Coronal line-width variations

Details Coronal line-width variations Coronal line-width variations

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998soph..181...91d&link_type=abstract

Solar Physics, v. 181, Issue 1, p. 91-101 (1998).

Physics

41

Scientific paper

Line-width measurements of the coronal ion Siviii confirm earlier observations which show an increase in the non-thermal velocity above the solar limb. The present data, taken at the equatorial limb, show an increase from 24 km s^-1 at the limb to 28 km s^-1 some 25000 km above the limb. The electron density as measured from the Siviii line pair shows a decrease from 3.5 x 10^8 cm^-3 to 1.8 x 10^8 cm^-3 over the same distance. These data imply that the non-thermal velocity is inversely proportional to the quadratic root of the electron density, in excellent agreement with that predicted for undamped radially propagating Alfvén waves.

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