排序方式: 共有6条查询结果,搜索用时 15 毫秒
1
1.
Felix Aharonian Andrei Bykov Etienne Parizot Vladimir Ptuskin Alan Watson 《Space Science Reviews》2012,166(1-4):97-132
We briefly review sources of cosmic rays, their composition and spectra as well as their propagation in the galactic and extragalactic magnetic fields, both regular and fluctuating. A special attention is paid to the recent results of the X-ray and gamma-ray observations that shed light on the origin of the galactic cosmic rays and the challenging results of Pierre Auger Observatory on the ultra high energy cosmic rays. The perspectives of both high energy astrophysics and cosmic-ray astronomy to identify the sources of ultra high energy cosmic rays, the mechanisms of particle acceleration, to measure the intergalactic radiation fields and to reveal the structure of magnetic fields of very different scales are outlined. 相似文献
2.
Vladimir Ptuskin Svetlana Rogovaya Vladimir Zirakashvili 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2013
The cosmic ray source spectrum produced by AGN (active galactic nucleus) jets is calculated. A distinctive feature of these calculations is the account for the jet distribution on kinetic energy. The expected cosmic ray spectrum at the Earth is determined with the use of a simple numerical code which takes into account interactions of ultra-high energy protons and nuclei with the background radiation in an expanding universe. 相似文献
3.
Klecker B. Mewaldt R.A. Bieber J.W. Cummings A.C. Drury L. Giacalone J. Jokipii J.R. Jones F.C. Krainev M.B. Lee M.A. Le Roux J.A. Marsden R.G. Mcdonald F.B. McKibben R.B. Steenberg C.D. Baring M.G. Ellison D.C. Lanzerotti L.J. Leske R.A. Mazur J.E. Moraal H. Oetliker M. Ptuskin V.S. Selesnick R.S. Trattner K.J. 《Space Science Reviews》1998,83(1-2):259-308
We review the observed properties of anomalous cosmic rays and the present status of our knowledge of the processes by which they originate. We compiled a comprehensive set of ACR energy spectral data from various spacecraft throughout the heliosphere during the passes of Ulysses over the poles of the Sun and present first results of a detailed modeling effort. In several contributions, we discuss the questions of injection and possible pre-acceleration of pickup ions, summarize new observations on the ionic charge composition, and present new results on the composition of minor ions in ACRs. 相似文献
4.
V.S. Ptuskin V.N. ZirakashviliA.A. Plesser 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2008
The propagation of cosmic rays in the interstellar medium after their release from the sources – supernova remnants – can be attended by the development of streaming instability. The instability creates MHD turbulence that changes the conditions of particle transport and leads to a non-linear diffusion of cosmic rays. We present a self-similar solution of the equation of non-linear diffusion for particles ejected from a SNR and discuss how obtained results may change the physical picture of cosmic ray propagation in the Galaxy. 相似文献
5.
Secondary radioactive isotopes that are used for the determination of cosmic-ray age have relatively short decay lifetimes.
The measured abundance of these isotopes at low energies is representative of the cosmic-ray diffusion and the gas distribution
in a region of a few hundred parsecs around the Sun. We show how to determine the local cosmic-ray diffusion coefficient in
the Galaxy using the data on decaying cosmic-ray nuclei. Calculated surviving fractions of decaying secondary isotopes in
diffusion and leaky box models are presented.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
6.
Vladimir S. Ptuskin 《Space Science Reviews》2001,99(1-4):281-293
The problems of cosmic-ray transport in the Galaxy are discussed. The discussion covers the diffusion model of cosmic ray propagation in the Galaxy, the dynamical effects of relativistic particles in the interstellar medium, and the origin of ultra high energy cosmic rays. 相似文献
1