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

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

2010-12-23

arxiv.org/abs/1012.5128v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

4 pages, 2 figures; Proceedings of the SOHO 24 / GONG 2010 conference, to be published in JPCS

Scientific paper

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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