. Springer,T. D. Tarbell,A. M. Title,C. J. Wolfson,I. Zayer +11 more
TL;DR: The Michelson Doppler Imager (MDI) as mentioned in this paper was used to probe the interior of the Sun by measuring the photospheric manifestations of solar oscillations, revealing the static and dynamic properties of the convection zone and core.
Journal ArticleDOI
Design and Ground Calibration of the Helioseismic and Magnetic Imager (HMI) Instrument on the Solar Dynamics Observatory (SDO)
Jesper Schou,Philip H. Scherrer,R. I. Bush,R. Wachter,Sebastien Couvidat,M. C. Rabello-Soares,R. S. Bogart,J. T. Hoeksema,Yang Liu,Thomas L. Duvall,D. J. Akin,B. Allard,J. W. Miles,R. Rairden,R. A. Shine,T. D. Tarbell,A. M. Title,C. J. Wolfson,D. F. Elmore,Aimee A. Norton,Aimee A. Norton,Steven Tomczyk +21 more
TL;DR: The Helioseismic and Magnetic Imager (HMI) as discussed by the authors was designed to measure the Doppler shift, intensity, and vector magnetic field at the solar photosphere using the 6173 A FeI absorption line.
Book ChapterDOI
The Solar Oscillations Investigation — Michelson Doppler Imager
Philip H. Scherrer,R. S. Bogart,R. I. Bush,J. T. Hoeksema,Alexander G. Kosovichev,Jesper Schou,W. Rosenberg,L. Springer,T. D. Tarbell,A. M. Title,C. J. Wolfson,I. Zayer +11 more
TL;DR: The Solar Oscillations Investigation (SOI) as mentioned in this paper uses the Michelson Doppler Imager (MDI) instrument to probe the interior of the Sun by measuring the photospheric manifestations of solar oscillations.
Journal ArticleDOI
Rings and trumpets: three-dimensional power spectra of solar oscillations
TL;DR: In this paper, the relationship between the parameters of an elliptical approximation to the rings and the subphotospheric state was derived, and a numerical simulation was presented to indicate the presence of a flow of 100 m/s directed from the equator toward the south pole.