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Astron. Astrophys. 317, L71-L74 (1997)

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Letter to the Editor

New IRIS constraints on the solar core rotation

L. Gizon 1, 2, E. Fossat 3, M. Lazrek 4, 5, A. Cacciani 6, S. Ehgamberdiev 7, B. Gelly 3, G. Grec 5, J.T. Hoeksema 8, S. Khalikov 7, P.L. Pallé 9, A. Pantel 3, C. Régulo 9, F.-X. Schmider 3 and P.R. Wilson 1

1 School of Mathematics and Statistics, University of Sydney, Sydney, NSW 2006, Australia
2 ESA Space Science Department, ESTEC, 2200 AG Noordwijk, The Netherlands
3 Département d'Astrophysique, URA CNRS 709, Université de Nice-Sophia Antipolis, F-06108 Nice Cedex 2, France
4 Laboratoire d'Astronomie et de Géophysique, CNCPRST, BP 8027, Rabat, Morocco
5 Département Cassini, URA CNRS 1362, Observatoire de la Côte d'Azur, BP 229, F-06304 Nice Cedex 4, France
6 Dipartimento di Fisica, Università di Roma "La Sapienza", Piazza Aldo Moro, Roma, Italy
7 Astronomical Institute of the Uzbek Academy of Sciences, Astronomicheskaya 33, Tashkent, Uzbekistan
8 Center for Space Science and Astrophysics, Stanford University, Stanford, CA 94305, USA
9 Instituto de Astrofisica de Canarias, E-38205 La Laguna, Tenerife, Spain

Received 7 September 1996 / Accepted 26 November 1996

Abstract

Four time series of IRIS data (4 to 6 months) have been used to obtain improved measurements of the low degree ([FORMULA]) rotational splitting frequencies. Assuming that the rotation law is known in the outer layers of the Sun, we investigate the implications of IRIS splittings for the central regions. Both a one-shell and a two-shell rotation model have been considered in the solar core. A core rotating slightly faster than the outer radiative envelope provides the best fit to the data. Some evidence for the reliability of the observations is shown by the visibility of differential rotation in the [FORMULA] multiplets.

Key words: Sun: rotation – Sun: oscillations – Sun: interior

Send offprint requests to: L. Gizon

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© European Southern Observatory (ESO) 1997

Online publication: July 8, 1998
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