Detection of ultrahighenergy cosmic rays

Matter accelerated to extremely high energies also arrives in the Earth's vicinity. Apart from the commonplace cosmic rays in the 1010eV range, there are astounding cosmic ray particles above 1019 eV, more than a million times more powerful than anything produced by accelerators on the ground. If they hit the Earth, they create very extensive showers of particles and make the atmosphere glow by fluorescence and Cherenkov radiation.

Ground facilities, including the large Auger array in Argentina, observe the extensive air showers from the ground, but they are limited by the local horizon. A space detector for ultra-high-energy cosmic rays looking down from low Earth orbit could witness the events around a much larger swath. It would need a large-aperture telescope and sensitive light detectors in

Figure successive year-round positions of the three spacecraft of the ESA-NASA LISA mission (2014), which will trail the Earth in its orbit around the Sun. Very slight changes in the 5 million-km separations, measured with laser beams, will reveal passing gravitational waves.

the near-ultraviolet and blue region of the spectrum.Table comments briefly on these topics.

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