Bibcode
Jimenez, A.; Palle, P. L.; Cortes, T. Roca; Domingo, V.
Bibliographical reference
Astronomy and Astrophysics (ISSN 0004-6361), vol. 193, no. 1-2, March 1988, p. 298-302. CAICYT-supported research.
Advertised on:
3
1988
Citations
24
Refereed citations
22
Description
Following the work started in 1984 to detect the solar intensity
oscillations from ground (Jimenez et al., 1986), simultaneous velocity
and intensity observations of 16 contiguous days of very high
atmospheric quality obtained at Izana (Tenerife) have been analyzed. The
frequencies of the p-mode intensity spectrum at three channels (500, 680
and 870 nm) and those of the velocity spectrum have been obtained.
Amplitude ratios in the intensity measurements give results of 1.6 and
2.2 when comparing the last two channels with the first one, and their
relative phases give a null result at any frequency in the 5 minute
range. The relative phases between luminosity and intensity measurements
give a mean result of -120 degrees. Finally, the ratio of the amplitudes
of the intensity oscillations to the velocity ones correlates very well
with theoretical expectations and it yields a fractional variation of
the effective temperature of 2 x 10 to the -6th.