Demonstrating the limitations of line ratio temperature diagnostic using Fe X and Fe XIV spectral line intensity observations

Details Demonstrating the limitations of line ratio temperature diagnostic using Fe X and Fe XIV spectral line intensity observations Demonstrating the limitations of line ratio temperature diagnostic using Fe X and Fe XIV spectral line intensity observations

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aipc..382..173e&link_type=abstract

Proceedings of the eigth international solar wind conference: Solar wind eight. AIP Conference Proceedings, Volume 382, pp. 173

Computer Science

Solar Electromagnetic Emission, Visible, X-Ray

Scientific paper

The electron temperature in the inner corona can be derived from spectral line intensity measurements by comparing the ratio of the measured intensities of two spectral lines to the ratio calculated from theoretical models. In a homogeneous plasma the line ratio technique can be used for any two lines if the ratio of the intensities is independent of the density. The corona, however, is far from homogeneous and usually several distinct structures are present along the line-of-sight. For example, even the large polar coronal holes at solar minimum can be partly or completely obscured by emission from hotter and denser surrounding regions. In this case the structures that contribute to the line intensity do not occupy the same volume if the peak temperature of the spectral lines are too widely separated. We demonstrate this effect for the southern polar coronal hole, using daily intensity measurements of the Fe XIV 5303 Å and Fe X 6374 Å spectral lines from the National Solar Observatory at Sacramento Peak (NSO/SP), X-ray emission from daily YOHKOH observations, and polarization brightness measurements from the HAO white light coronagraph at Mauna Loa Solar Observatory. We then show that the temperature in the southern coronal hole derived from the ratio of the two Fe spectral lines, varies by more than 0.8×106 K due to the changing contribution from surrounding regions.

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