Moving Dislocations in a Shock Front

1981 ◽  
pp. 469-486 ◽  
Author(s):  
Johannes Weertman
Keyword(s):  
Shock Front

Investigation of shock-wave deformation history from recovered structure

1986 ◽  
Vol 44 ◽  
pp. 434-435
Author(s):  
M.A. Mogilevsky ◽  
L.S. Bushnev
Keyword(s):  
Shock Wave ◽  
Plastic Deformation ◽  
Dislocation Density ◽  
Shock Waves ◽  
Shock Front ◽  
Single Crystals ◽  
Residual Deformation ◽  
Deformation Structure ◽  
Deformation History ◽  
Deformation Velocity

Single crystals of Al were loaded by 15 to 40 GPa shock waves at 77 K with a pulse duration of 1.0 to 0.5 μs and a residual deformation of ∼1%. The analysis of deformation structure peculiarities allows the deformation history to be re-established.After a 20 to 40 GPa loading the dislocation density in the recovered samples was about 1010 cm-2. By measuring the thickness of the 40 GPa shock front in Al, a plastic deformation velocity of 1.07 x 108 s-1 is obtained, from where the moving dislocation density at the front is 7 x 1010 cm-2. A very small part of dislocations moves during the whole time of compression, i.e. a total dislocation density at the front must be in excess of this value by one or two orders. Consequently, due to extremely high stresses, at the front there exists a very unstable structure which is rearranged later with a noticeable decrease in dislocation density.

scholarly journals Unusual enhancement of ~ 30 MeV proton flux in an ICME sheath region

2021 ◽  
Vol 73 (1) ◽  
Author(s):  
Mitsuo Oka ◽  
Takahiro Obara ◽  
Nariaki V. Nitta ◽  
Seiji Yashiro ◽  
Daikou Shiota ◽  
...  
Keyword(s):  
Shock Front ◽  
Energetic Particle ◽  
Leading Edge ◽  
Solar Energetic Particle ◽  
Interplanetary Shock ◽  
Proton Event ◽  
Sheath Region ◽  
Time Profiles ◽  
Energetic Particle Flux ◽  
Mev Protons

AbstractIn gradual Solar Energetic Particle (SEP) events, shock waves driven by coronal mass ejections (CMEs) play a major role in accelerating particles, and the energetic particle flux enhances substantially when the shock front passes by the observer. Such enhancements are historically referred to as Energetic Storm Particle (ESP) events, but it remains unclear why ESP time profiles vary significantly from event to event. In some cases, energetic protons are not even clearly associated with shocks. Here, we report an unusual, short-duration proton event detected on 5 June 2011 in the compressed sheath region bounded by an interplanetary shock and the leading edge of the interplanetary CME (or ICME) that was driving the shock. While < 10 MeV protons were detected already at the shock front, the higher-energy (> 30 MeV) protons were detected about four hours after the shock arrival, apparently correlated with a turbulent magnetic cavity embedded in the ICME sheath region.

Reflectivity of a 5.8 kbar shock front in water

1981 ◽  
Vol 74 (12) ◽  
pp. 6864-6866 ◽  
Author(s):  
Paul Harris ◽  
Henri Nöel Presles
Keyword(s):  
Shock Front

Correction [to “Solar wind and location of shock front and magnetopause at the 1969 Solar Maximum”]

1971 ◽  
Vol 76 (13) ◽  
pp. 3178-3178
Author(s):  
A. Egidi ◽  
V. Formisiano ◽  
F. Palmiotto ◽  
P. Saraceno ◽  
G. Moreno
Keyword(s):  
Solar Wind ◽  
Shock Front ◽  
Solar Maximum

Peculiarities of evolution of single-component gas molecule distribution in relative velocities in the shock front

1995 ◽  
Vol 30 (4) ◽  
pp. 540-544
Author(s):  
S. V. Kulikov ◽  
O. N. Ternovaya ◽  
S. L. Chereshnev
Keyword(s):  
Shock Front ◽  
Single Component ◽  
Gas Molecule

scholarly journals Generation of magnetic fluctuations near a shock front in a partially ionized medium

2005 ◽  
Vol 31 (11) ◽  
pp. 748-754 ◽  
Author(s):  
A. M. Bykov ◽  
I. N. Toptygin
Keyword(s):  
Shock Front ◽  
Magnetic Fluctuations ◽  
Partially Ionized

scholarly journals Initial pressure of the shock front launched by a streamer discharge in water

AIP Advances ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 075214
Author(s):  
Xiaodong Xue ◽  
Xiaoqiong Wen ◽  
Yuantian Yang ◽  
Liru Wang ◽  
Xue Wang
Keyword(s):  
Shock Front ◽  
Initial Pressure ◽  
Streamer Discharge

scholarly journals The Radiative Energy Loss from the Shock Front

1973 ◽  
Vol 49 (6) ◽  
pp. 1911-1931 ◽  
Author(s):  
Shinji Narita
Keyword(s):  
Energy Loss ◽  
Shock Front ◽  
Radiative Energy ◽  
Radiative Energy Loss

Unusual enhancement of ~30 MeV proton flux in an ICME sheath region

2021 ◽  
Author(s):  
Mitsuo Oka ◽  
Takahiro Obara ◽  
Nariaki Nitta ◽  
Seiji Yashiro ◽  
Daikou Shiota ◽  
...  
Keyword(s):  
Shock Front ◽  
Energetic Particle ◽  
Leading Edge ◽  
Solar Energetic Particle ◽  
Interplanetary Shock ◽  
Proton Event ◽  
Sheath Region ◽  
Time Profiles ◽  
Energetic Particle Flux ◽  
Mev Protons

&lt;p&gt;In gradual Solar Energetic Particle (SEP) events, shock waves driven by coronal mass ejections (CMEs) play a major role in accelerating particles, and the energetic particle flux enhances substantially when the shock front passes by the observer. Such enhancements are historically referred to as Energetic Storm Particle (ESP) events, but it remains unclear why ESP time profiles vary significantly from event to event. In some cases, energetic protons are not even clearly associated with shocks. Here we report an unusual, short-duration proton event detected on 5 June 2011 in the compressed sheath region bounded by an interplanetary shock and the leading-edge of the interplanetary CME (or ICME) that was driving the shock. While &lt;10 MeV protons were detected already at the shock front, the higher-energy (&gt;30 MeV) protons were detected about four hours after the shock arrival, apparently correlated with a turbulent magnetic cavity embedded in the ICME sheath region.&lt;/p&gt;

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