End-to-End Performance

1. Transmission and/or reflectance of all appropriate optical elements,
2. Quantum Efficiency of the CCD detector,
3. Clear Aperture of the UV Channel, and
4. Solid Angle per pixel.

Notes:

• The units on these curves are the product of the above combination of transmissions, reflectances, quantum efficiencies and geometric factors. When these units are multiplied against a solar radiance, the result is a ``spectral count rate'' in units of electrons/pixel/Å/sec.
• At first glance, the curves look strange. An extreme case is the Ly Alpha curve, which is dual-peaked. This is a result of the product of a Lyman Alpha filter peaked at 1216 Å and the multilayer coating on the primary mirror which peaks at 1550 Å.
• To ease the concern associated with this previous point, we include curves of sample solar spectra folded through the TRACE instrument in all channels. The spectrum used here is a curve derived from several sources:
  1. The high spectral resolution wavelengths from 1445 Å to 1680 Å is data from the HRTS mission; c.f. Brekke, 1993, ApJ. Suppl., 87, 443. This data is an ``Active Region Spectrum'' from the above paper.
  2. The lower resolution spectrum from 1200-1800 Å is from the SOLSTICE instrument; e.g. Rottman et al, 1993, J. Geophys. Res., 98, 10667. This is an irradiance spectrum averaged over the full disk. This data was further scaled to match the UV continuum intensity of the Brekke spectrum.
• The results generated by the above curves are in units of electrons/pixel/Å/sec. Note this must then be multiplied by an appropriate factor depending on which CCD amplifier is used; Amplifier ``A'' is 14 electrons/DN while Amplifier ``B'' is approximately 53 electrons/DN.

• H I Lyman Alpha Response:
  • Full Curve
  • Expanded Curve
  • Sample Spectra
• C IV 1550 Å Response
  • Full Curve
  • Expanded Curve
  • Sample Spectra
• UV Continuum (1600 Å and 1700 Å) Response
  • Full Curve
  • Expanded Curve
  • Sample Spectra
• White Light Continuum Response
  • Full Curve
  • Sample White Spectra
• Visible Calibration notes from Stimulus Telescope
• Comparison of visible thruput on different Quadrants
• 1550 Å visible throughput calculated during spacecraft-level Thermal Balance test