IMAGE First Light
June 5, 2000 -- "First-light" pictures from NASA's Imager for Magnetopause to Aurora Global Exploration (IMAGE) spacecraft have revealed the global ebb and flow of hot, electrified gas (plasma) around the Earth in response to the solar wind. Severe disturbances in this region controlled by the Earth's magnetic field (the magnetosphere) are capable of disrupting satellites, telephone and radio communications, and power systems.
"IMAGE is the first weather satellite for space storms,"
said Dr. James L. Burch, Principal Investigator for IMAGE at
Southwest Research Institute, San Antonio, Texas. "This
revolutionary spacecraft makes these invisible storms visible.
In a sense, IMAGE allows us to view the Earth through plasma-colored
glasses. We eagerly anticipate the arrival of severe solar weather
associated with solar maximum, which we are now entering."
Above: This picture, recorded by IMAGE's Extreme Ultraviolet Imager, shows solar ultraviolet radiation scattered from ionized helium in the Earth's extended atmosphere. The ionized helium envelope is 2 to 3 times the size of the Earth. Irregularities at the fringe of the image (upper left) indicate magnetic storm activity. This is the first time such features have been imaged. This is a selected frame from a sequence which is available as a 1.6 Mb Quicktime movie.
Previous spacecraft explored the turbulent magnetosphere by detecting particles and fields in the immediate vicinity of the spacecraft. This technique limited their vision to small portions of this vast and dynamic region, which extends beyond the Moon on the Earth's night side.
"The old way of tracking magnetic storms is like trying to understand severe thunderstorms in the Midwest by driving around with a rain gauge out the window," said Dr. Thomas Moore, IMAGE Project Scientist at NASA's Goddard Space Flight Center, Greenbelt, Md. "With IMAGE, we will see the big picture, just like entire storm systems appear on the evening news with weather satellites."
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The first pictures from IMAGE were presented at a press conference during the spring meeting of the American Geophysical Union May 31 in Washington, D.C.
"These first images are an enticing glimpse at the spectacular results expected from IMAGE once we encounter really heavy weather in space," said Dr. James Green, Deputy Project Scientist for IMAGE at Goddard.
All spacecraft systems have been successfully deployed and are operating normally. All scientific instruments are operating as expected and are returning images.
The Radio Plasma Imager instrument provides a three-dimensional
view of the plasmasphere by sounding it with radio pulses, like
an ultrasound image of the human body. To accomplish this, it
uses the longest antennas ever deployed in space, longer than
the height of the Empire State Building.
Left: The Radio Plasma Imager (RPI) on IMAGE is the first-of-its-kind instrument designed to study the dynamics of the magnetosphere by using radar techniques. In order to generate very low frequency radio waves and to receive the resulting echoes, RPI uses very long dipole antennas. IMAGE has 2 spin-plane dipole antennas (along the spacecraft X and Y axis) and one spin-axis dipole antenna (along the spacecraft Z axis). The X and Y axis antennas are 1647 ft or 500 meters tip-to-tip each. These antennas are 182 ft longer than the height of the Empire State Building, making the IMAGE spacecraft the largest dipole antenna system currently in space. This is a selected frame from a sequence which is available as a 100 kb Quicktime movie.
A suite of three Neutral Atom Imaging instruments is recording the glow of fast atoms coming from throughout the Earth's magnetic field. This reveals the shape and motion of the clouds of plasma that make up a magnetic storm.
The Far Ultraviolet Imaging instrument
is collecting the first-ever images from space of the Earth's
proton aurora. The aurora, commonly known as the northern and
southern lights, is a ghostly light show seen most often at high
latitudes of Earth. The dance of lights that is visible from
the ground is caused by electrons striking and lighting up the
atmosphere much like electricity lights up a television screen.
The proton aurora is invisible to the naked eye and has never
been viewed from space; from the ground, it is visible only in
Right: Aurora are caused by the interaction of precipitating charged particles (electrons and ions) with the neutral gases of our atmosphere. Light from the Earth's aurora occur principally in two oval-shaped bands lying between ~65 and 75 degrees magnetic latitude and centered on the northern (aurora borealis) and southern (aurora australis) magnetic poles. IMAGE observes the aurora in several important wavelengths and has captured its first geomagnetic substorm (pictured above). These observations are caused by precipitating electrons. This is a selected frame from a sequence which is available as a 145 kb Quicktime movie.
Southwest Research Institute manages the IMAGE project and leads the IMAGE science investigation. The IMAGE Principal Investigator is James L. Burch.Web Links
IMAGE First Light Movies and Pictures - from NASA/GSFC
Space Weather Satellite Blasts Off -- March 27, 2000