STScI

Space Telescope Imaging Spectrograph Instrument Handbook for Cycle 14

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6.6 Tabular Sky Backgrounds

We provide a table of the "high" sky background numbers as plotted in Figure 6.1, for easy reference. See the text and the caption in Figure 6.1 for more details. The high sky values are defined as the earthshine at 38° from the limb and by the high zodiacal light of mV = 22.1 arcsec-2. The contributions of the geocoronal emission lines are tabulated separately in Table 6.5.


Table 6.4: High Sky Background (excluding geocoronal emission lines)
Wavelength
Å
 
Earthshine
erg sec-1 cm-2
Å-1 arcsec-2
Zodiacal Light
erg sec-1 cm-2
Å-1 arcsec-2
Total Background
erg sec-1 cm-2
Å-1 arcsec-2
1000
1.32E-22
2.56E-28
1.32E-22
1100
3.38E-22
1.37E-26
3.38E-22
1200
8.25E-23
1.27E-25
8.26E-23
1300
5.41E-24
6.88E-25
6.10E-24
1400
4.65E-25
2.68E-24
3.14E-24
1500
3.97E-25
4.60E-23
4.64E-23
1600
3.42E-25
2.32E-22
2.33E-22
1700
1.24E-23
6.49E-21
6.50E-21
1800
1.26E-22
1.35E-20
1.37E-20
1900
4.69E-22
2.13E-20
2.18E-20
2000
1.02E-21
4.22E-20
4.32E-20
2100
1.42E-21
1.21E-19
1.22E-19
2200
8.02E-22
2.00E-19
2.01E-19
2300
3.73E-22
1.97E-19
1.97E-19
2400
2.59E-22
2.14E-19
2.14E-19
2500
2.80E-22
2.05E-19
2.06E-19
2600
1.29E-21
4.73E-19
4.75E-19
2700
5.42E-21
8.26E-19
8.31E-19
2800
7.72E-21
7.48E-19
7.56E-19
2900
4.43E-20
1.52E-18
1.56E-18
3000
1.01E-19
1.72E-18
1.82E-18
3100
2.12E-19
1.92E-18
2.14E-18
3200
3.50E-19
2.24E-18
2.59E-18
3300
4.45E-19
2.72E-18
3.17E-18
3400
6.36E-19
2.65E-18
3.28E-18
3500
8.28E-19
2.67E-18
3.50E-18
3600
1.05E-18
2.53E-18
3.58E-18
3700
1.20E-18
3.03E-18
4.23E-18
3800
1.26E-18
2.87E-18
4.13E-18
3900
1.59E-18
2.83E-18
4.42E-18
4000
2.33E-18
4.22E-18
6.55E-18
4250
2.31E-18
4.42E-18
6.73E-18
4500
2.70E-18
5.16E-18
7.86E-18
4750
2.75E-18
5.23E-18
7.98E-18
5000
2.65E-18
5.10E-18
7.75E-18
5250
2.56E-18
5.02E-18
7.58E-18
5500
2.55E-18
5.16E-18
7.71E-18
5750
2.53E-18
5.25E-18
7.78E-18
6000
2.43E-18
5.14E-18
7.57E-18
6250
2.31E-18
5.00E-18
7.31E-18
6500
2.18E-18
4.80E-18
6.98E-18
6750
2.08E-18
4.69E-18
6.77E-18
7000
1.94E-18
4.48E-18
6.42E-18
7250
1.83E-18
4.30E-18
6.13E-18
7500
1.74E-18
4.13E-18
5.87E-18
7750
1.64E-18
3.97E-18
5.62E-18
8000
1.56E-18
3.83E-18
5.39E-18
8250
1.48E-18
3.68E-18
5.15E-18
8500
1.38E-18
3.47E-18
4.84E-18
8750
1.30E-18
3.31E-18
4.61E-18
9000
1.22E-18
3.17E-18
4.40E-18
9250
1.15E-18
3.03E-18
4.18E-18
9500
1.10E-18
2.92E-18
4.02E-18
9750
1.05E-18
2.81E-18
3.86E-18
10000
9.99E-19
2.70E-18
3.70E-18
10250
9.48E-19
2.60E-18
3.55E-18
10500
8.99E-19
2.49E-18
3.39E-18
10750
8.42E-19
2.36E-18
3.20E-18
11000
8.02E-19
2.24E-18
3.04E-18


Table 6.5: Geocoronal (Airglow) Emission Lines
Wavelength
(Å)
ID
Line Width (Å)
Intensity
High
Average
Low
kilo-
Rayleighs
erg s-1 cm-2 arcsec-2
kilo-
Rayleighs
erg s-1 cm-2 arcsec-2
kilo-
Rayleighs
erg s-1 cm-2 arcsec-2
1216
Ly
0.04
~20
6.1 x 10-13
~10
3.05 x 10-13
2
6.1 x 10-14
1302 + 1306
O I
0.013
~2
5.7 x 10-14
~1
2.85 x 10-14
0.013
3.8 x 10-16
1356
O I]
0.013
~0.2
5 x 10-15
~0.1
2.50 x 10-15
~ 0.001
3 x 10-17
2471
[O II]
0.023
< 0.2
3  x 10-15
<0.1
1.50 x 10-15
< 0.001
1.5 x 10-17

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