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Astron. Astrophys. 350, L1-L4 (1999)

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Letter to the Editor

`Fine Structure' in the energy spectrum, and changes in the mass composition, of cosmic rays in the energy range 0.3-10 PeV

A.D. Erlykin 1,2 and A.W. Wolfendale 2

1 P.N. Lebedev Physical Institute, Leninsky Prospekt 53, 117924 Moscow, Russia
2 University of Durham, Physics Department, Durham, DH1 3LE, UK

Received 25 May 1999 / Accepted 6 September 1999


A recent publication by Arqueros et al. (1999), of data from the HEGRA and AIROBICC extensive air shower detector complex, updates earlier work with this apparatus (by Cortina et al., 1997). Our contention (Erlykin and Wolfendale, 1998) that the position of the knee in the primary energy spectrum had been located at too low an energy has been confirmed. The results on the `fine structure' of the energy spectrum, a concept first put forward by us (Erlykin and Wolfendale, 1997 - and developed in later papers) - and on the dependence of mean primary mass on energy, are quite compatible with our predictions. Indeed, the new results give rather strong support to our hypothesis.

Key words: acceleration of particles – ISM: cosmic rays

Send offprint requests to: A.W. Wolfendale@durham.ac.uk

© European Southern Observatory (ESO) 1999

Online publication: September 24, 1999