Electron densities above a polar coronal hole based on improved SI IX density diagnostics

Details Electron densities above a polar coronal hole based on improved SI IX density diagnostics Electron densities above a polar coronal hole based on improved SI IX density diagnostics

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999soph..188...73d&link_type=abstract

Solar Physics, v. 188, Issue 1, p. 73-80 (1999).

Physics

8

Scientific paper

Using new close-coupling excitation rates for the C-like ion Siix, density-diagnostic ratios based on Siix lines have been re-evaluated and applied to a sequence of CDS observations taken above a polar coronal hole. The derived electron densities are in excellent agreement with previous values of N_e estimated from the N-like ion Siviii for another coronal hole. The confirmed trend is for a fall-off of one order of magnitude within the first 0.3 R_solar above the limb. These densities are well fitted with an analytic formula for the density profile out to at least 8 R_solar, by which stage the electron density has fallen to ~4x10^3 cm^-3, from 1.5x10^8 cm^-3 at 1.0 R_solar.

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