Scientists study Jupiter to understand magnetic substorms on Earth.Byline: ANI
Paris, Dec 6 (ANI): The European Space Agency's (ESA's) Cluster satellites have studied the mysterious magnetic substorms on Earth and compared it with similar phenomenon on the giant planet Jupiter for a better understanding.
Magnetic substorms on Earth disrupt orbiting satellites, including telecommunication satellites and global positioning systems.
During a magnetic substorm on Earth, particles located tens of thousands kilometres on the nightside Nightside may refer to:
adv. & adj.
To or toward the earth.
earthwards adv. within a few minutes.
This creates colourful aurorae au·ro·rae
A plural of aurora. and excites the near-Earth environment, disrupting communications between Earth and orbiting satellites and affecting global positioning systems.
Despite decades of space-based research, several aspects of this phenomenon remain unknown.
One such unknown aspect is the mechanism that triggers these storms: it is not clear whether the storms are caused by processes internal to the magnetosphere magnetosphere: see Van Allen radiation belts.
Region around a planet (such as Earth) or a natural satellite that possesses a magnetic field (see or by other external processes (solar origin).
Dr Elena Kronberg and colleagues at the Max Planck institute for Solar System Research The Max Planck Institute for Solar System Research (abbreviation: MPS; German: Max-Planck-Institut für Sonnensystemforschung) is part of the Max Planck Society which operates 80 research facilities in Germany. , Germany, decided to look away from Earth, to other planets, to see if they could learn something new.
On Earth, a periodic substorm shows a gradual decrease followed by a rapid increase in the amount of particles that are hurled earthward.
One such cycle takes 2-3 hours.
At Jupiter, the same cycle takes 2-3 days. This duration is longer partly because of Jupiter's stronger magnetic field and larger magnetosphere.
The jovian magnetic field is so large that Jupiter's magnetosphere Jupiter has a very large and powerful magnetosphere. In fact, if one could see Jupiter's magnetic field from Earth, it would appear five times as large as the full moon in the sky despite being so much farther away. envelopes the planet's galilean moons The Galilean moons are the four moons of Jupiter discovered by Galileo Galilei. They are by far the largest of the many moons of Jupiter. Discovery
The Galilean moons were first observed by Galileo on January 7, 1610. : Io, Europa, Ganymede and Calisto.
After detailed analyses of data from several missions, Dr Kronberg said, "We've found that at Earth and Jupiter, the magnetic field undergoes the same three steps during a substorm: growth, expansion and recovery."
Kronberg and colleagues studied data from NASA's Galileo spacecraft.
In 2007, they reported that periodic substorms at Jupiter were connected to the constant release of matter by the jovian satellite Io, which lies inside the jovian magnetosphere.
This release of matter forms part of the mechanism that triggers the substorm. This means that the driver of this phenomenon is internal to the jovian magnetosphere.
Extrapolating this mechanism to the terrestrial magnetosphere, Kronberg and colleagues propose that under certain conditions, periodic magnetospheric substorms at Earth may be driven internally by plasma eroded from the plasmasphere, a region of Earth's magnetosphere.
This feeds the magnetosphere, providing the matter required to trigger a substorm.
According to according to
1. As stated or indicated by; on the authority of: according to historians.
2. In keeping with: according to instructions.
3. Philippe Escoubet, ESA's Cluster Project Scientist, "With Cluster, we've gained a better understanding of the processes taking place inside Earth's magnetosphere. This has enhanced our understanding of how our Solar System works. And now, we're delighted to learn more from gigantic Jupiter itself." (ANI)
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