Physics
Scientific paper
Aug 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974soph...37..323d&link_type=abstract
Solar Physics, vol. 37, Aug. 1974, p. 323-342.
Physics
4
Astronomical Models, Chromosphere, Current Distribution, H Alpha Line, Magnetic Field Configurations, Solar Magnetic Field, Analog Simulation, Electromagnetic Spectra, Error Analysis, Filtergrams, Lorentz Force, Magnetic Flux, Magnetic Signatures, Solar Spectra, Vector Analysis, Vertical Distribution
Scientific paper
The three-dimensional vector magnetic field structure in the chromosphere above an active region is deduced by using high-resolution H-alpha filtergrams together with a simultaneous digital magnetogram. An analog model of the field is made with 400 metal wires representing field lines that outline the H-alpha structure. The height extent of the field is determined from vertical field-gradient observations around sunspots, from observed fibril heights, and from an assumption that the sources of the field are largely local. The computed electric currents (typically 10 mA/sq m) are found to flow in patterns not similar to observed features and not parallel to magnetic fields. Force structures correspond to observed solar features; the dynamics to be expected include: downward motion in bipolar areas in the lower chromosphere, an outflow of the outer chromosphere into the corona with radially outward flow above bipolar plage regions, and motion of arch filament systems.
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