Space Telescope Imaging Spectrograph Instrument Handbook for Cycle 17

6.6 Tabular Sky Backgrounds

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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 m_V = 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	High Earthshine erg sec-1 cm-2 Å-1 arcsec-2	High Zodiacal Light erg sec-1 cm-2 Å-1 arcsec-2	Total Background erg sec-1 cm-2 Å-1 arcsec-2
1000	2.41e-23	9.69e-29	2.41e-23
1100	4.38e-22	1.04e-26	4.38e-22
1200	4.01e-23	1.08e-25	4.03e-23
1300	7.41e-25	6.59e-25	1.40e-24
1400	4.29e-25	2.55e-24	2.98e-24
1500	4.16e-25	9.73e-24	1.01e-23
1600	2.55e-25	2.35e-22	2.35e-22
1700	7.89e-25	7.21e-21	7.21e-21
1800	9.33e-23	1.53e-20	1.54e-20
1900	4.39e-22	2.25e-20	2.29e-20
2000	1.01e-21	3.58e-20	3.68e-20
2100	1.60e-21	1.23e-19	1.25e-19
2200	7.49e-22	2.21e-19	2.22e-19
2300	3.32e-22	1.81e-19	1.81e-19
2400	2.50e-22	1.83e-19	1.83e-19
2500	2.39e-22	2.53e-19	2.53e-19
2600	5.62e-22	3.06e-19	3.06e-19
2700	6.77e-21	1.01e-18	1.02e-18
2800	2.03e-21	2.88e-19	2.90e-19
2900	4.32e-20	2.08e-18	2.12e-18
3000	9.34e-20	1.25e-18	1.35e-18
3100	2.07e-19	1.50e-18	1.70e-18
3200	3.60e-19	2.30e-18	2.66e-18
3300	4.27e-19	2.95e-18	3.38e-18
3400	6.40e-19	2.86e-18	3.50e-18
3500	8.20e-19	2.79e-18	3.61e-18
3600	1.06e-18	2.74e-18	3.80e-18
3700	1.22e-18	3.32e-18	4.54e-18
3800	1.23e-18	3.12e-18	4.35e-18
3900	1.52e-18	3.34e-18	4.86e-18
4000	2.38e-18	4.64e-18	7.01e-18
4250	2.38e-18	4.65e-18	7.03e-18
4500	2.86e-18	5.58e-18	8.44e-18
4750	2.79e-18	5.46e-18	8.25e-18
5000	2.63e-18	5.15e-18	7.77e-18
5250	2.67e-18	5.37e-18	8.04e-18
5500	2.58e-18	5.34e-18	7.92e-18
5750	2.54e-18	5.40e-18	7.94e-18
6000	2.42e-18	5.25e-18	7.67e-18
6250	2.26e-18	5.02e-18	7.28e-18
6500	2.17e-18	4.92e-18	7.09e-18
6750	2.07e-18	4.79e-18	6.87e-18
7000	1.93e-18	4.55e-18	6.48e-18
7250	1.85e-18	4.43e-18	6.29e-18
7500	1.74e-18	4.23e-18	5.97e-18
7750	1.63e-18	4.04e-18	5.67e-18
8000	1.56e-18	3.92e-18	5.49e-18
8250	1.48e-18	3.76e-18	5.23e-18
8500	1.35e-18	3.50e-18	4.85e-18
8750	1.31e-18	3.43e-18	4.74e-18
9000	1.22e-18	3.23e-18	4.44e-18
9250	1.15e-18	3.07e-18	4.21e-18
9500	1.10e-18	2.98e-18	4.08e-18
9750	1.04e-18	2.86e-18	3.91e-18
10000	1.00e-18	2.78e-18	3.78e-18
10250	9.54e-19	2.67e-18	3.63e-18
10500	9.04e-19	2.56e-18	3.46e-18
10750	8.41e-19	2.41e-18	3.25e-18
11000	8.03e-19	2.31e-18	3.11e-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 × 10-13	~10	3.05 × 10-13	2	6.1 × 10-14
1302 + 1306	O I	0.013	~2	5.7 × 10-14	~1	2.85 × 10-14	0.013	3.8 × 10-16
1356	O I]	0.013	~0.2	5 × 10-15	~0.1	2.50 × 10-15	~ 0.001	3 × 10-17
2471	[O II]	0.023	< 0.2	3 × 10-15	<0.1	1.50 × 10-15	< 0.001	1.5 × 10-17