Downflow in the supergranulation network and its implications for transition region models

Details Downflow in the supergranulation network and its implications for transition region models Downflow in the supergranulation network and its implications for transition region models

Mar 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978soph...57...49p&link_type=abstract

Solar Physics, vol. 57, Mar. 1978, p. 49-64.

Physics

110

Atmospheric Models, Solar Atmosphere, Solar Granulation, Spicules, Astronomical Models, Chromosphere, Solar Corona, Solar Wind

Scientific paper

Independent rocket-borne and spaceborne observations have indicated the existence of steady downflows of the order of a few kilometers per second in the solar transition region overlying the chromospheric network. Using density estimates at these heights from traditional transition region models, this paper determines that the downward mass fluxes associated with these velocities are comparable to the estimated upward mass flux in spicules, originating in the same regions. Since both observations and theoretical calculations show that the solar wind can accept only a small fraction of the upward spicule flux, it is suggested that the downflow represents spicular material returning to the chromosphere after being heated to coronal temperatures. The enthalpy flux associated with the downflow is shown to exceed the inward heat flow expected by thermal conduction and may be the dominant energy source for the transition region.

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