International School of Cosmic Ray Astrophysics

16^th  Course: "Gamma Ray and Cosmic Ray Astrophysics: From below GeV to beyond EeV Energies"

 5-12 July 2008
Ettore Majorana Centre
Erice, Sicily, Italy

Topic: Cosmic Rays from the Knee to the Ankle
Lecturer: Gaurang B. Yodh, Physics and Astronomy, UC Irvine

This lecture will discuss results from different techniques of measuring the energy spectra of cosmic rays beyond the Knee. Special attention will be on the significance and nature of changes in the spectral slope and elemental composition of cosmic rays with the aim of answering the questions:

(1) Is the cosmic ray elemental mix changing with energy ?
(2) Is there evidence for the end of the galactic cosmic ray spectrum? and
(3) What can one say about origin, acceleration and propagation of these cosmic rays ?