The UV air glow spectrometer was flown on the OGO-4 (Orbiting Geophysical Observatory 4) satellite on July 28, 1967, to provide global maps of atmospheric ozone. The OGO-4 satellite (also known as OGO-D, POGO 2) was a large observatory instrumented with experiments designed to study the interrelationships between the aurora and airglow emissions, energetic particle activity, geomagnetic field variation, ionospheric ionization and recombination, and atmospheric heating during the period of increased solar activity.
On October 23, 1969, the satellite was turned off. It was reactivated again in January 1970 for 2 months to obtain VLF observations (for additional information see J. E. Jackson and J.I. Vette, OGO Program Summary, NASA SP-7601, December 1975).
The UVspectrometer is an Ebert-Fastie scanning spectrometer. It was designed to make measurements of UV spectrum of the earth in the wavelength range from 1100 to 3400 A, with a 20-A resolution. The objectives were the determination of the vertical distribution of ozone from the nadir measurement of the back-scattered UV daylight in the 2000-to 3400-A range and the measurement of the intensity of the following emissions: (a) the hydrogen Lyman-alpha on both the day and night sides, (b) the atomic oxygen 1304-A day and twilight glow, and (c) the atomic oxygen 1356-A line, the atomic nitrogen 1493-A line, and the molecular nitrogen Lyman-Birge-Hopfield bands of the photoelectron excited dayglow.
Dr. Charles A. Barth (email@example.com) from the University of Colorado, was the Principal Investigator. A complete description of the UV experiment can be found in "OGO-IV ultraviolet airglow spectrometer," C. A. Barth and E. F. Mackey, IEEE Transactions on Geoscience Electronics, v. GE-7, n. 2, pp. 114-119, April 1969 .
The OGO-4 Ozone Profile Data Set was delivered to the NASA's NSSDC (National Space Science Data Center) by the principal investigator. This data set is available on the tape. However, this dataset (after rechecking the content) is also available on line via anonymous FTP from the NCAR-DSS site (http://dss.ucar.edu/datasets/).
Data Format: There are five records per profile:
- The first record in each set gives: the tape and record number; the date and time of the measurement (Greenwich and local mean times); the location of the satellite, and the sun's azimuth and zenith angles.
- The remaining four records: each contain four pairs of values. Each pair consists of the pressure (millibars) and the corresponding mixing ratio (gram per gram).
Data Period: September 1967 - January 1969
- For information about or assistance in using any GES DISC data, please contact
- EOS Distributed Active Archive Center (DAAC)
- Code 610.2
- NASA Goddard Space Flight Center
- Greenbelt, Maryland 20771
- e-mail: firstname.lastname@example.org
- 301-614-5224 (voice)
- 301-614-5268 (fax)
Barth, C. A. and E. F. Mackey, "OGO-IV ultraviolet airglow spectrometer," IEEE Transactions on Geoscience Electronics, GE-7, pp. 114-119, April 1969.
Anderson, G. P., Vertical distribution of ozone between 35 and 55 km as determined from satellite ultraviolet measurements, M.S. Thesis (U. of Colorado, Dept. of Astro-Geophysics., Boulder, CO, 1969.
Anderson, G. P., C. A. Barth, F. Cayla, and J. London, Satellite Observations of the vertical ozone distribution in the upper stratosphere, Ann. Geophys, 25, 341, 1969.
London, J., J. E. Frederick, and G. P. Anderson, Satellite Observations of the global distribution of stratospheric ozone, J. Geophys. Res. 82, 2543, 1977.