Abstract
Local helioseismic techniques, such as ring analysis and time-distance helioseismology, have already shown that large-scale flows near the surface converge towards major active regions. Ring analysis has further demonstrated that at greater depths some active regions exhibit strong outflows. A critique leveled at the ring-analysis results is that the Regularized Least Squares (RLS) inversion kernels on which they are based have negative sidelobes near the surface. Such sidelobes could result in a surface inflow being misidentified as a diverging outflow at depth. In this paper we show that the Optimally Located Averages (OLA) inversion technique, which produces kernels without significant sidelobes, generates flows markedly similar to the RLS results. Active regions are universally zones of convergence near the surface, while large complexes evince strong outflows deeper down.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Brun, A. S. and Toomre, J.: 2002, Astrophys. J. 570, 865.
Christensen-Dalsgaard, J., Schou, J., and Thompson, M. J.: 1990, Monthly Notices Royal Astron. Soc. 242, 353.
Dzifčáková, E., Kulinová, A., and Kosovichev, A. G.: 2003, in H. Sawaya-Lacoste (ed.), Local and Global Helioseismology: The Present and Future, ESA SP-517, Noordwijk, The Netherlands, p. 263.
Gizon, L., Duvall, T. L., Jr., and Larsen, R. M.: 2000, J. Astrophys. Astron. 21, 339.
Gizon, L., Duvall, T. L., Jr., and Larsen, R. M.: 2001, in P. Brekke, B. Fleck, and J.B. Gurman (eds.), Recent Insights into the Physics of the Sun and Heliosphere: Highlights from SOHO and Other Space Missions, Proc. IAU Symp. 203, p. 189.
Haber, D. A., Hindman, B.W., and Toomre, J.: 2003, in H. Sawaya-Lacoste (ed.), Local and Global Helioseismology: The Present and Future, ESA SP-517, Noordwijk, The Netherlands, p. 103.
Haber, D. A., Hindman, B. W., Toomre, J., Bogart, R. S., Thompson, M. J., and Hill, F.: 2000, Solar Phys. 192, 335.
Haber, D. A., Hindman, B.W., Toomre, J., Bogart, R. S., and Hill, F.: 2001, in A. Wilson (ed.), Helio-and Astero-seismology at the Dawn of the Millenium, ESA SP-464, Noordwijk, The Netherlands, p. 209.
Haber, D. A., Hindman, B.W., Toomre, J., Bogart, R. S., Larsen, R.M. and Hill, F.: 2002, Astrophys. J. 570, 855.
Kosovichev, A. G., Duvall, T. L., Jr., and Zhao, J.: 2002, in H. Sawaya-Lacoste (ed.), Proc. IAU Colloq. 188, ‘Magnetic Coupling of the Solar Atmosphere’, ESA SP-505, Noordwijk, The Netherlands, p. 79.
Lites, B. W., Socas-Navarro, H., Skumanich, A., and Shimizu, T.: 2002, Astrophys. J. 575, 1131.
Rimmele, T. R.: 1995, Astrophys. J. 445, 511.
Scherrer, P. H. et al.: 1995, Solar Phys. 162, 129.
Schou, J. et al.: 1998, Astrophys. J. 505, 390.
Thompson, M. J.: 1993, in T. M. Brown (ed.), GONG 1992: Seismic Investigation of the Sun and Stars, ASP Conf. Ser. 42, San Francisco, p. 141.
Title, A., Topka, K. P., Tarbell, T. D., Schmidt, W., Balke, C., and Scharmer, G.: 1992, Astrophys. J. 393, 782.
Zhao, J. and Kosovichev, A. G.: 2003, Astrophys. J. 591, 446.
Zhao, J. and Kosovichev, A. G.: 2004, Astrophys. J. 603, 776.
Zhao, J., Kosovichev, A. G., and Duvall, T. L., Jr.: 2001, Astrophys. J. 557, 384.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Haber, D., Hindman, B., Toomre, J. et al. Organized Subsurface Flows near Active Regions. Solar Physics 220, 371–380 (2004). https://doi.org/10.1023/B:SOLA.0000031405.52911.08
Issue Date:
DOI: https://doi.org/10.1023/B:SOLA.0000031405.52911.08