Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsh11a1604k&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SH11A-1604
Astronomy and Astrophysics
Astrophysics
[7522] Solar Physics, Astrophysics, And Astronomy / Helioseismology, [7524] Solar Physics, Astrophysics, And Astronomy / Magnetic Fields, [7544] Solar Physics, Astrophysics, And Astronomy / Stellar Interiors And Dynamo Theory
Scientific paper
Despite a long history of observations of sunspots and active regions the mechanisms of their formation and stability are still a puzzle. These mechanisms are controlled by a complex interaction of magnetic fields and turbulent convection below the solar surface. The helioseismology observations on SOHO/MDI have provided snapshots of the subsurface dynamics during formation and evolution of several active regions and sunspots. They showed substantial changes in the structure and flow patterns at various stages of the evolution and flaring activity. However, the MDI data were too fragmented for systematic studies. The Helioseismic and Magnetic Imager (HMI) on SDO gives us a unique opportunity for detailed high-resolution investigations of the subsurface structures and mass flows associated with the formation and life cycle of active regions. We present the results of the initial analysis of magnetic active regions by time-distance helioseismology of the HMI Doppler-shift data. These include some interesting events, previously not investigated by helioseismology, such as splitting of a sunspot into two separate spot and formation of penumbra. We discuss also the capabilities of SDO for time-distance helioseismology, current uncertainties, and potentials based on the initial experience.
Duvall Thomas L.
Kosovichev Aleksandr G.
Zhao Jun
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