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Cosmic ray physics and AUGER latest results

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6<br />

“Spontaneous” discharge!<br />

■<br />

1901: Wilson notices that discharge is identical on the<br />

ground <strong>and</strong> underground (~7 div/hour)<br />

■<br />

Rutherford shows that<br />

natural radioactivity (ground<br />

<strong>and</strong> contaminated apparatus)<br />

is responsible<br />

3.5 ions/cm 3<br />

(instead of<br />

0.4 ions/cm 3<br />

expected)<br />

■<br />

1910: Theodore Wulf (Jesuit <strong>and</strong> amateur<br />

physicist who builds the best electrometers)<br />

works on the top of the Eiffel tower<br />

6 ions/cm 3<br />

Paris, 9 th June 2008 — IDAPPʼs two days 2008 — E. Parizot (APC / Univ. Paris 7)

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