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GHRS ISR 071: Stability of the GHRS Sensitivity During Cycle 4

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Claus Leitherer and Lisa E. Sherbert
June 1995

Abstract

The sensitivity of the GHRS on Side 1 and Side 2 was monitored approximately every 3 months during Cycle 4. The measurements were done with the ultraviolet flux standard BD+28D4211. No significant time dependence was found for wavelengths greater than 1200 Å on both sides; any accumulated sensitivity changes during Cycle 4 do not exceed about 2%, although the data indicate a decline rate per year of this magnitude. Below 1200 Å the sensitivity decreases with time. In April 1995 the sensitivity at 1140 Å was 10% lower than measured in April 1994.

Stability of the GHRS Sensitivity During Cycle 4
Abstract
1. - Introduction
2. - Observations
3. - Results for Side 1 (1100-1350 Å)
4. - Results for Side 1 (1350-1640 Å)
5. - Results for Side 2 (1200-3000 Å)
6. - Conclusions

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