Observations of the phase differences between irradiances and velocity for low-degree solar acoustic modes

Details Observations of the phase differences between irradiances and velocity for low-degree solar acoustic modes Observations of the phase differences between irradiances and velocity for low-degree solar acoustic modes

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...251..655s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 251, no. 2, Nov. 1991, p. 655-668.

Computer Science

Sound

25

Irradiance, Photosphere, Solar Atmosphere, Solar Oscillations, Sound Waves, Noise Spectra, Power Spectra, Radiative Transfer, Spectrum Analysis

Scientific paper

Irradiance measurements from the IPHIR instrument flown on the Phobos 2 mission to Mars are used to derive phase differences and gains between broadband relative irradiance signals and full-disk velocity variations for l = 0, 1, and 2 mode with order ranging from 12 to 32. These data are compared with contemporaneous measurements of photospheric velocities obtained during four intervals within the 155 d observation period of Phobos 2. It is found that the phase difference between irradiance at 500 nm and velocity is roughly constant with an average value of -119 +/- 3 deg from 2.5 mHz up to about 4.3 mHz with a slight increase suggested by data up to 4.6 mHz. The phase differences between the green and red channels do not differ significantly from zero below 2.8 mHz, while a small difference of about 13 +/- 5 deg exists at higher frequencies, with the red signal ahead of the green. This jump appears to coincide with a jump in the separation between the l = 0 and l = 2 eigenfrequencies.

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