Coronal hole diagnostics out to 8Rsun

Details Coronal hole diagnostics out to 8Rsun Coronal hole diagnostics out to 8Rsun

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...349..956d&link_type=abstract

Astronomy and Astrophysics, v.349, p.956-960 (1999)

Astronomy and Astrophysics

Astrophysics

61

Waves, Sun: Corona, Sun: Uv Radiation

Scientific paper

The Si viii line width measurements and N_e estimates based on SUMER observations are combined with LASCO and UVCS output to provide an overview of its variations with height above a polar coronal hole. From the combined dataset we find a radial dependence of the electron density, in the range 1-2 Rsun as r(-8) , from 2 to 4 Rsun as r(-4) and then as r(-2) . Combining the Si viii half width at 1/e of the peak intensity with the UVCS O vi half width, we find a small increase of the half width from 1 to 1.2 Rsun, then a plateau until 1.5 Rsun, thereafter a sharp increase until 2 Rsun, finally a more gradual increase reaching 550 km s(-1) at 3.5 Rsun. Our data suggests that the MHD waves responsible for the excess line broadening tends to become non-linear as it reaches 1.2 Rsun.

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