Interaction of solar subsurface flows with major active regions

Details Interaction of solar subsurface flows with major active regions Interaction of solar subsurface flows with major active regions

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.517..103h&link_type=abstract

In: Proceedings of SOHO 12 / GONG+ 2002. Local and global helioseismology: the present and future, 27 October - 1 November 2002,

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13

Helioseismology, Ring Diagrams

Scientific paper

Solar Subsurface Weather (SSW), which consists of complex and meandering large-scale horizontal flows below the solar surface, has been studied in detail with ring analyses of SOI-MDI data from SOHO. SSW flows are of particular significance since they appear to interact and influence the magnetic fields visible at the surface, with active regions appearing as zones of convergent flow and possible downflows. Such subsurface flows over a range of depths can mechanically twist and displace field lines, possibly leading to unstable magnetic configurations that may flare or erupt as coronal mass ejections. It is highly likely that such flows and magnetic fields are broadly linked in their evolution. We have studied in detail horizontal flow fields in the vicinity of several major active regions observed during 2001 and 2002, finding that at shallow depths there is general flow convergence toward these regions and noticeable flow deflections in the large-scale zonal and meridional circulations. We have detected strengthening of jet-like features in the converging flows occurring over the course of several days. These features are accompanied by prominent diverging outflows at greater depths. It appears that the large-scale flow fields surrounding active complexes have a distinct cellular structure that may contribute to both the overall cohesion of active regions as well as to the movement of magnetic flux within those regions that can lead to flares and other eruptive phenomena.

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