Recent Advances From The GONG Time-distance Helioseismology Team

Details Recent Advances From The GONG Time-distance Helioseismology Team Recent Advances From The GONG Time-distance Helioseismology Team

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.2213h&link_type=abstract

American Astronomical Society Meeting 210, #22.13; Bulletin of the American Astronomical Society, Vol. 39, p.126

Astronomy and Astrophysics

Astronomy

Scientific paper

We present some recent work using the time-distance method of local helioseismology as applied to Global Oscillation Network Group (GONG) data. Four projects will be included:
1) North-south travel time differences for zonal modes (m=0) have been computed for the period 1995-2006. These measurements provide information on the meridional flow, and can be used to study temporal variations over the activity cycle.
2) The autocorrelations of the low-degree (l=0, 1, 2, 3) time series have been computed. These functions have been analyzed to obtain a very precise measurement of the large splitting and solar acoustic radius. A significant temporal variation correlated with the activity level can be clearly seen.
3) The lifetimes of high-degree modes have been estimated with the time-distance method. The results for high and low activity will be discussed.
4) A project to search for active regions prior to their emergence has been initiated. Some approaches to the problem will be outlined.
The National Solar Observatory is operated by the Association of Universities for Research in Astronomy under a cooperative agreement with the National Science Foundation, for the benefit of the astronomical community.

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