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Cluster listens to the sounds of Earth

27 June 2008

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Artist's impression of the Cluster constellation

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Artist's impression of the Cluster constellation.

ESA's mission Cluster consists of four identical spacecraft flying in formation between 19 000 and 119 000 km above the Earth. They study the interaction between the solar wind and Earth’s magnetosphere, or the Sun-Earth connection in 3D.

Credits: ESA

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Earth's chirps and whistles, click on the top right to listen.

Credits: ESA

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Animation depicting the four Cluster satellites as Auroral Kilometric Radiation (AKR) washed over them. AKR is generated high above the Earth, by the same shaft of solar particles that then causes an aurora to light the sky beneath.

By analysing 12 000 separate bursts of AKR recorded by Cluster, a team of astronomers have determined that the AKR is beamed into space in a narrow plane. For each of the AKR bursts analysed, astronomers pinpointed its point of origin to regions in Earth’s magnetic field just a few tens of kilometres in size. These were located a few thousand kilometres above where the light of the aurora is formed.

This was only possible because of the Cluster constellation's four spacecraft flying in formation that could be used to locate the points of origin by triangulation.

Credits: ESA (Adapted from Mutel et al., 2003)

More about...

Cluster overview Double Star overview SOHO overview Solar Orbiter Space weather

Solitary waves in translation New discovery on magnetic reconnection to impact future space missions High-speed beams of charged particles accelerate towards Earth Solar outburst pulls a magnetic slingshot Cluster monitors convection cells over the polar caps Cluster and Double Star uncover more on bright aurorae Killer electrons in space are now less mysterious

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