Search Results - "Scherrer, P. H"

The Helioseismic and Magnetic Imager (HMI) Investigation for the Solar Dynamics Observatory (SDO) by Scherrer, P. H., Schou, J., Bush, R. I., Kosovichev, A. G., Bogart, R. S., Hoeksema, J. T., Liu, Y., Duvall, T. L., Zhao, J., Title, A. M., Schrijver, C. J., Tarbell, T. D., Tomczyk, S.

“…The Helioseismic and Magnetic Imager (HMI) instrument and investigation as a part of the NASA Solar Dynamics Observatory (SDO) is designed to study…”
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Observables Processing for the Helioseismic and Magnetic Imager Instrument on the Solar Dynamics Observatory by Couvidat, S., Schou, J., Hoeksema, J. T., Bogart, R. S., Bush, R. I., Duvall, T. L., Liu, Y., Norton, A. A., Scherrer, P. H.

“…NASA’s Solar Dynamics Observatory (SDO) spacecraft was launched 11 February 2010 with three instruments onboard, including the Helioseismic and Magnetic Imager…”
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Design and Ground Calibration of the Helioseismic and Magnetic Imager (HMI) Instrument on the Solar Dynamics Observatory (SDO) by Schou, J., Scherrer, P. H., Bush, R. I., Wachter, R., Couvidat, S., Rabello-Soares, M. C., Bogart, R. S., Hoeksema, J. T., Liu, Y., Duvall, T. L., Jr, Akin, D. J., Allard, B. A., Miles, J. W., Rairden, R., Shine, R. A., Tarbell, T. D., Title, A. M., Wolfson, C. J., Elmore, D. F., Norton, A. A.., Tomczyk, S.

“…The Helioseismic and Magnetic Imager (HMI) investigation will study the solar interior using helioseismic techniques as well as the magnetic field near the…”
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Comparison of Line-of-Sight Magnetograms Taken by the Solar Dynamics Observatory/Helioseismic and Magnetic Imager and Solar and Heliospheric Observatory/Michelson Doppler Imager by Liu, Y., Hoeksema, J. T., Scherrer, P. H., Schou, J., Couvidat, S., Bush, R. I., Duvall, T. L., Hayashi, K., Sun, X., Zhao, X.

“…We compare line-of-sight magnetograms from the Helioseismic and Magnetic Imager (HMI) onboard the Solar Dynamics Observatory (SDO) and the Michelson Doppler…”
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On-Orbit Performance of the Helioseismic and Magnetic Imager Instrument onboard the Solar Dynamics Observatory by Hoeksema, J. T., Baldner, C. S., Bush, R. I., Schou, J., Scherrer, P. H.

“…The Helioseismic and Magnetic Imager (HMI) instrument is a major component of NASA's Solar Dynamics Observatory (SDO) spacecraft. Since commencement of full…”
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Spectral Line Selection for HMI: A Comparison of Fe I 6173 Å and Ni I 6768 Å by Norton, A. A., Graham, J. Pietarila, Ulrich, R. K., Schou, J., Tomczyk, S., Liu, Y., Lites, B. W., Ariste, A. López, Bush, R. I., Socas-Navarro, H., Scherrer, P. H.

“…We present a study of two spectral lines, Fe I 6173 Å and Ni I 6768 Å, that were candidates to be used in the Helioseismic and Magnetic Imager (HMI) for…”
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A subsurface flow of material from the Sun's equator to its poles by Giles, P. M, Duvall, T. L, Scherrer, P. H, Bogart, R. S

“…Gas on the Sun's surface has been observed to flow away from the equator towards both poles. If the same flow persists to great depths, it could play an…”
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Time–Distance Helioseismology Data-Analysis Pipeline for Helioseismic and Magnetic Imager Onboard Solar Dynamics Observatory (SDO/HMI) and Its Initial Results by Zhao, J., Couvidat, S., Bogart, R. S., Parchevsky, K. V., Birch, A. C., Duvall, T. L., Beck, J. G., Kosovichev, A. G., Scherrer, P. H.

“…The Helioseismic and Magnetic Imager onboard the Solar Dynamics Observatory (SDO/HMI) provides continuous full-disk observations of solar oscillations. We…”
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Radiative Transfer Effects on Doppler Measurements as Sources of Surface Effects in Sunspot Seismology by Rajaguru, S. P, Sankarasubramanian, K, Wachter, R, Scherrer, P. H

“…We show that the use of Doppler shifts of Zeeman-sensitive spectral lines to observe waves in sunspots is subject to measurement-specific phase shifts arising…”
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A Critical Evaluation of Recent Claims Concerning Solar Rotation by Scherrer, P. H., Gough, D. O.

“…Fossat et al. recently reported detecting rotational splitting of g-modes indirectly via the interaction with p-modes observed directly by the Global…”
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A Note on Saturation Seen in the MDI/SOHO Magnetograms by Liu, Y, Norton, A A, Scherrer, P H

“…A type of saturation is sometimes seen in sunspot umbrae in MDI/SOHO magnetograms. In this paper, we present the underlying cause of such saturation. By using…”
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Prediction and understanding of the north-south displacement of the heliospheric current sheet by Zhao, X. P., Hoeksema, J. T., Scherrer, P. H.

“…On the basis of Wilcox Solar Observatory observations of the photospheric magnetic field and the potential field‐source surface model, we compare the solid…”
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On the Constancy of the Solar Diameter. II by Kuhn, J. R, Bush, R. I, Emilio, M, Scherrer, P. H

“…The Michelson Doppler Imager instrument on board SOHO has operated for most of a solar cycle. Here we present a careful analysis of solar astrometric data…”
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Implementation and Comparison of Acoustic Travel-Time Measurement Procedures for the Solar Dynamics Observatory/Helioseismic and Magnetic Imager Time – Distance Helioseismology Pipeline by Couvidat, S., Zhao, J., Birch, A. C., Kosovichev, A. G., Duvall, T. L., Parchevsky, K., Scherrer, P. H.

“…The Helioseismic and Magnetic Imager (HMI) instrument onboard the Solar Dynamics Observatory (SDO) satellite is designed to produce high-resolution…”
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Analytical Models for Cross-Correlation Signal in Time-Distance Helioseismology by Nigam, R, Kosovichev, A. G, Scherrer, P. H

“…In time-distance helioseismology, the time signals (Doppler shifts) at two points on the solar surface separated by a fixed angular distance are…”
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Detection of High-Latitude Waves of Solar Coronal Activity in Extreme-Ultraviolet Data from the Solar and Heliospheric Observatory EUV Imaging Telescope by Benevolenskaya, E. E, Kosovichev, A. G, Scherrer, P. H

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Asymmetry in Velocity and Intensity Helioseismic Spectra: A Solution to a Long-standing Puzzle by Nigam, R, Kosovichev, A. G, Scherrer, P. H, Schou, J

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The Solar Oscillations Investigation - Michelson Doppler Imager by Scherrer, P. H., Bogart, R. S., Bush, R. I., Hoeksema, J. T., Kosovichev, A. G., Schou, J., Rosenberg, W., Springer, L., Tarbell, T. D., Title, A., Wolfson, C. J., Zayer, I.

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Success rate of predicting the heliospheric magnetic field polarity with Michelson Doppler Imager (MDI) synoptic charts by Zhao, X. P., Hoeksema, J. T., Liu, Y., Scherrer, P. H.

“…The photospheric and heliospheric magnetic fields have been continuously observed at the L1 point by the Michelson Doppler Imager (MDI) on the Solar and…”
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A Method for the Estimation of f- and p-mode Parameters and Rotational Splitting Coefficients from Un-averaged Solar Oscillation Power Spectra by Reiter, J., Rhodes, E. J., Kosovichev, A. G., Scherrer, P. H., Larson, T. P., II, S. F. Pinkerton

“…We present a new methodology for the fitting of the peaks in solar oscillation power spectra that is equally well-suited for the estimation of low-, medium,…”
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