Non-equilibrium ionization in coronal loops

Details Non-equilibrium ionization in coronal loops Non-equilibrium ionization in coronal loops

Apr 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982soph...77..153b&link_type=abstract

Solar Physics, vol. 77, Apr. 1982, p. 153-166. Research supported by the Consiglio Nazionale delle Ricerche.

Physics

16

Coronal Loops, Nonequilibrium Ionization, Density Distribution, Polytropic Processes, Temperature Distribution, Velocity Distribution

Scientific paper

The ionization conditions in coronal loops are investigated in the temperature range 2 × 105 -2 × 106 K, assuming velocity, density and temperature distributions computed for a siphon model of a pure hydrogen plasma. Use is made of the set of the carbon ions as an example of the general behaviour of the ions characteristic of that temperature range. It is found that the deviation from equilibrium ionization is large for subsonic-supersonic flow if the density is less than 5 × 109 cm-3, with the exception of the lower part of the first leg of very cool loops (T ≍ 2 × 105 K). With this exception cooler loops, given their larger density drop along the axis, show deviations from ionization equilibrium more easily than hotter ones, in spite of their lower flow velocity. We conclude that the possibility of a non-equilibrium state must be taken into account when deducing from measurements of line intensities the temperature of loops in which a flow may occur.

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