Zobrazeno 1 - 10
of 383
pro vyhledávání: '"Sagdeev, R Z"'
How Electron Two-Stream Instability Drives Cyclic Langmuir Collapse and Continuous Coherent Emission
Continuous plasma coherent emission is maintained by repetitive Langmuir collapse driven by the nonlinear evolution of a strong electron two-stream instability. The Langmuir waves are modulated by solitary waves in the linear stage, and by electrosta
Externí odkaz:
http://arxiv.org/abs/1702.00784
Publikováno v:
Phys. Rev. D 94, 063006 (2016)
The unexpected energy spectrum of the positron/electron ratio is interpreted astrophysically, with a possible exception of the 100-300 GeV range. The data indicate that this ratio, after a decline between $0.5-8$ GeV, rises steadily with a trend towa
Externí odkaz:
http://arxiv.org/abs/1607.01820
Autor:
Malkov, M. A., Sagdeev, R. Z., Dudnikova, G. I., Liseykina, T. V., Diamond, P. H., Papadopoulos, K., Liu, C-S., Su, J-J.
Publikováno v:
Physics of Plasmas, Volume 23, Issue 4, 2016
An analytic solution describing an ion-acoustic collisionless shock, self-consistently with the evolution of shock-reflected ions, is obtained. The solution extends the classic soliton solution beyond a critical Mach number, where the soliton ceases
Externí odkaz:
http://arxiv.org/abs/1512.02286
Publikováno v:
The Astrophysical Journal, Volume 768, Issue 1, article id. 73, (2013)
Supernova remnants (SNRs), as the major contributors to the galactic cosmic rays (CR), are believed to maintain an average CR spectrum by diffusive shock acceleration (DSA) regardless of the way they release CRs into the interstellar medium (ISM). Ho
Externí odkaz:
http://arxiv.org/abs/1207.4728
Publikováno v:
Physics of Plasmas, Volume 19, Issue 8, article id. 082901 (2012)
The proof of cosmic ray (CR) origin in supernova remnants (SNR) must hinge on full consistency of the CR acceleration theory with the observations; direct proof is impossible because of the orbit stochasticity of CR particles. Recent observations of
Externí odkaz:
http://arxiv.org/abs/1206.1384
Publikováno v:
PRL 108, 081104 (2012)
The much-anticipated proof of cosmic ray (CR) acceleration in supernova remnants (SNR) must hinge on full consistency of acceleration theory with the observations; direct proof is impossible because of the orbit scrambling of CR particles. The PAMELA
Externí odkaz:
http://arxiv.org/abs/1110.5335
Publikováno v:
The Astrophysical Journal Letters, Volume 748, Issue 2, article id. L32 (2012)
In shock precursors populated by accelerated cosmic rays (CR), the CR return current instability is believed to significantly enhance the pre-shock perturbations of magnetic field. We have obtained fully-nonlinear exact ideal MHD solutions supported
Externí odkaz:
http://arxiv.org/abs/1110.0257
Publikováno v:
Plasma Phys. Control. Fusion 52 (2010) 124006
Strong astrophysical shocks, diffusively accelerating cosmic rays (CR) ought to develop CR precursors. The length of such precursor $L_{p}$ is believed to be set by the ratio of the CR mean free path $\lambda$ to the shock speed, i.e., $L_{p}\sim c\l
Externí odkaz:
http://arxiv.org/abs/1007.3042
Publikováno v:
The Astrophysical Journal, 721:750-761, 2010
Both the acceleration of cosmic rays (CR) in supernova remnant shocks and their subsequent propagation through the random magnetic field of the Galaxy deem to result in an almost isotropic CR spectrum. Yet the MILAGRO TeV observatory discovered a sha
Externí odkaz:
http://arxiv.org/abs/1005.1312
Publikováno v:
Nature Communications 2 #194, 2011
Recent observations of the supernova remnant W44 by the \emph{Fermi} spacecraft observatory strongly support the idea that the bulk of galactic cosmic rays is accelerated in such remnants by a Fermi mechanism, also known as diffusive shock accelerati
Externí odkaz:
http://arxiv.org/abs/1004.4714