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

Bibcode
1991A&A...251..655S
Schrijver, C. J.; Dappen, W.; Jimenez, A.
Referencia bibliográfica

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

Fecha de publicación:
11
1991
Número de autores
3
Número de autores del IAC
1
Número de citas
28
Número de citas referidas
20
Descripción
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.
Tipo
Con árbitro
Ambiente solar
Oscilaciones solares
Transferencia radiativa

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