Solar O IV and S IV lines from the High Resolution Telescope and Spectrograph (HRTS) and the S082B spectrograph on board Skylab.
Abstract
A comparison of theoretical O IV electron density diagnostics with observational data from a quiet solar region, a sunspot and an active region obtained with the High Resolution Telescope and Spectrograph (HRTS), and a flare observed with the S082B instrument on board Skylab, reveals that the O IV 1404.8 Å line is not only blended with the S IV 1404.8 Å transition, but also with an unknown feature that contributes a significant amount to the blend. It is therefore suggested that line ratios which include the O IV 1404.8 Å transition should not be employed as density diagnostics.
- Publication:
-
UV and X-ray Spectroscopy of Laboratory and Astrophysical Plasmas
- Pub Date:
- 1993
- Bibcode:
- 1993uxrs.conf..345K
- Keywords:
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- Solar Atmosphere: Extreme UV;
- Solar Atmosphere: Line Ratios;
- Solar Atmosphere: Electron Densities;
- Solar Atmosphere: UV Lines