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Conferences
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ICN-UNAM
1482bc95ee34f0461176da21871284c8
3
icrc2007@icrc2007.unam.mx
30th International Cosmic Ray Conference
The 30th International Cosmic Ray Conference will be held from July 3, 2007 to July 11, 2007 in Merida, Yucatan, Mexico.
True
Merida, Mexico
2007-07-03T08:00:00
2007-07-11T19:00:00
2005-09-26T05:04:53
2024-04-12T17:46:55
Mexico/General
Dr.
IGeof-UNAM
40af9343b8bb9d18708b4f0252d5f53c
763
false
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1
Poster
Micro and macro-instabilities driven by cosmic rays
Dr.
University of California San Diego
4f0bab35f5d37cfdcc080e73cd660ea1
Dr.
University of California San Diego
4f0bab35f5d37cfdcc080e73cd660ea1
University of California San Diego
d41d8cd98f00b204e9800998ecf8427e
Merida, Mexico
Regency (Hyatt)
Cosmic rays (CR) are thought to be accelerated in
strong shocks such as supernova remnant shocks. Their
acceleration, however, significantly modifies the shock
environment and thus influences the acceleration
process itself. The paradigm of enhanced CR
acceleration by scattering them off the self-generated
Alfven waves seems to explain the supernova remnant
origin of galactic CRs up to the energies ~10^15 eV. At the
same time recent improved observations and analyses
suggest a possibility of acceleration of CRs to even
higher energies (10^17-10^18 eV) in the same sources. This
requires a thorough reconsideration of the backreaction
of accelerated particles on the shock structure and on
the MHD turbulence that helps to confine and accelerate
particles. We consider the Alfven wave instability
driven by the CR cloud ahead of the shock in a regime
of strong rms magnetic field (exceeding an ambient
field) which is more appropriate for an enhanced
acceleration. The second part of this study deals with
the structural stability and bifurcation of the shock
which also strongly influences the acceleration rate by
altering the flow velocity gradient and the shock
compression.
1
More information about the venue
http://www.icrc2007.unam.mx/
link
http://www.icrc2007.unam.mx/
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