GONG Helioseismology;
Articles
Differential Rotation and Dynamics of the Solar Interior
M. J. Thompson,
J. Toomre, E. R. Anderson,
H. M. Antia,
G. Berthomieu, D. Burtonclay,
S. M. Chitre,
J. Christensen-Dalsgaard, T. Corbard,
M. DeRosa,
C. R. Genovese, D. O. Gough,
D. A. Haber,
J. W. Harvey, F. Hill,
R. Howe,
S. G. Korzennik, A. G. Kosovichev,
J. W. Leibacher,
F. P. Pijpers, J. Provost,
E. J. Rhodes Jr.,
J. Schou, T. Sekii,
P. B. Stark,
P. R. Wilson
Splitting of the sun's global oscillation frequencies by large-scale
flows can be used to investigate how rotation varies with radius and latitude
within the solar interior. The nearly uninterrupted observations by the
Global Oscillation Network Group (GONG) yield oscillation power spectra
with high duty cycles and high signal-to-noise ratios. Frequency splittings
derived from GONG observations confirm that the variation of rotation rate
with latitude seen at the surface carries through much of the convection
zone, at the base of which is an adjustment layer leading to latitudinally
independent rotation at greater depths. A distinctive shear layer just
below the surface is discernible at low to mid-latitudes.
M. J. Thompson and R. Howe
are in the Astronomy Unit, Queen Mary and Westfield College, University
of London, Mile End Road, London E1 4NS, UK. J. Toomre, M. DeRosa,
and D. A. Haber are at JILA, University of Colorado, Boulder,
CO 80309-0440, USA. E. R. Anderson, J. W. Harvey, F. Hill,
and J. W. Leibacher are at the National Solar Observatory (NSO),
National Optical Astronomy Observatories (NOAO), Post Office Box 26732, Tucson,
AZ 85726-6732, USA. H. M. Antia and S. M. Chitre are
at the Tata Institute of Fundamental Research, Bombay 400005, India.
G. Berthomieu, T. Corbard, and J. Provost are at the Observatoire
de la Cote d'Azur, 06304 Nice Cedex 4, France. D. Burtonclay
and P. R. Wilson are in the School of Mathematics, University
of Sydney, Sydney, NSW 2006, Australia. J. Christensen-Dalsgaard
and F. P. Pijpers are at the Theoretical Astrophysics Center,
Aarhus University, DK-8000 Aarhus C, Denmark. C. R. Genovese
is in the Department of Statistics, Carnegie Mellon University, Pittsburgh,
PA 15213, USA. D. O. Gough and T. Sekii are in the
Institute of Astronomy, University of Cambridge, Cambridge CB3 0HA, UK.
S. G. Korzennik is at the Harvard-Smithsonian Center for Astrophysics,
60 Garden Street, Cambridge, MA 02138, USA. A. G. Kosovichev
and J. Schou are at Hansen Experimental Physics Laboratory Annex,
Stanford University, Stanford, CA 94305-4085, USA. E. J. Rhodes
Jr. is in the Department of Physics and Astronomy, University of Southern
California, Los Angeles, CA 90089, USA. P. B. Stark is in
the Department of Statistics, University of California, Berkeley, CA 94720-3860,
USA.