SP-624 October 2006
SOHO 18/GONG 2006/HELAS I Beyond the spherical Sun
7-11 August 2006 Sheffield, UK Scientific Organising Committee
Michael Thompson (Chair) University of Sheffield, UK Bo Andersen Norwegian Space Centre, Norway Annie Baglin Observatoire de Paris-Meudon, France Sarbani Basu Yale University, USA Paul Cally Monash University, Australia Yvonne Elsworth University of Birmingham, UK Bernhard Fleck ESA Space Science Department, USA Douglas Gough University of Cambridge, UK Hans Kjeldsen Aarhus University, Denmark Don Kurtz University of Central Lancashire, UK John Leibacher National Solar Observatory, USA Pere Pallé Instituto de Astrofisica de Canarias, Spain Phil Scherrer Stanford University, USA Hiromoto Shibahashi University of Tokyo, Japan Sylvaine Turck-Chièze Service d’Astrophysique / DAPNIA, France
Local Organising Committee
Michael Thompson (Chair) University of Sheffield Robert Erdélyi University of Sheffield Rekha Jain University of Sheffield Roger New Sheffield Hallam University
Publication: Proceedings, SOHO 18/GONG 2006/HELAS I Beyond the spherical Sun Noordwijk, The Netherlands (ESA SP-624, October 2006) Editor: Karen Fletcher Scientific Editor: Michael Thompson Published and distributed by: ESA Publications Division ESTEC Postbus 299 2200 AG Noordwijk The Netherlands Tel: +31 71 565 3400 Fax: +31 71 565 5433 Printed in: The Netherlands Price: 60 ISBN: 92-9092-935-9 ISSN: 0379-6566 Copyright: © 2006 European Space Agency CONTENTS
Introduction and welcome Chair: B Fleck
Various dynamical puzzle pieces in the seismic Rubik’s cube J Toomre
Session 1 Local methodologies Chair: B Fleck
Local helioseismology: techniques and issues A C Birch
Farside helioseismic holography: recent advances I González Hernández, F Hill, C Lindsey, D Braun, P Scherrer, S M Hanasoge
Magnetoseismic signatures of active regions and the question of rapid downflows beneath sunspots C Lindsey
Observed and simulated photospheric velocities within inclined magnetic fields H Schunker, P Cally
Session 2 Temporal variations and flows Chair: M Roth
Seismic results on temporal variation of the solar interior R Howe
Toward improving the seismic visibility of the solar tachocline S M Jefferies, S V Vorontsov, C Giebink
The seismic Sun over three activity cycles W J Chaplin, Y Elsworth, S J Hale, B A Miller, G A Verner, R New
Cyclic variability of the seismic solar radius from SOHO/MDI and related physics S Lefebvre, A G Kosovichev, P Nghiem, S Turck-Chièze, and J P Rozelot
Interior structures and flows beneath sunspots from time-distance helioseismology J Zhao
Subsurface convective flows within active regions B W Hindman, D A Haber, J Toomre Session 2 (continued) Chair: P Cally
Consequences of large-scale flows around active regions on the dispersal of magnetic field across the solar surface M L DeRosa, C J Schrijver
Effect of the subsurface shear layer on solar supergranulation C A Green, A G Kosovichev, M S Miesch
Effect of sunspot structure from p-modes scattering M Gordovskyy, R Jain, M J Thompson
Session 3 Seismology above the photosphere Chair: P Cally
Magnetic seismology of the lower solar atmosphere R Erdélyi
Low-frequency magneto-acoustic waves in the solar chromosphere S M Jefferies, S W McIntosh, J D Armstrong, T J Bogdan, A Cacciani, B Fleck
Session 4 Modelling the solar interior Chair: R Komm
Reconciling the revised solar abundances with helioseismic constraints J A Guzik
Non-kinematic flux-transport dynamos and torsional oscillations M Rempel
Solar evolution model with diffusion and new equation of state S V Ayukov, V A Baturin, A B Gorshkov
Molecular-dynamics simulations of hot dense Coulomb systems K Mussack, D Mao, W Däppen
Session 5 Low-degree seismology from the Sun to the stars Chair: D O Gough
Helioseismology with low-degree observations: where we stand, and what the future holds W J Chaplin
The internal structure of the Sun inferred from g modes and low-frequency p modes Y P Elsworth et al. Detection of periodic signatures in the solar power spectrum On the track of l=1 gravity modes R A García, S Turck-Chièze, S J Jiménez-Reyes, J Ballot, P L Pallé, A Eff-Darwich, S Mathur, JProvost
The DynaMICS perspective S Turck-Chièze et al.
Observations of solar-like oscillations T Bedding, H Kjeldsen
Rigorous analysis of dipolar oscillations of stars M Takata
Frequency, splitting, linewidth and amplitude estimates of low-l p modes of alpha Cen A: analysis of WIRE photometry S T Fletcher, W J Chaplin, Y Elsworth, J Schou, D Buzasi
Session 6 Mode physics Chair: H Kjeldsen
Stochastic excitation and damping of solar-like oscillations G Houdek
Energetic effects in classical pulsators M-A Dupret, A Grigahcène, S Théado, P-O Bourge, M Gabriel
Session 7 A new era of asteroseismlogy Chair: H Kjeldsen
Studying solar-like oscillations in red giants: MOST spacebased photometry of epsilon Ophiuchi C Barban et al.
Modelling intermediate mass red giants O Moreira, A Noels, M-A Dupret
Session 7 (continued) Chair: S Basu
Asteroseismology of hot B subdwarf stars: a brief overview G Fontaine, P Brassard, S Charpinet, E M Green, P Chayer, S Randall, B Dorman
Observations of magneto-acoustic modes in strongly magnetic pulsating roAp stars D W Kurtz, V G Elkin, G Mathys
The seismology programme of the CoRoT space mission A Baglin, E Michel, M Auvergne, and the CoRoT team Session 8 Dynamics and numerical simulation Chair: F Hill
Asteroseismology of exoplanets-host stars S Vauclair
Dynamical processes in stellar radiation zones: secular magnetohydrodynamics of rotating stars S Mathis, T Decressin, A Palacios, L Siess, C Charbonnel, S Turck-Chièze, J-P Zahn
Internal gravity waves in the Sun S Talon
Dynamical processes in the solar radiative interior A Palacios, S Talon, S Turck-Chièze, C Charbonnel
Suppression of amplitude of 5-min oscillations in sunspots due to the lack of acoustic sources K Parchevsky, A Kosovichev
Solar acoustic simulator S M Hanasoge, T L Duvall
Prospects for helio- and asteroseismology J Christensen-Dalsgaard Poster Papers
P1 Optimal phase-speed filters in time-distance helioseismology S Couvidat, A C Birch
P2 Sensitivity kernels for helioseismic travel times in spherical geometry – preliminary results M Roth, L Gizon, A C Birch
P3 Acoustic scattering by flux tubes: is the Born approximation valid? L Gizon, S M Hanasoge, A C Birch
P4 Large-scale circulations using ring analysis D Haber, B Hindman, J Toomre, R S Bogart
P6 The group velocity of solar p modes S V Vorontsov
P8 Temporal variations of travel-time differences from GONG++ S Kholikov, J Leibacher
P10 Correcting Dopplergrams for solar active regions: consequences for local helioseismology R Wachter, S P Rajaguru, R S Bogart
P11 Effects of horizontal magnetic fields on acoustic travel-times R Jain P12 Dynamics study of solar oscillations and granulation with THÉMIS observations R Simoniello, S J Jiménez Reyes
P13 Inferring subsurface supergranular flow directly from helioseismic correlation data M F Woodard
P14 f-mode sensitivity kernels for flows J Jackiewicz, L Gizon, A Birch
P15 Subsurface flows measured with big rings R Komm, I González Hernández, R Howe, F Hill
P16 Subsurface flows from numerical simulations compared with flows from ring analysis S Ustyugov, R Komm, O Burtseva, R Howe, S Kholikov
P18 B0-angle effect on zonal and meridional flow determinations from 3 years ring diagram analysis of GONG++ data A Zaatri, R Komm, I González Hernández, R Howe, T Corbard
P22 Solar rotation and zonal flows from Mount Wilson 60 ft tower data R Howe, R Bogart, J Christensen-Dalsgaard, E J Rhodes Jr, P Rose, J Schou
P23 Meridional flow measurements with statistical waveform analysis U Mitra-Kraev, M J Thompson, M F Woodard
P24 Examining possible errors in the inversion results of active regions through a model study C-H Lin, L Li, S Basu
P25 Acoustic power and magnetic field orientation in a large sunspot S Gosain, P Venkatakrishnan, K Venugopalan
P26 The cookie cutter test for time-distance tomography of active regions S G Korzennik
P27 Comparative study of isolated sunspots using time-distance helioseismology S Zharkov, C J Nicholas, M J Thompson
P28 Subsurface structure evolution associated with the rise and fall of intensely active regions R S Bogart, S Basu, M C Rabello-Soares, H M Antia
P29 Three-dimensional numerical simulation of wave propagation through a model sunspot R Cameron, L Gizon
P30 Magnetic field inclination and atmospheric oscillations above solar active regions: theory P S Cally, H Schunker
P31 On the enhanced velocity oscillations observed during solar flares B Kumar, P Venkatakrishnan, K Venugopalan
P33 The acoustically active solar flare of 2005 January 15 H Moradi, A-C Donea, C Lindsey, D Besliu-Ionescu, P S Cally P34 Seismic emission from M-class solar flares D Besliu-Ionescu, A-C Donea, P Cally, C Lindsey
P35 Peak parameter shifts from large-aperture ring diagram analysis R Howe, I González Hernández, F Hill, R Komm
P36 Phenomenological simulation of the total solar irradiance and its power spectrum H Vázquez Ramió, C Régulo, T Roca Cortés
P37 Solar mean magnetic field near the surface and its variation during a cycle P A P Nghiem, R A García, S J Jiménez-Reyes
P38 High-degree mode frequencies: changes with solar cycle M C Rabello-Soares, S G Korzennik, J Schou
P39 Helioseismic modes in a magnetic atmospheric solar model B Pintér, R Erdélyi
P40 Hydrodynamic evolution of the solar tachocline S Talon
P41 How magnetic is the solar tachocline? R Arlt, A Sule, G Rüdiger
P42 MHD turbulence on a ß-plane N Leprovost, E-J Kim
P43 Turbulent transport in the solar interior E-J Kim, N Leprovost
P44 Convection and non-axisymmetric large-scale flows at the base of the solar convection zone E Tikhomolov
P45 A non-local MLT treatment fitting 3D simulations M-A Dupret, M-J Goupil, R Samadi, A Grigahcène, M Gabriel
P46 Supergranule scale convection simulations R F Stein, D Benson, D Georgobiani, Å Nordlund
P47 Seismic estimate of solar heavy element abundances S Basu, H M Antia
P48 A seismic solar model with the updated elemental abundances H Shibahashi, S Tamura
P49 Rotation inversions of artificial solarFLAG Sun-as-a-star data W J Chaplin et al.
P50 Coupling of high-degree solar p modes by differential rotation S V Vorontsov P51 On the direct determination of sensitivity, resolution and information content of helioseismic data – application to the inversion of the solar core rotation rate A Eff-Darwich, S G Korzennik, S J Jiménez-Reyes, R A García
P52 Evolutionary convective envelope in modern model of the Sun V A Baturin
P53 A new method to estimate the acoustic cut-off frequency of the Sun using the different properties between p-modes and pseudomodes of low degree A Jiménez, S J Jiménez-Reyes, R A García
P54 Examining the effect of the new chemical composition on solar structure by using the adiabatic index C-H Lin, H M Antia, S Basu
P55 On seismic signatures of rapid variation G Houdek, D O Gough
P56 How GOLF sees the second helium ionization layer across the solar cycle J Ballot, S J Jiménez-Reyes, R A García
P57 Solar-cycle variations in p-mode frequencies and even-order splitting coefficients from LOWL observations D Salabert, S J Jiménez-Reyes
P58 Are the shapes of the p-mode peaks ‘distorted’ by the solar cycle when they are observed in long, multi-year power frequency spectra? W J Chaplin, Y Elsworth, R New, T Toutain
P59 How does the change on solar abundances affect low degree modes? A Zaatri, J Provost, G Berthomieu, P Morel, T Corbard
P61 Changes to global mode parameters over a solar cycle S C Tripathy, F Hill, K Jain, J W Leibacher
P62 Comparison of the solar velocity spectrum from MDI and GOLF during cycle 23 S Lefebvre, R A García, S J Jiménez-Reyes, S Turck-Chièze
P63 Sensitivity of the predicted frequencies of l = 1 gravity modes to known physical processes S Mathur, S Turck-Chièze, S Couvidat, R A Garcia
P64 Needles in haystacks: how to use contemporaneous data in the search for g-modes A M Broomhall, W J Chaplin, Y Elsworth
P65 Theoretical damping rates and phase-lags for solar-like oscillations M A Dupret, C Barban, M-J Goupil, R Samadi, A Grigahcène, M Gabriel
P66 Solar-activity changes in the p-mode damping and excitation observed in LOWL data D Salabert, S J Jiménez-Reyes P68 BiSON update J Allison et al.
P69 Analysis of velocity-noise variations arising from photon-noise in data from the GOLF instrument R New, W J Chaplin, Y P Elsworth, R A García, S J Jiménez-Reyes
P70 Reliable analysis of power and phase features as seen from BiSON and GOLF observations R Simoniello, Y P Elsworth, W J Chaplin, R García
P71 Comparison of solar p-mode lifetimes from GONG, MDI and TON data O Burtseva, S Kholikov, F Hill, J Bolding, O Ladenkov, D-Y Chou
P72 A comparison of acoustic mode parameters using multi-spectral data K Jain et al.
P73 Comparison of local frequency shifts between MDI velocity and intensity data S C Tripathy, H M Antia, F Hill, K Jain, I González Hernández et al.
P75 High resolution spectrum: towards a new observational strategy N Seghouani
P76 Study of the role of phase evolution in the amplitudes of low-degree solar p-modes R Simoniello, W J Chaplin, Y Elsworth, R New
P78 The effects of rotation on frequency of stellar oscillations K D Burke, M J Thompson
P79 On the possible existence of localised vacillating convection state in rapidly rotating young solar- like stars J Ballot, A S Brun, S Turck-Chièze
P80 Asteroseismic diagnostics of stellar convective cores A Mazumdar, S Basu, B L Collier, P Demarque
P81 Kepler telescope and solar-like pulsators J Molenda-Zakowicz, T Arentoft, H Kjeldsen, A Bonanno
P82 Calibrating the solar dynamo: magnetic activity cycles of southern Sun-like stars T S Metcalfe, T J Henry, M Knölker, D R Soderblom
P83 On the prospects for sounding activity cycles on Sun-like stars W J Chaplin, Y Elsworth, G Houdek, R New
P84 Evidence for degree dependence of changes in p-mode damping along the solar cycle in Sun-as-a- star data D Salabert, W J Chaplin, Y Elsworth, R New, G A Verner
P85 The complementary roles of interferometry and asteroseismology O L Creevey, M J P F G Monteiro, T S Metcalfe, T M Brown
P86 12 Bootis: the need for asteroseismic constraints A Miglio, J Montalbán, C Maceroni, J De Ridder, F D’Antona P87 Procyon-A and Bootis: observational frequencies analyzed by the local-wave formalism P A P Nghiem, J Ballot, R A García, P Lambert, S Turck-Chièze
P89 A line profile analysis of the pulsating red giant star Ophiuchi (G9.5III) S Hekker, C Aerts, J De Ridder, F Carrier
P90 Asteroseismology of K giants M P Di Mauro et al.
P91 Pulsational properties of the Cephei star SY Equ from combined photometric and spectroscopic observations J Daszynska-Daszkiewicz, A Pigulski
P92 Chemical composition of the pulsating Cephei star Peg E Niemczura, G Polubek
P93 SIAMOIS: an asteroseismic network with 1 site… in Antarctica M Benoît and the SIAMOIS team
P95 The spectral resolving power of irregularly sampled time series F Pijpers
P97 Helioseismology of sub-photospheric flows S Shelyag, R Erdélyi, M J Thompson
P101 Forward modeling of atmospheric magneto-acoustic-gravity waves J D Armstrong
P102 The parameters of seismic sources in the flare of 28 October 2003 V V Zharkova, S I Zharkov
P103 g-mode search and the solar cycle A Gabriel
P104 Does the inference of solar subsurface flow change with choice of the spectral line? K Jain, F Hill, I González Hernández, C G Toner, S C Tripathy, J D Armstrong, S M Jefferies
P105 Temporal variations of solar rotation during solar cycle 23 S Basu, H M Antia
P106 Time-varying component of the solar meridional flow L Gizon, M Rempel
P109 European helio- and asteroseismology network – HELAS M Roth et al.
P110 Propagation of p-modes into the solar atmosphere* Y Taroyan, R Erdélyi, C Malins
* Please note this paper is not listed in the contents of the Proceedings, but the paper is present on the CD. Late papers
The pulsations and potential for seismology of B stars C Aerts
Distribution of MDI p-mode power correlation coefficients H Y Chang, T Sekii
Helioseismic probing of giant-cell convection N A Featherstone, D A Haber, B W Hindman, J Toomre
Sunquake sources and wave propagation A G Kosovichev