Heating the sun's lower transition region with fine-scale electric currents

Details Heating the sun's lower transition region with fine-scale electric currents Heating the sun's lower transition region with fine-scale electric currents

Oct 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...285..359r&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 285, Oct. 1, 1984, p. 359-367.

Astronomy and Astrophysics

Astrophysics

83

Chromosphere, Solar Atmosphere, Solar Corona, Solar Temperature, Conductive Heat Transfer, Field Aligned Currents, Ohmic Dissipation

Scientific paper

This paper discusses the hypothesis that the lower transition region is locally heated by the dissipation of electric currents. It proposes a model based on ohmic heating by filamentary electric currents that flow along the magnetic field. The current filaments must be of fine scale, with a narrow dimension in the range 1 cm to 1 km, and the ambient magnetic field must be greater than about 10 gauss. An ensemble of filamentary currents that agree in sign across the horizontal scale of a photospheric granule can generate enough heat to match observations without the need for anomalous resistivity. Thermal conduction perpendicular to the axis of a current filament produces a distribution of emission measure over temperature that is in good agreement with observations.

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