Temporal Variations of High-Degree Solar p-Modes from GONG and MDI
Burtseva, Olga · Tripathy, S. C. · Howe, R. · Jain, K. · Hill, F. · Bogart, R. · Rabello-Soares, M. C.
Original · EN
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.
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