Title: Solar-Stellar Dynamos as Revealed by Helio- and Asteroseismology: GONG 2008/SOHO 21
Volume: 416 Year: 2009 View Volume 416 on ADS
Editors: Dikpati, M.; Arentoft, T.; González Hernández, I.; Lindsey, C.; Hill, F.
These proceedings report the latest progress in the fields of helio- and asteroseismology, which use sound waves to probe the interior of stars. Every two years, researchers in these fields convene under the auspices of the Global Oscillation Network Group (GONG) and the Solar and Heliospheric Observatory (SOHO) programs.

This volume contains a total of 102 papers contributed by 107 participants. The proceedings of previous GONG meetings have been published as ASPCS volumes 42 and 76. The focus of this meeting was on what seismology could reveal about the dynamo mechanism underlying solar and stellar activity. The topical sessions included Local Helioseismology; Global Helioseismology; Asteroseismology; Solar Activity: Convection, Tachocline, Dynamo, and Data Assimilation; and Major Observational Programs.

The current solar activity minimum has been unusually deep and lengthy, reminding us how poorly we understand the mechanism underlying stellar activity. Seismology is the only way we can penetrate the surface of a star and probe its interior. Future observational programs, such as the Solar Dynamics Observatory, Kepler, and Picard, along with the current efforts of GONG, SOHO, and CoRoT, promise to provide clues to one of the deepest mysteries of the universe: the properties of the interiors of stars.
ISBN: 978-1-58381-712-4 eISBN: 978-1-58381-713-1
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Paper Title Page Authors
Front matter   
Volume Cover Dikpati, M.; Arentoft, T.; González Hernández, I.; Lindsey, C.; Hill, F.
Front matter 1 Dikpati, M.; Arentoft, T.; González Hernández, I.; Lindsey, C.; Hill, F.
Conference Photograph 1 Dikpati, M.; Arentoft, T.; González Hernández, I.; Lindsey, C.; Hill, F.
Part 1. Keynote Address   
Seismology and the Dynamo: History and Prospects 3 Cally, P. S.
Part 2. Local Helioseismology   
Helioseismic Measurement of Large-Scale Solar Flows 15 Woodard, M. F.
Time-Distance Helioseismic Imaging of a Numerically Simulated Solar Tachocline 25 Zhao, J.; Hartlep, T.; Kosovichev, A. G.; Mansour N. N.
Simulations of Waves in Sunspots 31 Khomenko, E.
New Results of High-Resolution Helioseismology from Hinode 41 Kosovichev, A. G.; Zhao, J.; Sekii, T.; Nagashima, K.; Mitra-Kraev, U.
Numerical Simulations of Quiet Sun Oscillations 49 Schunker, H.; Cameron, R.; Gizon, L.
Absorption of p Modes by Magnetic Plage 55 Jain, R.; Hindman, B. W.; Braun, D. C.; Birch, A. C.
Excitation, Propagation and Conversion of Helioseismic MHD Waves in Strong Field Regions 61 Parchevsky, K. V.; Kosovichev, A. G.
Realistic MHD Simulations of Solar Convection and Oscillations in Magnetic Regions: Mode Excitation and Effects of Acoustic Halos 67 Jacoutot, L.; Kosovichev, A. G.; Wray, A.; Mansour, N.
Analysis of Acoustic Wave Propagation in the Subphotosphere with Localized Magnetic Field Concentration 75 Zharkov, S.; Shelyag, S.; Thompson, M. J.
Magnetoseismic Study of the Active Region AR10720 81 Martínez-Oliveros, J. C.; Donea, A.-C.
Improving the Prediction Capability of Seismic Far-Side Maps 87 González Hernández, I.; Scherrer, P.; Hill, F.; Lindsey, C.; Braun, D.
Time-Distance Envelope Widths: What Can They Tell Us? 93 Armstrong, J. D.
The Solar Subsurface Radial Gradient of Angular Velocity as Revealed by Ring Diagram Analysis 99 Zaatri, A.; Corbard, T.
Measuring Meridional Circulation in the Sun 103 Duvall, T. L. Jr.; Hanasoge, S. M.
New Multiple-Ridge Ring Analysis 111 Haber, D. A.
Temporal Variation of Subsurface Flows of Active Regions 115 Komm, R.; Howe, R.; Hill, F.
The Evolution of the Sub-Surface Structure of Long-Lived Active Regions 119 Baldner, C. S.; Bogart, R. S.; Basu, S.; Antia, H. M.
Subsurface Zonal Flows of Active and Quiet Regions 123 Komm, R.; Howe, R.; Hill, F.; González Hernández, I.
Subsurface Flow Properties of Flaring Versus Flare-Quiet Active Regions 127 Ferguson, R.; Komm, R.; Hill, F.; Barnes, G.; Leka K. D.
How Much Data Do We Need to Detect the Deep Solar Meridional Circulation? 131 Braun, D. C.; Birch, A. C.
Travel-Time Errors Due To Data Gaps 135 Beck, J. G.; Duvall, T. L. Jr.; Zhao, J.
Does the Selection of a Quiet Region Influence the Local Helioseismic Inferences? 139 Tripathy, S. C.; Antia, H. M.; Jain, K.; Hill, F.
Investigating The Role of Strong Magnetic Fields on Helioseismic Wave Propagation 143 Moradi, H.; Hanasoge, S. M.; Cally, P. S.
Signatures of Emerging Subsurface Structures in Acoustic Power Maps 147 Hartlep, T.; Kosovichev, A. G.; Zhao, J.; Mansour, N. N.
Ring Diagram Analysis of an Artificial 96 × 96 × 20 Mm Data Set 151 Howe, R.; González Hernández, I.; Komm, R.; Hill, F.
Can Sunspot Moats Tell Us β for the SolarDynamo? 155 Lindsey, C.
A Different Approach to Calculate the Far-Side Seismic Migration 159 Pérez Hernández, F.; González Hernández, I.
Time-Distance Solar Far-Side Imaging Using Three-Skip Acoustic Signals 163 Ilonidis, S.; Zhao, J.; Hartlep, T.
Numerical Simulation of Acoustic Wave Propagation in the Solar Sub-Photosphere with Localized Magnetic Field Concentration 167 Shelyag, S.; Zharkov, S.; Fedun, V.; Erdélyi, R.; Thompson, M. J.
Part 3. Global Helioseismology   
Magnetic Fields and Temporal Variation 173 Howe, R.
Are Low-Degree p-Mode Frequencies Predictable from one Cycle to the Next? 183 Broomhall, A.-M.; Chaplin, W. J.; Elsworth, Y.; New, R.; Verner, G. A.
Correlation Analysis of Mode Frequencies with Activity Proxies at Different Phases of the Solar Cycle 189 Jain, K.; Tripathy, S. C.; Hill, F.
The Solar Metallicity Problem: What is the Solution? 193 Basu, S.
Measuring Solar Abundances with Seismology 203 Mussack, K.; Gough, D.
GOLF: Analysis of the Low Frequency Spectrum and Comparison with a Calculated Solar g-Mode Spectrum 209 Grec, G.; Provost, J.; Renaud, C.
What Can We Learn on the Structure and the Dynamics of the Solar Core with g Modes? 215 Mathur, S.; Eff-Darwich, A.; García, R. A.; Jiménez-Reyes, S. J.; Korzennik, S. G.; Turck-Chièze, S.
On the Dependence of our Inferences about the Solar Internal Rotation on the Frequency Fitting Methodology 221 Korzennik, S. G.; Eff-Darwich, A.
BiSON Update 227 Allison, J.; Barnes, I.; Broomhall, A.-M.; Chaplin, W.; Davies, G.; Elsworth, Y.; Hale, S.; Jackson, B.; Miller, B.
On Flare-Driven Global Waves 233 Karoff, C.
Post-hoc Derivation of MDI Flat Fields 239 Potts, H. E.; Diver, D. A.
The Inhomogeneous Response Across the Solar Disc of Unresolved Doppler Velocity Observations 245 Broomhall, A.-M.; Chaplin, W. J.; Elsworth, Y.; New, R.
Exploring Changes in Solar Model Physics to Mitigate the Solar Abundance Problem 249 Guzik, J. A.
Impact of Low-Frequency p Modes on the Inversions of the Internal Rotation of the Sun 253 Salabert, D.; Eff-Darwich, A.; Howe, R.; Korzennik, S. G.
Time-Frequency Analysis of Global Solar Oscillation Time Series 257 Schad, A.; Roth, M.; Timmer, J.
What is New with Zonal Flows? 265 Antia, H. M.; Basu, S.; Chitre, S. M.
The Torsional Oscillation and the Solar Cycle: Is it Minimum Yet? 269 Howe, R.; Komm, R.; Hill, F.; Larson, T.; Schou, J.; Thompson, M. J.; Ulrich, R. K.
Sensitivity of p Modes for Constraining Velocities of Microscopic Diffusion of the Elements 273 Creevey, O. L.; Mathur, S.; García R.
Search for Structural Variations of the Near-Surface Layers of the Sun during the Solar Cycle 277 Rabello-Soares, M. C.; Korzennik, S. G.
Variation in p-Mode Power over Solar Cycle 23 as seen from BiSON and GOLF Observations 281 Simoniello, R.; Salabert, D.; García, R. A.
Variation of Oscillation Mode Parameters over Solar Cycle 23: An Analysis on Different Time Scales 285 Tripathy, S. C.; Hill, F.; Jain, K.; Leibacher, J. W.
Changing Magnetic Fields in the Solar Interior 289 Baldner, C. S.; H. M.; Basu, S.; Larson, T. P.
Amplitudes of High-Degree p Modes in the Quiet and Active Sun 293 O. Burtseva, O.; Tripathy, S. C.; Hill, F.; Kholikov, S.; Raouafi, N.-E.; Lindsey, C.
Spatial Cross Spectrum: Reducing Incoherent Convective Background of Resolved Helioseismic Instruments 297 García, R. A.; Mathur, S.; González Hernández, I.; Jiménez, A.
Toward Eliminating Systematic Errors in Intermediate-Degree p-Mode Measurements 301 Vorontsov, S. V.; Jefferies, S. M.; Giebink, C.; Schou, J.
On the Solar Origin of the 220.7 µHz Signal 307 Jiménez, A.; García, R. A.
Variations in Global Mode Analysis 311 Larson, T.; Schou, J.
Results from Fitting Long and Very-Long MDI Time-Series at Low and Intermediate Degrees 315 Korzennik, S. G.
Calculation of Solar p-Mode Oscillation Frequency Splittings Based on a Two-Dimensional Solar Model 321 Li, L.; Basu, S.; Sofia, S.; Demarque, P.
Analysis of GOLF Power Spectra Weighted to Account for Noise Variations Through the Data Set 325 New, R.; Fletcher, S.; Chaplin, W.; Elsworth, Y.; García, R. A.
Low-Frequency Solar p Modes as Seen by the GOLF and GONG Instruments 329 Salabert, D.; García, R. A.
Evidence of Enhanced High Frequency Velocity Oscillations in the Sun Observed During Solar Flares Using Disk-Integrated Doppler Signals 333 Kumar, B.; Venkatakrishnan, P.
The Simulation of Realistic BiSON-like Helioseismic Data 337 Fletcher, S.; New, R.; Broomhall, A.-M.; Chaplin, W.; Elsworth, Y.
First Performance of the GOLF-NG Instrumental Prototype Observing the Sun in Tenerife 341 Salabert, D.; Turck-Chièze, S.; Barrière, J. C.; Carton, P. H.; Daniel-Thomas, P.; Delbart, A.; García, R. A.; Granelli, R.; Jiménez-Reyes, S. J.; Lahonde-Hamdoun, C.; Loiseau, D.; Mathur, S.; Nunio, F.; Pallé, P. L.; Piret, Y.; Robillot, J. M.; Simoniello, R.
Part 4. Asteroseismology   
Optimizing Weights for the Detection of Stellar Oscillations: Application to α Centauri A and B, and β Hydri 347 Arentoft, T.; Kjeldsen, H.; Bedding, T. R.
Comparing Properties of Convection in the Surface Layers of Stars With Different Masses and Evolutionary States 357 Robinson, F.; Tanner, J.; Basu, S.; Demarque, P.
Testing the Potential and Limitations of Seismic Data 363 Creevey, O. L.
Dynamo Action and Wreaths of Magnetism in a Younger Sun 369 Brown, B. P.; Browning, M. K.; Brun, A. S.; Miesch, M. S.; Toomre, J.
The Activity Cycles and Surface Differential Rotation of Single Dwarfs 375 Saar, S. H.
Differential Rotation in Stars: Expectations and Asteroseismic Diagnostics 385 Kawaler, S. D.
Pulsation Modes with High Azimuthal Orders in Stellar Models Based on the Self-Consistent Field Method 395 Reese, D. R.; MacGregor, K. B.; Jackson, S.; Skumanich, A.; Metcalfe, T. S.
Discovery of New Hot Pulsators in the CoRoT Exoplanet Database and Their Potential for Asteroseismology 401 Aerts, C.; Debosscher, J.; Sarro, L.; Degroote, P.; Neiner, C.; Maceroni, C.; Ribas, I.; Auvergne, M.; Deleuil, M.; Ollivier, M.; Jorda, L.; Samadi, R.
Asteroseismic Age and Radius of Kepler stars 407 Creevey, O. L.
Iterative Inversion for Solar and Stellar Internal Rotation 411 Sudnik M.; Thompson, M. J.
Asteroseismic Tests of Heavy Element Diffusion in Low-Mass Stars 415 Gai, N.; Bi, S. L.; Tang, Y. K.
Part 5. Solar Activity: Convection, Tachocline, Dynamo, and Data Assimilation   
Supergranulation-Scale Convection Simulations 421 Stein, R. F.; Nordlund, Å.; Georgoviani, D.; Benson, D.; Schaffenberger, W.
Realistic Magnetohydrodynamical Simulations of Local Solar Supergranulation 427 Ustyugov, S. D.
From Fibril to Diffuse Fields During Dynamo Saturation 433 Brandenburg, A.
Three-Dimensional Simulations of Solar and Stellar Dynamos: The Influence of a Tachocline 443 Miesch, M. S.; Browning, M. K.; Brun, A. S.; Toomre, J.; Brown, B. P.
Exploring Turbulent Effects in Babcock-Leighton Solar Dynamo Models 453 Guerrero, G.; de Gouveia Dal Pino, E. M.; Dikpati, M.
Radiative-MHD Simulations of Sunspot Structure 461 Rempel, M.
Instabilities in the Magnetic Tachocline 467 Arlt, R.
Solar-Cycle Related Changes at the Base of the Convection Zone 477 Baldner, C. S.; Larson, T. P.; Basu, S.
On the Long-Term Cyclic Period of North-South Asymmetry of Solar Active Region Phenomena 483 Verma, V. K.
Modeling the Subsurface Evolution of Active-Region Flux Tubes 489 Fan, Y.
The Advection of Supergranules by Large-Scale Flows 495 Hathaway, D. H.; Williams, P. E.; Cuntz, M.
Data Assimilation and Helio- & Asteroseismology 501 Roth, M.
Implementation of Data Assimilation Methods for Dynamo Models to Predict Solar Activity 511 Kitiashvili I.; Kosovichev, A.
Pseudo-Global Fitting of Gapped Helioseismic Data 519 Fletcher, S.; New, R.; Chaplin, W.; Elsworth, Y.
Axisymmetric MHD Instabilities in Solar/Stellar Tachoclines 525 Dikpati, M.; Cally, P. S.; Gilman, P. A.; Miesch, M. S.
GOLF: A New Proxy for Solar Magnetism 529 Mathur, S.; Jiménez-Reyes, S. J.; García, R. A.
Applying Fourier and Variable Sine Algorithmic Analysis to Solar Data 533 Reindel, A.; Bradley, P. A.; Tsantilas, S.; Guzik, J. A.
An Investigation of Solar Magnetic Indices for Space Weather Forecasting 537 Brockman, A.; Giersch, O.; Kennewell, J.
Using Solar Regions as Seen by Hinode XRT to Model the Coronae of Inactive Stars and Magnetic Minima 543 Saar, S.; Testa, P.; Weber, M.; Marsh, J.
Transport of Supergranules and their Vertical Coherence 547 Švanda, M.; Kosovichev, A. G.; Klvana, M.; Sobotka, M.; Duvall, T. L., Jr.
Group Discussion: Solar Activity: The Role of Convection, the Tachocline and the Dynamo and Applications of Data Assimilation 551 Rempel, M.; Dikpati, M.
Part 6. Major Observational Programs   
The Future of Helioseismology 557 Hill, F.
Asteroseismology and the Solar-Stellar Connection 567 Metcalfe, T. S.
PLATO: PLAnetary Transits and Oscillations of Stars 577 Arentoft, T.; ESA PLATO Science Study team
The Stellar Observations Network Group—the Prototype 579 Grundahl, F.; Christensen-Dalsgaard, J.; Kjeldsen, H.; Jørgensen, U. G.; Arentoft, T.; Frandsen, S.; Kjærgaard, P.
BRITE-Constellation 587 Kuschnig, R.; Weiss, W. W.; Moffat, A.; Kudelka, O.
SIAMOIS: Seismic Interferometer to Measure Oscillations in the Interiors of Stars 591 Mosser B.; the SIAMOIS Team
Back matter   
Indexes 593 Dikpati, M.; Arentoft, T.; González Hernández, I.; Lindsey, C.; Hill, F.
Back matter 598