Determination of the Sun's seismic radius from the SOHO michelson doppler imager

Document Type

Article

Publication Date

1-1-1997

Abstract

Dopplergrams from the Michelson Doppler Imager (MDI) instrument on board the SOHO spacecraft have been used to accurately measure frequencies of the Sun's fundamental (f) mode in the medium angular degree range, l = 88-250. The comparison of these frequencies with the corresponding frequencies of the standard solar models suggests that the apparent photospheric solar radius (695.99 Mm) used to calibrate the models should be reduced by approximately 0.3 Mm. The precise value of the seismologically determined solar radius depends on the description of the subsurface layer of superadiabatic convection. The discrepancy between the "seismic" and apparent photospheric radii is not explained by the known systematic errors in the helioseismic and photospheric measurements. If confirmed, this discrepancy represents an interesting new challenge to theories of solar convection and solar modeling. © 1997. The American Astronomical Society. All rights reserved.

Identifier

33645831990 (Scopus)

Publication Title

Astrophysical Journal

External Full Text Location

https://doi.org/10.1086/316782

e-ISSN

15384357

ISSN

0004637X

First Page

L197

Last Page

L200

Issue

2 PART II

Volume

489

Grant

NAG5-3077

Fund Ref

Stanford University

This document is currently not available here.

Share

COinS