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- W2040890670 abstract "view Abstract Citations (6) References Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Emission of Hydromagnetic Waves from Sunspot Umbras. Danielson, Robert E. Abstract Linearized equations describing convection in the presence of a magnetic field predict overstable oscillations in sunspot umbras. No such oscillations have been observed, however. The equations which predict these oscillations have boundary conditions which allow only standing wave oscillations. It is suggested that these are not the correct boundary conditions to use. More physically realistic boundary conditions would allow the convective layer to emit hydromagnetic waves. The critical equivalent Rayleigh number for the emission of hydromagnetic waves has been computed for various magnetic field strengths using these new boundary conditions. The equivalent Rayleigh number in sunspot umbras seems to exceed the critical equivalent Rayleigh number. Thus it appears possible that a significant nonthermal flux of hydromagnetic waves is emitted by sunspot umbras. Such a flux is consistent with the fact that higher velocities are observed in sunspots than in the normal photosphere. It might also account for the missing energy in sunspots. This work is part of Project Stratoscope, which is sponsored by ONR, NSF, and NASA. Publication: The Astronomical Journal Pub Date: March 1962 DOI: 10.1086/108837 Bibcode: 1962AJ.....67Q.574D full text sources ADS |" @default.
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- W2040890670 date "1962-03-01" @default.
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- W2040890670 title "Emission of Hydromagnetic Waves from Sunspot Umbras." @default.
- W2040890670 doi "https://doi.org/10.1086/108837" @default.
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