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Total Ozone Mapping Spectrometer (TOMS)

NSSDCA ID: 1996-037A-01

Mission Name: TOMS-EP


The objectives of the Total Ozone Mapping Spectrometer (TOMS) on the TOMS-Earth Probe (TOMS-EP) spacecraft were (1) to obtain high-resolution maps of global total ozone, (2) to measure long-term changes in ozone trends, (3) to obtain ozone information from the lower stratosphere, and (4) to detect sulfur dioxide clouds resulting from major volcanic eruptions. Ozone trends of 0.1 per cent per year were to be measured. The TOMS was similar to TOMS instruments flown on Nimbus-7, Meteor 3-5, and ADEOS. The TOMS instrument consisted of the Instrument Assembly, which included the Optics Module (OPM), Electronic Module (ELM), Diffuser Module, and baseplate; and, interface electronics and data recorder. The TOMS Optics Module consisted of a fore-optics unit, an f/5 250 mm focal length Ebert-Fastie ultraviolet spectrometer, and a photomultiplier. The Diffuser Module consisted of three diffuser plates (rather than the single SBUV plate on Nimbus-7) allowing observations of the backscattered solar radiation. Total ozone measurements were made by observing backscattered solar ultraviolet irradiance in 6 wavelength bands from 308.6 to 360 nm with a 1.0 nm bandpass. The nadir-viewing instrument scanned an adjustable cross-track swath in 3-degree steps, with scan rates adjusted to altitude for contiguous coverage with minimum overlap, producing 47 x 47 km global maps of total ozone with a swath width of 2752 km. The on-board data recorder, recorded TOMS measurements throughout the daylit portion of the orbit.

Alternate Names

  • TOMS

Facts in Brief

Mass: 30 kg
Power (avg): 21 W
Bit rate (avg): 0.7 kbps

Funding Agency

  • NASA-Office of Space Science Applications (United States)


  • Earth Science: Atmospheric Chemistry

Additional Information

Questions and comments about this experiment can be directed to: Coordinated Request and User Support Office



NameRoleOriginal AffiliationE-mail
Dr. Jay R. HermanExperiment Data ManagerNASA Goddard Space Flight
Dr. Arlin J. KruegerExperiment ScientistNASA Goddard Space Flight
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