Speaker
Igor Petrov
(Yu. G. Shafer Institute of Cosmophysical Research and Aeronomy)
Description
The experimental data on the energy spectrum cosmic rays, obtained from Small Cherenkov Array in Yakutsk on the measurement of Cherenkov radiation in showers with energy 10^15 – 10^18 eV are discussed. The data were obtained by means of continuous array operation since 1994. Found that the spectrum of the all particle in this energy region has a complex shape and cannot be described by a simple exponential function with a single slope indicator g. After the first kink at energy 3•10^15 eV (knee), the spectrum becomes steeper at Dg = 0.4 to energy < 2•10^16 eV, then part of the spectrum to > 8•10^16 eV becomes flat, the slope of the spectrum is g = 2.92 ± 0.03 and then again changes slope to Dg = 0.32 ± 0.05, since about energy ~2•10^17 eV. The second kink in the spectrum observed at the Yakutsk EAS array at ~2•10^17 eV, or also called second knee is the significant result for space astrophysics of ultra-high cosmic rays. In this paper we discuss possible scenarios for spectrum formation of cosmic rays by the galactic sources to energies < 10^17 eV, mainly supernovae remnants SNR and Metagalactic origins in the energy range 10^17 – 10^18 eV. Most likely, that measurement of second knee is related with transitional region, galactic to extragalactic origin of cosmic rays.
| Registration number following "ICRC2015-I/" | 273 |
|---|---|
| Collaboration | -- not specified -- |
Primary author
Stanislav Knurenko
(Yu. G. Shafer Institute of Cosmophysical Research and Aeronomy)
Co-author
Igor Petrov
(Yu. G. Shafer Institute of Cosmophysical Research and Aeronomy)
