Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...275..354o&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 275, Dec. 1, 1983, p. 354-366. Research supported by the Smithsonian Instit
Astronomy and Astrophysics
Astrophysics
41
Plasma Diagnostics, Solar Temperature, Solar Wind, Stellar Coronas, Electron Energy, Flow Velocity, Ion Density (Concentration), Ionic Mobility
Scientific paper
The 'frozen' solar wind ionization state within a few solar radii of the photosphere suggests that ion measurements at 1 AU may yield information on the electron temperature conditions at the base of the coronal expansion. The freezing-in process is examined in light of traditional assumptions as to coronal expansion, where electron temperature decreases monotonically with height, the bulk flow of all charge states of a given ion species are equal to the proton speed, and the ion outflow is spherically symmetric. The consequences of the relaxation of these assumptions include the underestimation of the magnitude of a temperature maximum occurring near the freezing-in radius. Because it is associated with high speed, low density flow, an areal divergence that is faster than that in a spherical outflow lowers the ionization state freezing-in level relative to that which is typical in spherically symmetric expansion.
Holzer Thomas Edward
Hundhausen Arthur J.
Owocki Stanley P.
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