Instrumental Effects on a Proposed Mg 2 Index of Solar Activity
AIR FORCE GEOPHYSICS LAB HANSCOM AFB MA
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The Mg II resonance lines near 2800 Angstroms have been proposed as a monitor for solar activity in the ultraviolet, particularly for the region around 2075A. Balloon measurements in 0.1 A resolution are used to investigate the dependence of the proposed index on the characteristics of the measuring instrument. It is shown that for measurements using instruments with low spectral resolution, the value of the index is very sensitive to individual instrument characteristics and that therefore scale standardization is difficult to maintain. Keywords Reprints, Magnesium II spectral lines, Solar ultraviolet irradiance, Solar activity.
- Atomic and Molecular Physics and Spectroscopy