Sunspot geometry and pressure balance

Details Sunspot geometry and pressure balance Sunspot geometry and pressure balance

Sep 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982soph...80...21g&link_type=abstract

Solar Physics, vol. 80, Sept. 1982, p. 21-31.

Physics

27

Magnetic Field Configurations, Penumbras, Solar Magnetic Field, Sunspots, Gas Pressure, Magnetic Signatures, Photosphere, Solar Limb, Umbras

Scientific paper

The current situation regarding the physical properties and geometrical level of sunspot umbras and the magnetic field configuration of spots is examined. It is found that an apparently acceptable model of the coarse structure of a sunspot and its equilibrium has been built up. However, there are at least two places where major errors occur. An investigation is conducted, and a more valid model is developed for sunspot and pressure balance. Observations and analysis show that, beyond the penumbra, the field from a sunspot forms an almost horizontal magnetic canopy, the average height of the canopy base being about 180 km at the outer penumbral edge. The penumbra being a magnetic structure, the canopy base is close to the lower penumbral surface there. Full pressure balance between internal and external gas pressures and the magnetic pressure on the sunspot axis is achieved within the uncertainties of measurement. Tension forces make no contribution exceeding the uncertainties of measurement.

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