Astronomy and Astrophysics – Astronomy
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009spd....40.0302z&link_type=abstract
American Astronomical Society, SPD meeting #40, #3.02; Bulletin of the American Astronomical Society, Vol. 41, p.809
Astronomy and Astrophysics
Astronomy
Scientific paper
Recently, the interactions between solar magnetic field and acoustic waves have been widely investigated using both numerical simulations and theoretical analysis,including effects of MHD wave transformations and absorption. However, a picture of how solar waves interact with a sunspot at the photospherical level has not been obtained observationally. In this presentation, we apply a time-distance correlation analysis to high-resolution MDI observations to investigate how the solar acoustic and surface gravity waves interact with sunspots. The analysis is carried out separately for the p- and f-mode waves. It is found that when acoustic sources are located outside the sunspot, the p-mode waves propagate through the sunspot with a faster speed and a reduced amplitude. The speed and amplitude become similar to the quiet Sun values after the waves pass through the active region. If the acoustic source is located inside the sunspot, the waves propagate with a reduced amplitude, and initially have a reduced speed but then accelerate. The f-mode waves often go through the sunspot with a reduced amplitude and a faster speed, but their amplitude and speed do not recover after passing the sunspot area. The results are nicely illustrated in movies showing the waves interacting with a sunspot.
Kosovichev Aleksandr G.
Zhao Junwei
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