NASA Aura

NASA Aura
Name	Aura
Mission type	Earth observation
Operator	NASA
Cospar id	2004-026A
Satcat	28371
Manufacturer	Northrop Grumman Aerospace Systems
Launch mass	2100 kg
Power	2,300 W
Launch date	15 July 2004
Launch rocket	Delta II 7920-10L
Launch site	Vandenberg Air Force Base
Orbit reference	Geocentric
Orbit regime	Sun-synchronous
Instruments	HIRDLS, MLS, OMI, TES

NASA Aura is a multi-instrument Earth observation satellite in NASA's Earth Science Division fleet designed to study atmospheric chemistry and composition. Launched in 2004 as part of the A-Train constellation, Aura carries four principal payloads to measure trace gases, aerosols, and temperature structure in the stratosphere and troposphere. Its data have been central to research on ozone depletion, air quality, climate forcing, and long-range transport of pollutants.

Overview

Aura was developed under the direction of the Goddard Space Flight Center in partnership with contractors including Northrop Grumman, with instrument contributions from institutions such as the Jet Propulsion Laboratory, the Netherlands Institute for Space Research, the Finnish Meteorological Institute, and the University of Oxford. As a component of the Afternoon Constellation (A-Train) alongside platforms like Aqua, CloudSat, and CALIPSO, Aura provided synergistic observations enabling studies linking ozone layer chemistry, aerosol particles, and greenhouse gas distributions. The mission bridged research priorities set by reports from bodies including the Intergovernmental Panel on Climate Change and assessments by the World Meteorological Organization and the United Nations Environment Programme.

Mission Objectives

Primary objectives targeted diagnostics of stratospheric ozone, tropospheric pollutants, and interactions among chemistry, radiation, and dynamics. Specific goals included quantifying global distributions of ozone, nitrogen dioxide, sulfur dioxide, formaldehyde, and carbon monoxide to improve chemical transport models developed at centers like the National Center for Atmospheric Research and the European Centre for Medium-Range Weather Forecasts. Aura aimed to constrain radiative forcing estimates relevant to assessments by the Intergovernmental Panel on Climate Change and to support compliance monitoring for instruments used in studies referenced by the Montreal Protocol and amendments. The mission also served algorithm development needs at institutions such as the Laboratory for Atmospheres and the Pacific Northwest National Laboratory.

Spacecraft and Instruments

Aura's payload comprised four flagship instruments: the High Resolution Dynamics Limb Sounder (HIRDLS) built by teams including Imperial College London and Jet Propulsion Laboratory; the Microwave Limb Sounder (MLS) led by the Jet Propulsion Laboratory and collaborators at University of Colorado Boulder; the Ozone Monitoring Instrument (OMI) developed by the Netherlands Institute for Space Research and Finnish Meteorological Institute with contributions from Royal Netherlands Meteorological Institute; and the Tropospheric Emission Spectrometer (TES) supplied by Jet Propulsion Laboratory and the California Institute of Technology. These instruments provided complementary measurement techniques: limb sounding, nadir spectroscopy, and hyperspectral infrared sounding, enabling cross-validation with other missions like OCO-2 and Suomi NPP as well as with ground-based networks operated by the World Meteorological Organization and the NASA AERONET program.

Launch and Orbit

Launched on a Delta II rocket from Vandenberg Air Force Base into a sun-synchronous polar orbit, Aura joined the A-Train constellation to achieve coordinated overpasses with platforms such as Aqua and PARASOL. The sun-synchronous orbit enabled consistent local solar time observations critical for diurnal cycle studies conducted by teams at institutions including Columbia University and Massachusetts Institute of Technology. Orbital parameters facilitated limb and nadir viewing geometries used by the MLS and OMI teams for vertical profiling and column retrievals, with station-keeping and operations managed by flight controllers at Goddard Space Flight Center.

Scientific Results and Discoveries

Aura datasets led to advances in understanding stratospheric ozone recovery, identifying trends tied to emissions reductions under the Montreal Protocol and linking interannual variability to phenomena like El Niño–Southern Oscillation and the Quasi-Biennial Oscillation. OMI observations revealed global patterns of nitrogen dioxide and sulfur dioxide emissions, supporting air quality assessments in regions including East Asia, Europe, and North America and studies by the Environmental Protection Agency. TES and MLS contributed to improved estimates of tropospheric carbon monoxide and ozone precursors, informing chemical transport model intercomparisons by the Atmospheric Chemistry and Climate Model Intercomparison Project. Aura helped quantify aerosol radiative effects and interactions between smoke from events such as the Southeast Asian biomass burning and regional monsoon systems analyzed by the Indian Institute of Tropical Meteorology. The mission produced long-term records used in many peer-reviewed studies at institutions like Harvard University, University of Cambridge, and Princeton University.

Operations and Collaborations

Mission operations were coordinated by teams at the Goddard Space Flight Center with science support from the Aura Project Science Office and international partners at agencies such as the European Space Agency, the Canadian Space Agency, and national research laboratories. Data distribution leveraged archives at the NASA Earth Observing System Data and Information System and facilitated community use through collaborations with model centers including the National Oceanic and Atmospheric Administration and research consortia like the Global Climate Observing System. Cross-mission calibration and validation campaigns engaged ground-based sites such as Mauna Loa Observatory and networks including the Network for the Detection of Atmospheric Composition Change to ensure the scientific integrity of long-term time series used in policy-relevant assessments.

Category:Earth observation satellites Category:NASA satellites launched in 2004