Event calendar file
3-11 July 2007
Merida, Mexico
Mexico/General timezone
- icrc2007@icrc2007.unam.mx
Support
OG 1.4
Place
Location: Merida, Mexico
Room: Uxmal + Tulum (Holiday Inn)
Date:
5 Jul 12:05 - 13:30
Timetable | Contribution List
Displaying 7
contributions
out of
7
We consider the effect of pre-existing turbulent fluctuations
in the fluid upstream of a propagating hydromagnetic
shock wave, in the limit of high enough Alf\'en mach
number that the magnetic field stresses can be neglected.
We find the expected effects on transverse diffusion, and
show that particles can be readily accelerated up to the
knee in the spectrum at a perpendicular shock.
... More
Presented by Prof. Jack (Randy) JOKIPII
on
5/7/2007
at
18:17
The magnetic trapping acceleration is a new type of particle trapping and
acceleration in which, in principle, test particles are accelerated indefinitely. A
model of magnetized plasma clouds is used to simulate a shock-type wave.
The attainable energies of test particles trapped by the moving magnetic
neutral sheets are investigated by analytical and numerical methods. To
account for
... More
Presented by Prof. Satoshi TAKEUCHI
on
5/7/2007
at
17:53
We present preliminary results of Particle-In-Cell simulations of magnetic turbulence
production by isotropic cosmic ray nucleons streaming upstream of supernova remnant
shocks. The studies aim at testing the MHD predictions by Bell (2004, 2005) of a
strong amplification of short-wavelength nonresonant wave modes and at studying the
the subsequent evolution of the magnetic turbulence and its b
... More
Presented by Dr. Jacek NIEMIEC
on
5/7/2007
at
18:05
We suggest a physical mechanism whereby the acceleration time of
cosmic rays by shock waves can be significantly reduced. This creates
the possibility of particle acceleration beyond the knee energy at
10^15 eV. The acceleration results from a nonlinear modification of the
flow ahead of the shock supported by particles already accelerated to
the knee momentum. The particles gain energy by bou
... More
Presented by Dr. Mikhail MALKOV
We present both numerical and semi-analytical results on test-particle
acceleration in multiple parallel shocks. We apply a kinetic Monte Carlo
code and an eigenfunction expansion method to calculate the
distribution functions for electron populations accelerated in
subsequent parallel shocks with thickness varying from infinitely thin
steps to broader modified structures, for shock speeds r
... More
Presented by Dr. Joni TAMMI
on
5/7/2007
at
17:17
The question of the origin of ultra-high-energy cosmic rays at relativistic shock
waves is discussed in the light of results of recent Monte Carlo studies of the
first-order Fermi particle acceleration (Niemiec & Ostrowski 2006; Niemiec, Ostrowski
& Pohl 2006). The models of the turbulent magnetic field near the shock considered in
these simulations include realistic features of the perturbed
... More
Presented by Dr. Jacek NIEMIEC
on
5/7/2007
at
17:05
We present some recent developments in the theory of particle acceleration at shock
fronts in the presence of dynamical reaction of the accelerated particles and
self-generation of magnetic field due to streaming instability. The spectra of
accelerated particles, the velocity, magnetic field and temperature profiles can be
calculated in this approach anywhere in the precursor and in the downst
... More
Presented by Dr. Pasquale BLASI
on
5/7/2007
at
17:41
