AKA: Imager for Magnetopause-to-Aurora Global Exploration. Status: Operational 2000. First Launch: 2000-03-25. Last Launch: 2000-03-25. Number: 1 . Gross mass: 494 kg (1,089 lb). Height: 1.52 m (4.98 ft). Span: 250.00 m (820.00 ft).
These allowed detailed study of the interaction of the solar wind with the magnetosphere and the magnetosphere's response during a magnetic storm.
IMAGE was the first of its kind, designed to actually "see" most of the major charged particle systems in the space surrounding Earth. Previous spacecraft explored the magnetosphere by detecting particles and fields they encountered as they passed through them. This technique limited their "vision" to small portions of this vast and dynamic field, which extends about 40,000 miles on Earth's day side and about 110,000 miles on Earth's night side. It would be similar to attempt understanding the nature of the world's oceans from a single buoy.
Just as taking a photograph of the night sky allows astronomers to count and study millions of stars at once, images returned by the IMAGE spacecraft were to provide simultaneous measurements of the densities, energies and masses of charged particles throughout the inner magnetosphere using three-dimensional imaging techniques.
During its two-year mission, the half-ton IMAGE spacecraft was to image remote particle populations in the magnetosphere. These "photographs" would then be linked together to make movies in real time. Their rapid two-minute cadence was to allow detailed study of the interaction of the solar wind with the magnetosphere and the magnetosphere's response during a magnetic storm, which typically lasted a few days. IMAGE also used a real-time down link to the National Oceanic and Atmospheric Administration for space weather forecasting
IMAGE employed six instruments along with a data processor:
Lockheed Martin Missiles and Space of Lockheed, Calif. built the IMAGE spacecraft under contract with SwRI. On orbit, the RPI antennas aboard IMAGE extended 10 m parallel to the spin axis and 250 m in four directions perpendicular to the spin axis, making IMAGE the longest spacecraft then in orbit. Electric System: 0.286 average kW.
NASA NSSDC Master Catalog Description
IMAGE (Imager for Magnetopause-to-Aurora Global Exploration) was a MIDEX class mission, selected by NASA in 1996, to study the global response of the Earth's magnetosphere to changes in the solar wind. IMAGE was launched March 25, 2000 into a highly elliptical polar orbit with initial geocentric apogee of 8.2 Earth radii and perigee altitude of 1000 km. IMAGE used neutral atom, ultraviolet, and radio imaging techniques to: (a) identify the dominant mechanisms for injecting plasma into the magnetosphere on substorm and magnetic storm time scales; (b) determine the directly driven response of the magnetosphere to solar wind changes; and, (c) discover how and where magnetospheric plasmas are energized, transported, and subsequently lost during substorms and magnetic storms.
In order to fulfill its science goals, IMAGE utilized neutral atom, ultraviolet, and radio imaging techniques. A suite of three neutral atom imagers (NAI) provided energy- and composition-resolved images at energies from 10 eV to 200 keV with a time resolution of 300 seconds. Two ultraviolet imagers, covering wavelength ranges from 120-180 nm (FUV) and 30.4 nm (EUV), provided coverage in the far and extreme ultraviolet. The radio plasma imager (RPI) was a low-power radar which operated in the radio frequency bands which contain the plasma resonance frequencies characteristic of the Earth's magnetophere (3 kHz to 3 MHz).
On December 18, 2005, after 5.8 years of successful operations, IMAGE's telemetry signals were not received during a routine pass. Preliminary analysis indicated that IMAGE's solid state power controller (SSPC) on the 28V line from the power distribution unit (PDU) to the transponder is reading closed, but is actually open resulting in having no power to the transponder to get a command to the PDU to close it. The only thing that might close it would be a PDU power cycle. It is possible that the next mega-eclipse cycle in October 2007, may drain the battery and voltage enough to cause this to happen enabling IMAGE to be recovered. For more details on the legacy of the IMAGE mission see the NASA press release at
Credit: Manufacturer Image
Imager for Magnetopause to Aurora Global Exploration was a MIDEX (mid-sized Explorer mission) developed by NASA-Goddard and the SWRI (Southwest Research Institute) of San Antonio, Texas. The spin-stabilised spacecraft carried a set of neutral atom and ultraviolet imagers, and antennae to study radio wavelength emissions from the magnetosphere plasma. The RPI radio plasma imager has four long wire antennae which will be deployed to a span of half a kilometre.