Name:  Thomas L. Duvall, Jr.

Education:  Institution            Degree       Year Confirmed

      Johns Hopkins University      B.A.            1972

      Stanford University           Ph.D.           1978

Professional Experience:

1977-1979  Kitt Peak National Observatory

      Position:  Postdoctoral Fellow

1979-present  Laboratory for Astronomy and Solar Physics

      NASA/Goddard Space Flight Center

      Position:  Astrophysicist

Professional Highlights:

NSF Antarctic Service Medal, 1982

NASA/NSO/Bartol Antarctic expeditions (1981-2, 1987, 1988, 1990, 1994-5)

NASA Exceptional Scientific Achievement Medal, 1990

Mount Duvall named by US Board on Geographic Names at 78S22,162E31, 1996

NSO User's Committee, 1997-2000.

Cochair of the NASA Sun-Earth Connection Roadmap Team, 2002

Selected publications:

"On the Relationship between the Rotational Velocity and the

Field Strength of Solar Magnetic Elements", J. Zhao, A. G. Kosovichev,

and T. L. Duvall Jr., Ap. J. Letters, 607, L135-L138, 2004.

"Wave-like Properties of Solar Supergranulation",

L. Gizon, T.L. Duvall Jr., J. Schou, Nature 421, 43-44, 2003.

"A New Component of Solar Dynamics: North-South Diverging Flows Migrating

Toward the Equator with an 11-year Period",

J.G. Beck, L. Gizon, T.L. Duvall Jr., ApJL 575, L47-L50, 2002.

"Imaging an Emerging Active Region with Helioseismic Tomography",

J.M Jensen, T.L. Duvall Jr., B.H. Jacobsen, and J. Christensen-Dalsgaard,

ApJL 553, L193-L196, 2001.

"Time-Distance Helioseismology with f Modes as a Method for

Measurement of Near-Surface Flows", T.L. Duvall Jr. and L. Gizon,

Solar Physics 192, 177-191, 2000.

"Solar Tomography", A.G. Kosovichev and T.L. Duvall Jr.,

Current Science, 77, 1467-74, 1999.

"Long-lived Giant Cells Detected at the Solar Surface",

J.G. Beck, T.L. Duvall Jr., & P.H. Scherrer,

Nature, 394, 653-655, 1998.

"Time-Distance Helioseismology with the MDI Instrument: Initial Results",

T.L. Duvall Jr., A.G. Kosovichev, P.H. Scherrer, R.S. Bogart, R.I. Bush,

C. De Forest, J.T. Hoeksema, J. Schou, J.L.R. Saba, T.D. Tarbell,

A.M. Title, C.J. Wolfson, P.N. Milford, Solar Physics 170, 63-73, 1997.

Biography.

Dr. Duvall is one of the pioneers of helioseismology and has been

working in this area for more than twenty years.  He is at least partly

responsible for a number of discoveries, including the relation commonly

known as Duvall's law, the initial measurements of rotation and sound

speed throughout much of the solar interior, and the asymmetry of solar

oscillation spectral lines.  In recent years he helped invent the

technique known as time-distance helioseismology, in which travel times

are measured between different surface locations.  This new technique

has lead to interesting results, including the first measurements of

meridional circulation in the solar interior and the measurement of flows

and sound speed inhomogeneities below sunspots.