Formation of granular intensity fluctuations on the Sun

Details Formation of granular intensity fluctuations on the Sun Formation of granular intensity fluctuations on the Sun

Nov 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002a%26a...395..279p&link_type=abstract

Astronomy and Astrophysics, v.395, p.279-284 (2002)

Astronomy and Astrophysics

Astrophysics

8

Sun: Photosphere, Sun: Granulation, Radiative Transfer

Scientific paper

We deal with granular intensity fluctuations in the Sun and how they are caused by temperature fluctuations. We calculate temperature response functions RFT(lambda ,z) in the solar photosphere. We apply the Diagonal Element Lambda Operator (DELO) method to calculate the response functions for the continuum (lambda lambda = 380 nm-2.5 mu ). LTE is assumed throughout. It is demonstrated that, within the framework of the linear approximation, the H- continuum absorption plays an important role for the formation of the fluctuations in continuum images. It counteracts substantially the intensity fluctuations caused by variations of the Planck function. The temperature response functions are used to calculate, for three models of temperature fluctuations, the continuum intensity contrasts and their formation height for the above wavelength range.

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