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On the difference between low-ℓ p-mode frequencies seen in velocity and in intensity

Gavryusev, V. G.; Gavryuseva, E. A.

We compare the line profiles and frequencies of low ℓ=0, 1, 2 acoustic oscillations seen in observations in velocity (by the GOLF and GONG experiments) and in intensity (LOI instrument). Our study indicates that the systematic shift between the frequencies of low-ℓ pmodes in intensity and in velocity measurements recently discovered by Toutain and…