Joule heating as an explanation for the differential emission measure structure and systematic redshifts in the sun's lower transition region

Details Joule heating as an explanation for the differential emission measure structure and systematic redshifts in the sun's lower transition region Joule heating as an explanation for the differential emission measure structure and systematic redshifts in the sun's lower transition region

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...379..392r&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 379, Sept. 20, 1991, p. 392-400.

Astronomy and Astrophysics

Astrophysics

18

Chromosphere, Plasma Heating, Red Shift, Resistance Heating, Solar Corona, Current Density, Electric Current, Field Aligned Currents, Magnetohydrodynamics, Ohmic Dissipation, Plasma Temperature

Scientific paper

A new model is described for the sun's lower transition region which extends the ideas of Antiochos and Noci (1986) and Rabin and Moore (1984) but avoids their use of ad hoc heating functions and extremely small spatial scales, respectively. Specifically, it is proposed that most of the lower transition region plasma is contained in sheared magnetic boundary layers separating adjacent flux loops above the network lanes, and that this plasma is heated by the Joule dissipation of intense, field-aligned electric currents. A simple model for a sheared magnetic boundary layer is developed, and the field-aligned electric currents flowing inside it are calculated. A 1D hydrodynamic model is used to determine the atmospheric structure along a Joule-heated field line embedded in a sheared magnetic boundary layer. It is found that when the electric current density is less than a certain critical value, the atmosphere along the field line evolves toward a 'cool' equilibrium state, with T(max) less than 80,000 K.

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