Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004apj...608..562h&link_type=abstract
The Astrophysical Journal, Volume 608, Issue 1, pp. 562-579.
Astronomy and Astrophysics
Astronomy
25
Sun: Activity, Sun: Helioseismology, Sun: Magnetic Fields, Sun: Oscillations
Scientific paper
We use the ring-diagram technique of local helioseismology to study the amplitude and line width of high-degree solar acoustic modes from 474 days of data from the Michelson Doppler Imager Dynamics program, covering the period 1996-2002. The 2002 data are compared with contemporaneous data from the Global Oscillations Network Group network. The results, once instrumental effects have been removed, show a strong dependence of the amplitude and lifetime of the modes on the local magnetic flux, with the amplitude and lifetime decreasing in the 5 minute band and a reversed trend at high frequencies. We relate these findings to results from global modes and from other approaches for analyzing high-degree local oscillations.
Haber Deborah A.
Hill F. F.
Hindman Bradley W.
Howe Rachel
Komm Rudolf W.
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