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P. H. Scherrer, J. T. Hoeksema, A. G. Kosovichev (Stanford University), T. L. Duvall (NASA Goddard Space Flight Center), K. J. Schrijver, A. M. Title (Lockheed-Martin Solar and Astrophysics Laboratory)
The processes in the top 20,000-km of the Sun's convection zone govern the growth and decay of active regions and provide the magnetic flux and energy for the active phenomena of the upper solar atmosphere. The MDI experiment on SOHO has demonstrated that this region is now accessible to study by means of local helioseismology. However, SOHO provides neither the temporal nor spatial resolution and coverage necessary to exploit these techniques to study the eruption and evolution of active region magnetic structures. The SONAR mission with moderate resolution full disk Doppler and vector magnetic field observations, and atmospheric magnetic connectivity observations via EUV imaging can provide the necessary data. The science motivation and general instrumentation requirements for the mission are presented.
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