Professor Nigel Weiss
Who I am
Emeritus Professor of Mathematical Astrophysics, University of
Cambridge; Fellow of Clare College; FRS.
Research interests
Solar and Stellar Magnetic Fields, Astrophysical Fluid Dynamics, Nonlinear
Dynamics
Solar activity and global warming
The Sun's magnetic activity varies cyclically with a period of about 11
years and activity has been abnormally high for the for the past 80 years.
As might have been expected, this prolonged grand maximum is coming to an
end. The new Sunspot Cycle 24 looks likely to be the weakest for at
least 100, probably for 200, years; it is conceivable that the Sun
might even be entering a grand minimum, which would be expected to have a
cooling effect on the Earth's climate. I have always maintained, however,
that any temperature changes caused by variations in solar activity are small
compared to the global warming that we are already experiencing, and very
small compared to what will happen if we continue to
burn fossil fuel at the present rate.
Recent publications
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Simon, G.W., Title, A.M. & Weiss, N.O. ``Sustaining the Sun's magnetic
network with emerging bipoles'', Astrophys. J. 561, 427--434,
2001.
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Cattaneo, F., Lenz, D. & Weiss, N.O. ``On the origin of the solar
mesogranulation'', Astrophys. J. 563, L91--L94, 2001.
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Galloway, D.J., Uchida, Y. & Weiss, N.O. ``Generation of coronal
currents by the solar convection zone'', Pub. Astron. Soc. Australia
18, 329--335, 2001.
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Blanchflower, S. & Weiss, N.O. ``Three-dimensional magnetohydrodynamic
convectons'', Phys. Lett. A 294, 297--303, 2002.
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Weiss, N.O. ``Dynamos in planets, stars and galaxies'',
Astron. Geophys. 43, 3.9--3.14, 2002,
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Weiss, N.O. ``Umbral and penumbral magnetoconvection'',
Astron. Nachr. 323, 371--376, 2002,
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Thomas, J.H., Tobias, S.M., Weiss, N.O. & Brummell, N.H.
``Magnetic flux pumping and the structure of a sunspot penumbra",
Astron. Nachr. 323, 383--386, 2002,
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Weiss, N.O., Proctor, M.R.E. & Brownjohn, D.P. ``Magnetic flux
separation in photospheric convection'', Mon. Not. Roy. Astr. Soc.
337, 293--304, 2002.
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Thomas, J.H., Tobias, S.M., Weiss, N.O. & Brummell, N.H.
`` Downward pumping of magnetic flux as the cause of filamentary structures
in sunspot penumbrae'', Nature 420, 390--393, 2002.
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Weiss, N.O. ``Modelling solar and stellar magnetoconvection'',
in Stellar Astrophysical Fluid Dynamics, ed. M.J. Thompson &
J. Christensen-Dalsgaard, pp. 329--343, Cambridge University Press,
2003.
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Cattaneo, F., Emonet, T. & Weiss, N.O. ``On the interaction between
convection and magnetic fields'', Astrophys. J. 588, 1183--1198,
2003.
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Weiss, N.O., Thomas, J.H., Tobias, S.M. & Brummell, N.H. ``Magnetic
pumping and the origin of penumbral structure in sunspots'',
Astrophys. J. 600, 1073--1090, 2004.
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Kersale, E., Hughes, D.W., Ogilvie, G.I., Tobias, S.M. & Weiss, N.O.
``Global magnetorotational instability with inflow. I. Linear theory and the
role of boundary conditions'',
Astrophys. J. 602, 892--903, 2004.
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Tobias, S.M., Weiss, N.O. & Beer, J. ``Long-term prediction of solar
activity'', Astron. Geophys. 45, 2.6, 2004,
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Tildesley, M.J. & Weiss, N.O. ``On the origin of filamentary structure
in sunspot penumbrae: nonlinear results'',
Mon. Not. Roy. Astr. Soc. 350, 657--670, 2004.
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Tobias. S.M. & Weiss, N.O. ``The puzzling structure of a sunspot'',
Astron. Geophys. 45, 4.28--4.33, 2004.
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Thomas. J.H. & Weiss, N.O. ``Fine structure in sunspots'',
Ann. Rev. Astron. Astrophys. 42, 517--548, 2004.
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Weiss, N.O. ``Linear and nonlinear dynamos'',
Astron. Nachr. 326, 157--165, 2005.
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Hughes, D.W., Rosner, R. & Weiss, N.O. ``Magnetohydrodynamics of
stellar interiors'', Astron. Geophys. 46, 4.36--4.37,
2005.
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Thomas, J.H., Tobias, S.M., Weiss, N.O. & Brummell, N.H.
``On the fine structure of magnetic fields in sunspot penumbrae'',
Astron. Astrophys. 452, 1089--1090, 2006.
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Weiss, N.O. ``The puzzling structure of a sunspot'', in
Solar MHD Theory and Observations: a High Spatial Resolution
Perspective, ed. H. Uitenbroek, J. Leibacher & R.F. Stein,
Astron. Soc. Pacific Conf. Series 354, pp. 213--223, 2006.
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Weiss, N.O. ``Sunspot structure and dynamics'', Space Sci. Rev.
124, 13--22. 2006.
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Tobias, S.M. & Weiss, N.O. ``The solar dynamo and the tachocline'',
in The Solar Tachocline, ed. D.W. Hughes, R. Rosner & N.O. Weiss,
Cambridge University Press, pp. 319--350, 2007.
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Tobias, S.M. & Weiss, N.O. ``Stellar dynamos'', in Mathematical
Aspects of Natural Dynamos, ed. E. Dormy & A.M. Soward,
Grenoble Sciences/CRC Press, Boca Raton, pp. 281--311, 2007.
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Isobe, H., Proctor, M.R.E. & Weiss, N.O. ``Convection-driven emergence
of granular scale magnetic field and its role in coronal heating and
solar wind acceleration'', Ap. J. Lett. 679, L57--L60, 2008.
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Bushby, P.J., Houghton, S.M., Proctor, M.R.E. & Weiss, N.O.
``Numerical simulations of magnetic flux concentration in the quiet Sun'',
Mon. Not. Roy. Astr. Soc. 387, 698--706, 2008.
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Brummell, N.H., Tobias, S.M., Thomas, J.H. & Weiss, N.O.
``Flux pumping and magnetic fields in the outer penumbra of a sunspot'',
Astrophys. J. 686, 1454--1465, 2008.
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Abreu, J.A., Beer, J., Steinhilber, S., Tobias, S.M. & Weiss, N.O.
``For how long will the current grand maximum of solar activity persist?''
Geophys. Res. Lett. 35, L20109, 2008.
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Thomas, J.H. & Weiss, N.O. Sunspots and Starspots, Cambridge
University Press, 2008.
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Weiss, N.O. & Thompson, M.J. ``The solar dynamo'', Space Sci. Rev.
144, 53--66, 2009.
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Balbus, S.A., Bonart, J., Latter, H. &\mp; Weiss, N.O. ``On differential
rotation and convection in the Sun'', Mon. Not. Roy. Astr. Soc.
400, 176--182, 2009.
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Balbus, S.A. & Weiss, N.O. ``Differential rotation in fully
convective stars'', Mon. Not. Roy. Astr. Soc.
404, 1263--1271, 2010.
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Weiss, N.O.``Modulation of the sunspot cycle'', Astron. Geophys.
51, 3.9--3.15, 2010.
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Proctor, M.R.E., Weiss, N.O., Thompson, S.D & Roxburgh, N.T.
``Effects of boundary conditions on the onset of convection with tilted
magnetic fields'', Geophys. Astrophys. Fluid. Dyn.
105, 82-89, 2011.
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Weiss, N.O. ``Chaotic behaviour in low-order models of planetary and
stellar dynamos'',Geophys. Astrophys. Fluid. Dyn.
105,256-272, 2011.
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Bushby, P.J., Proctor, M.R.E. & Weiss, N.O. ``The influence of
stratification upon small-scale convectively-driven dynamos'', in
IAU Symp. No. 271: Astrophysical Dynamos: from Stars to Galaxies,
ed. N.H. Brummell, A.S. Brun, M.S. Miesch & Y. Ponty, pp. 197--204,
Cambridge University Press, 2011.
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Weiss, N.O. ``Solar and Stellar Dynamos'', in IAU Symp. No. 271:
Astrophysical Dynamos: from Stars to Galaxies, ed. N.H. Brummell,
A.S. Brun, M.S. Miesch & Y. Ponty, pp. 247--260,
Cambridge University Press, 2011.
Other interests and links
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Isaac Newton Trust: Trustee (1999-2005, 2006- ), Chairman (2007- )
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Member of National Gallery Scientific Consultative Group (1996- )
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Visiting Professor, University of Leeds (2000-2007)
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President of the Royal Astronomical Society (2000-2002), Gold Medallist
(2007)
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President of the Fellowship, Clare College (2002-2005)
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Co-Organiser of Newton Institute Programme on MHD of Stellar
Interiors (Sept.-Dec. 2004)
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Formerly Chairman of the School of Physical Sciences (1993-1998) and on
the General Board of the Faculties and the Council's Finance
Committee (1995-1998)
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Astrophysics/Nonlinear Dynamics Group in DAMTP
Nigel Weiss, October
2008,
DAMTP,
University of Cambridge, CMS,
Wilberforce Road, Cambridge CB3 0WA