Overview
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 Instrument
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 (charels.barth@colorado.edu)
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
Science questions concerning the production and validation of this data
set should be directed to:
- Dr. Suraiya Ahmad
- GES DISC DAAC
- NASA Goddard Space Flight Center
- Greenbelt, MD 20771
- e-mail: suraiya.ahmad@nasa.gov
- 301-614-5284 (voice)
- 301-614-5268 (fax)
-
- For information about or assistance in using any DAAC data, please contact
-
- EOS Distributed Active Archive Center (DAAC)
- Code 610.2
- NASA Goddard Space Flight Center
- Greenbelt, Maryland 20771
- e-mail: help-disc@listserv.gsfc.nasa.gov
-
- 301-614-5224 (voice)
- 301-614-5268 (fax)
References
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.
(more Publications)
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Atmos Composition
