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lofar - Swedish Institute of Space Physics - Uppsala

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Ultra-High Energy Cosmic Rays<br />

● CR mostly protons<br />

● Highest energy observed<br />

● F ~ E -2.75 up to 10 15 eV<br />

● After knee steeper, F ~ E -3<br />

● Origin <strong>of</strong> UHECR unknown<br />

● Flux obfuscated by B<br />

10 20 eV ≈ 16 J proton <br />

100 km/h Golf ball (!)<br />

Bo Thidé 52<br />

EISCAT Radar School, Kiruna,, 2005

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