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SOFIA

The Stratospheric Observatory for Infrared Astronomy (SOFIA) is a joint project between NASA and DLR (German Aerospace Center). A 2.5 m dish is mounted on a modified Boeing 747 aircraft. The airborne observatory is planned to observe mainly in the far-infrared wavelength range.

These plots shows the transmission in percent for a pwv=5.2 micron against frequency for three selected frequency ranges. Each range represents a interesting atmospheric window in which important lines are found. For example, the 1460 GHz window includes the ionized nitrogen line ([NII]) at 1460.27 GHz, the 2670 GHz window the HD line at 2674.99 GHz, and the 4740 GHz line the ionized oxygen line ([OI]) at 4744.66 GHz. The frequency resolution is 10, 30, 60 MHz for the 1460,2670, and 4740 GHz windows.

1450-1471 GHz

2655-2695 GHz

4710-4780 GHz



Gzipped-ascii-files of data in two-column format. First column: Frequency in GHz, second column: Transmission (to get opacity take -ln(transmission)). The frequency resolution (df) is indicated for each model.
Frequency [GHz] 0-10000 (df=200 MHz) 1450-1471 (df=10 MHz) 2655-2695 (df=30 MHz) 4710-4780 (df=60 MHz)
pwv=0.052mm
sofia-1450-1471-0052 sofia-2655-2695-0052 sofia-4710-4780-0052
pwv=0.08mm



pwv=0.1mm





11-14km 1800-2000 GHz

11km 1800-2000 GHz 

11 km altitude


12km 1800-2000 GHz
12 km altitude
Frequency [GHz]1200-1500 (df=200 MHz)1800-2000 (df=200 MHz)


pwv=0.003mmsofia-12-1200-1500-3sofia-12-1800-2000-3

pwv=0.005mmsofia-12-1200-1500-5sofia-12-1800-2000-5



pwv=0.010mmsofia-12-1200-1500-10sofia-12-1800-2000-10

pwv=0.015mmsofia-12-1200-1500-15sofia-12-1800-2000-15
pwv=0.020mmsofia-12-1200-1500-20sofia-12-1800-2000-20








13km 1800-2000 GHz 

13 km altitude
Frequency [GHz]1200-1500 (df=200 MHz)1800-2000 (df=200 MHz)



pwv=0.005mmsofia-13-1200-1500-5sofia-13-1800-2000-5

pwv=0.010mmsofia-13-1200-1500-10sofia-13-1800-2000-10



pwv=0.015mm
pwv=0.003mm
sofia-13-1200-1500-15
sofia-13-1800-2000-15
sofia-13-1800-2000-3











14km 1800-2000 GHz

14 km altitude
Frequency [GHz]1200-1500 (df=200 MHz)1800-2000 (df=200 MHz)



pwv=0.003mmsofia-14-1200-1500-3sofia-14-1800-2000-3

pwv=0.005mmsofia-14-1200-1500-5sofia-14-1800-2000-5



pwv=0.010mmsofia-14-1200-1500-10sofia-14-1800-2000-10