scholarly journals Verification of the diffusive shock acceleration in Mrk 501

2018 ◽  
Vol 478 (3) ◽  
pp. 3855-3861 ◽  
Author(s):  
Y G Zheng ◽  
G B Long ◽  
C Y Yang ◽  
J M Bai
Keyword(s):  
Shock Acceleration ◽  
Diffusive Shock Acceleration

scholarly journals Effects of the solar wind termination shock and heliosheath on theheliospheric modulation of galactic and anomalous Helium

2004 ◽  
Vol 22 (8) ◽  
pp. 3063-3072 ◽  
Author(s):  
U. W. Langner ◽  
M. S. Potgieter
Keyword(s):  
Solar Wind ◽  
Cosmic Ray ◽  
Magnetic Polarity ◽  
Termination Shock ◽  
Shock Acceleration ◽  
Diffusive Shock Acceleration ◽  
Cosmic Ray Modulation ◽  
Low Energies ◽  
Solar Wind Termination Shock ◽  
Charge Sign

Abstract. The interest in the role of the solar wind termination shock and heliosheath in cosmic ray modulation studies has increased significantly as the Voyager 1 and 2 spacecraft approach the estimated position of the solar wind termination shock. The effect of the solar wind termination shock on charge-sign dependent modulation, as is experienced by galactic cosmic ray Helium (He++) and anomalous Helium (He+), is the main topic of this work, and is complementary to the previous work on protons, anti-protons, electrons, and positrons. The modulation of galactic and anomalous Helium is studied with a numerical model including a more fundamental and comprehensive set of diffusion coefficients, a solar wind termination shock with diffusive shock acceleration, a heliosheath and particle drifts. The model allows a comparison of modulation with and without a solar wind termination shock and is applicable to a number of cosmic ray species during both magnetic polarity cycles of the Sun. The modulation of Helium, including an anomalous component, is also done to establish charge-sign dependence at low energies. We found that the heliosheath is important for cosmic ray modulation and that its effect on modulation is very similar for protons and Helium. The local Helium interstellar spectrum may not be known at energies

scholarly journals DIFFUSIVE SHOCK ACCELERATION SIMULATIONS OF RADIO RELICS

2012 ◽  
Vol 756 (1) ◽  
pp. 97 ◽  
Author(s):  
Hyesung Kang ◽  
Dongsu Ryu ◽  
T. W. Jones
Keyword(s):  
Shock Acceleration ◽  
Diffusive Shock Acceleration

Diffusive shock acceleration and the March 1991 solar events

1992 ◽  
Vol 19 (12) ◽  
pp. 1259-1262 ◽  
Author(s):  
N. Naidu ◽  
J. J. Quenby ◽  
E. Keppler ◽  
A. Korth ◽  
M. Witte ◽  
...  
Keyword(s):  
Shock Acceleration ◽  
Diffusive Shock Acceleration ◽  
Solar Events

Acceleration of Solar Energetic Particles in CME-Driven Coronal Shocks up to 30 Rs

2021 ◽  
Author(s):  
Kamen Kozarev ◽  
Mohamed Nedal ◽  
Rositsa Miteva ◽  
Pietro Zucca ◽  
Momchil Dechev
Keyword(s):  
Emission Measure ◽  
Realistic Model ◽  
Energetic Particles ◽  
Solar Energetic Particles ◽  
Shock Acceleration ◽  
Quiet Time ◽  
Diffusive Shock Acceleration ◽  
Important Region ◽  
Wave Surfaces ◽  
Mass Ejection

<p>The lower and middle solar corona up to about 30 solar radii is thought to be an important region for early acceleration and transport of solar energetic particles (SEPs) by coronal mass ejection-driven shock waves. There, these waves propagate into a highly variable dynamic medium with steep gradients and rapidly expanding coronal magnetic fields, which modulates the particle acceleration near the shock/wave surfaces, and the way SEPs spread into the heliosphere. We present a study modeling the acceleration of SEPs in over 50 separate global coronal shock events between 1 and 30 solar radii. As part of the SPREAdFAST framework project, we analyzed the interaction of off-limb coronal bright fronts (CBF) observed with the SDO/AIA EUV telescope with realistic model coronal plasma based on results from synoptic magnetohydrodynamic (MHD) and differential emission measure (DEM) models. We used realistic quiet-time proton spectra observed near Earth to form seed suprathermal populations accelerated in our diffusive shock acceleration model (Kozarev & Schwadron, 2016). We summarize our findings and present implications for nowcasting SEP acceleration and heliospheric connectivity.</p>

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