Solar flares and temporal changes in subsurface vorticity measurements

Details Solar flares and temporal changes in subsurface vorticity measurements Solar flares and temporal changes in subsurface vorticity measurements

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011jphcs.271a2019k&link_type=abstract

Journal of Physics: Conference Series, Volume 271, Issue 1, pp. 012019 (2011).

Physics

Scientific paper

We derive the kinetic helicity density of subsurface flows applying ring-diagram analysis to Global Oscillation Network Group (GONG) data. Here, we focus on flows derived from times series of 8 hours and compare them to daily values for a high- and a low-activity sample. Compared with daily values, the horizontal flows derived from 8-hour time series are reasonable near disk center and less reliable near the limb. Also, the errors are larger for shorter time series. A dipolar helicity pattern is present in the flows derived from 8-hour and 24-hour time series of flare-productive active region 10808. For the quiet-Sun sample, the subsurface kinetic helicity is considerably smaller without any pattern.

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