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Session 53 - First Results from the Global Oscillations Network Group (GONG).
Oral session, Wednesday, June 12
The solar oscillation spectrum and the fine structure in it from the first complete month of GONG data have been used to place a limit on the Sun's internal magnetic field. The limit is consistent with the magnetic pressure being no more than 1/1000 of the gas pressure between the Sun's deep interior and its surface. This conclusion is consistent with earlier results. The GONG data are from a time near magnetic activity minimum. The effect of the near surface magnetic field on the fine structure in the oscillation spectrum reflects a perturbation of quadrupole toroidal symmetry. This geometry also dominated at the last activity minimum. The meaning of this result is discussed. The near surface magnetic perturbation is not spherically symmetric. This corrupts the results of inversions designed to probe the Sun's deep interior. The solution to this problem is presented.
Program listing for Wednesday