The effect of solar oscillations on the brightness of the limb

Details The effect of solar oscillations on the brightness of the limb The effect of solar oscillations on the brightness of the limb

Jun 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...161....7s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 161, no. 1, June 1986, p. 7-11.

Astronomy and Astrophysics

Astrophysics

5

Brightness Distribution, Solar Atmosphere, Solar Limb, Solar Oscillations, Helioseismology, Radiative Transfer, Solar Temperature

Scientific paper

Using the realistic atmosphere model VALC, and assuming a spherical geometry, the intensity of the solar limb is calculated, and measured amplitude fluctuations are compared with those expected due to oscillations. In the model, the atmosphere is perturbed successively by density and temperature fluctuations of amplitude smaller than the 6 percent limiting value, and the perturbations are defined by exponential laws corresponding to propagating or evanscent waves. It is shown that 5-minute oscillations lead to variations in the brightness gradient of less than 2 percent. Limb brightness fluctuation amplitudes observed with the Pic du Midi heliometer (Yerle, 1981) show peaks of 10 percent which have too high a value to be explained by solar wave theory.

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