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Temporal Variations of High-Degree Solar p-Modes from GONG and MDI

We study temporal variations in the amplitudes and widths of high-degree acoustic modes in the quiet and active Sun by applying ring-diagram technique to the GONG+ and MDI Dopplergrams during the declining phase of cycle 23. The increase in amplitudes and decrease in line-widths in the declining phase of the solar activity is in agreement with previous studies. A similar solar cycle trend in the mode parameters is also seen in the quiet-Sun regions but with a reduced magnitude. Moreover, the amplitudes obtained from GONG+ data show long-term variations on top of the solar cycle trend.

preprint2010arXivOpen access
Olga BurtsevaS. C. TripathyR. HoweK. JainF. HillR. BogartM. C. Rabello-Soares
astro-ph.SR
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Olga BurtsevaS. C. TripathyR. HoweK. JainF. HillR. BogartM. C. Rabello-Soares

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