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Article
Divergence and Vorticity of Subsurface Flows During Solar Cycles 23 and 24
We study the solar-cycle variation of the divergence and vorticity of subsurface horizontal flows from the surface to a depth of 16 Mm. The flows were derived with ring-diagram analysis applied to Michelson Doppl...
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Article
Solar-Cycle Variation of the Subsurface Flows of Active- and Quiet-Region Subsets
We study the solar-cycle variation of subsurface flows for both active and quiet solar regions. We derive flows from the surface to a depth of 16 Mm using ring-diagram analysis applied to Dopplergrams obtained...
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Chapter and Conference Paper
Study of Acoustic Halos in NOAA Active Region 12683
We characterize the spatio-temporal power distribution around the active region 12683 as a function of height in the solar atmosphere, wave frequencies, magnetic field strength and inclination of the magnetic ...
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Chapter and Conference Paper
A Comparison of Global Helioseismic-Instrument Performances: Solar-SONG, GOLF and VIRGO
The SONG spectrograph has recently demonstrated its ability to perform solar radial velocity measurement during the first test run of the Solar-SONG initiative. A preliminary assessment of its performance is c...
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Article
Subsurface Zonal and Meridional Flow During Cycles 23 and 24
We study the solar-cycle variation of subsurface flows from the surface to a depth of 16 Mm. We have used ring-diagram analysis to analyze Dopplergrams obtained with the Michelson Doppler Imager (MDI) Dynamics Pr...
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Article
Appendiceal Duplication: A Comprehensive Review of Published Cases and Clinical Recommendations
Duplex appendix is very rare (incidence 0.004%) but has clinical relevance given the frequency of appendicectomies performed. Failure to recognise duplication can result in failure of treatment and medico-lega...
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Article
Solar-Cycle Variation of Subsurface-Flow Divergence: A Proxy of Magnetic Activity?
We study the solar-cycle variation of subsurface flows from the surface to a depth of 16 Mm. We have analyzed Global Oscillation Network Group (GONG) Dopplergrams with a ring-diagram analysis covering about 15 ye...
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Article
Solar-Cycle Variation of Subsurface Meridional Flow Derived with Ring-Diagram Analysis
We study the solar-cycle variation of the meridional flow in the near-surface layers of the solar convection zone from the surface to a depth of 16 Mm. We have analyzed Global Oscillation Network Group (GONG) Dop...
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Article
Subsurface Zonal and Meridional Flow Derived from GONG and SDO/HMI: A Comparison of Systematics
We study the subsurface flows in the near-surface layers of the solar convection zone from the surface to a depth of 16 Mm derived from Global Oscillation Network Group (GONG) and Helioseismic and Magnetic Imager
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Article
Comparative investigation of NbN and Nb-Si-N films: Experiment and theory
NbN and Nb-Si-N films have been deposited by magnetron sputtering of the Nb and Si targets on silicon wafers at various powers supplied to the Nb target. The films have been investigated by an atomic force mic...
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Article
Solar-Cycle Variation of Subsurface Zonal Flow
We study the solar-cycle variation of the zonal flow in the near-surface layers of the solar convection zone from the surface to a depth of 16 Mm covering the period from mid-2001 to mid-2013 or from the maxim...
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Article
Meridional-Flow Measurements from Global Oscillation Network Group Data
We present measurements of the solar meridional flow using time-distance analysis based on Global Oscillation Network Group (GONG) data. In an attempt to detect the deep equatorward flow, which is believed to be ...
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Article
A Full-Sun Magnetic Index from Helioseismology Inferences
Solar magnetic indices are used to model the solar irradiance and ultimately to forecast it. However, the observation of such indices is generally limited to the Earth-facing hemisphere of the Sun. Seismic map...
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Chapter
A Full-Sun Magnetic Index from Helioseismology Inferences
Solar magnetic indices are used to model the solar irradiance and ultimately to forecast it. However, the observation of such indices is generally limited to the Earth-facing hemisphere of the Sun. Seismic map...
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Chapter
Latest Results Found with Ring-Diagram Analysis
Ring-diagram analysis is a helioseismic tool useful for studying the near-surface layers of the Sun. It has been employed to study near-surface shear, meridional circulation, flows around sunspots, and thermal...
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Chapter
Subsurface Meridional Flow from HMI Using the Ring-Diagram Pipeline
We have determined the meridional flows in subsurface layers for 18 Carrington rotations (CR 2097 to 2114) analyzing high-resolution Dopplergrams obtained with the Helioseismic and Magnetic Imager (HMI) instrumen...
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Article
Latest Results Found with Ring-Diagram Analysis
Ring-diagram analysis is a helioseismic tool useful for studying the near-surface layers of the Sun. It has been employed to study near-surface shear, meridional circulation, flows around sunspots, and thermal...
-
Article
Subsurface Meridional Flow from HMI Using the Ring-Diagram Pipeline
We have determined the meridional flows in subsurface layers for 18 Carrington rotations (CR 2097 to 2114) analyzing high-resolution Dopplergrams obtained with the Helioseismic and Magnetic Imager (HMI) instrumen...
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Article
Acoustic Mode Frequencies of the Sun During the Minimum Phase Between Solar Cycles 23 and 24
We investigate the spatial and temporal variations of the high-degree mode frequencies calculated over localized regions of the Sun during the extended minimum phase between solar cycles 23 and 24. The frequen...
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Article
No Evidence Supporting Flare-Driven High-Frequency Global Oscillations
The underlying physics that generates the excitations in the global low-frequency (< 5.3 mHz) solar acoustic power spectrum is a well-known process that is attributed to solar convection; however, a definitive...
