Comment on ``Variations of Total Solar Irradiance Produced by Structural Changes in the Solar Interior''

Details Comment on ``Variations of Total Solar Irradiance Produced by Structural Changes in the Solar Interior'' Comment on ``Variations of Total Solar Irradiance Produced by Structural Changes in the Solar Interior''

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004eostr..85..524f&link_type=abstract

Eos, Transactions American Geophysical Union, Volume 85, Issue 49, p. 524-524

Astronomy and Astrophysics

Astrophysics

1

Solar Physics, Astrophysics, And Astronomy: Solar Irradiance, Solar Physics, Astrophysics, And Astronomy: Magnetic Fields, Solar Physics, Astrophysics, And Astronomy: Helioseismology

Scientific paper

In a recent Eos article, Sofia [2004] argues for the influence on irradiance variation of global changes in the Sun's structure associated with its magnetic dynamo. These changes would act in addition to the relatively well understood modulation by dark sunspots and bright faculae at the surface. His assessment of the present observational evidence for such a global change agrees with our earlier conclusion that it is not widely convincing at the present time [Foukal, 2003]. But Sofia's article also claims (1) that the numerical results obtained by him and his collaborators at Yale disagree with and correct earlier work, and (2) that a hydrostatic approximation is not adequate for variations on the 11-year solar cycle timescale. These surprising claims are based on the results of recently published hydrostatic models [e.g., Sofia and Li, 2004] using the same mixing length approximation for convective heat transport used in earlier work [Spruit, 1982, 1991; Gilliland, 1988].

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