Browsing by Author "Zhang, Ming"
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Acceleration of lowenergy ions at parallel shocks with a focused transport model
Zuo, Pingbing; Zhang, Ming; Rassoul, Hamid K. (20130410)We present a test particle simulation on the injection and acceleration of lowenergy suprathermal particles by parallel shocks with a focused transport model. The focused transport equation contains all necessary physics ... 
Acceleration of suprathermal particles by compressional plasma wave trains in the solar wind
Zhang, Ming (20101204)This paper presents a calculation of particle acceleration by an idealized compressional plasma wave train. In this model, suprathermal particles, such as pickup ions, are continuously injected into a wave train consisting ... 
The comptongetting effect of energetic particles with an anisotropic pitchangle distribution: An application to Voyager 1 results at ∼85 AU
Zhang, Ming (20050510)This paper provides a theoretical simulation of anisotropy measurements by the LowEnergy Charged Particle (LECP) experiment on Voyager. The model starts with an anisotropic pitchangle distribution function in the solar ... 
Correlation between energetic ion enhancements and heliospheric current sheet crossings in the outer heliosphere
Richardson, John D.; Stone, Edward C.; Cummings, Ace C.; Kasper, Justin C.; Zhang, Ming; Burlaga, Leonard F.; Ness, Nudel F.; Liu, Ying (20061114)Voyagers 1 and 2 observed highlyvariable beams of energetic ions in the foreshock region upstream of the termination shock (TS). At Voyager 2 (V2), the ion intensities are generally not related to the plasma properties. ... 
Cosmic ray transport and production in the galaxy: A stochastic propagation simulation approach
Farahat, Ashraf M.; Zhang, Ming; Rassoul, Hamid K.; Connell, James J. (20080710)Galactic cosmicray composition reflects the effects of nuclear interactions during propagation through the interstellar medium. In order to use measurements to determine the source of cosmic rays, one needs a model to ... 
Cosmicray modulation by the global merged interaction region in the heliosheath
Luo, Xi; Zhang, Ming; Rassoul, Hamid K.; Pogorelov, Nikolai V. (20110224)It was found by Voyager 1 and Voyager 2 that the Global Merged Interaction Region (GMIR) still has effects on cosmicray transport in the heliosheath. The GMIR produced by the intense solar activities of 2005 September ... 
Delay in solar energetic particle onsets at high heliographic latitudes
Dalla, Silvia C.; Balogh, André; Krucker, Säm Ä M.; Posner, Arik; MüllerMellin, Reinhold; Anglin, J. D.; Hofer, Mirjam Y.; Marsden, Richard G.; Sanderson, T. R.; Zhang, Ming (20030630)Ulysses observations have shown that solar energetic particles (SEPs) can easily reach high heliographic latitudes. To obtain information on the release and propagation of SEPs prior to their arrival at Ulysses, we ... 
Diffusive compression acceleration of energetic particles with an application to shock acceleration near injection energies
Zhang, Ming (20070820)The behavior of energetic charged particles accelerated by a continuous plasma compression profile is explored in the framework of diffusion. At high enough energies, the accelerated particles have a powerlaw spectrum ... 
Double power laws in the eventintegrated solar energetic particle spectrum
Zhao, Lulu; Zhang, Ming; Rassoul, Hamid K. (20160410)A double power law or a power law with exponential rollover at a few to tens of MeV nucleon−1 of the eventintegrated differential spectra has been reported in many solar energetic particle (SEP) events. The rollover energies ... 
An effect of perpendicular diffusion on the anisotropy of solar energetic particles from unconnected sources
Qin, Gang; He, H. Q.; Zhang, Ming (20110810)Recently, Tan and coworkers studied the 2001 September 24 solar energetic particle (SEP) event observed by the Wind spacecraft at 1AU and found that there is a counterstreaming particle beam with a deep depression of flux ... 
Effects of Coronal Magnetic Field Structures on the Transport of Solar Energetic Particles
Zhao, Lulu L.; Zhang, Ming (20180604)This Letter presents a model calculation of solar energetic particle (SEP) transport to test the sensitivity of the distribution of escaped SEPs in interplanetary space and dependence upon the details of the magnetic field ... 
The Effects of Interplanetary Transport in the Eventintergrated Solar Energetic Particle Spectra
Zhao, Lulu; Zhang, Ming; Rassoul, Hamid K. (20170207)Previous investigations on the energy spectra of solar energetic particle (SEP) events revealed that the energy spectra observed at 1 au often show double power laws with break energies from one to tens of MeV/nuc. In order ... 
Effects of perpendicular diffusion on energetic particles accelerated by the interplanetary coronal mass ejection shock
Wang, Y.; Qin, Gang; Zhang, Ming (20120610)In this work, based on a numerical solution of the focused transport equation, we obtained the intensity and anisotropy time profiles of solar energetic particles (SEPs) accelerated by an interplanetary shock in the ... 
Energy spectrum of energetic particles accelerated by shock waves: From focused transport to diffusive acceleration
Zuo, Pingbing; Zhang, Ming; Gamayunov, Konstantin V.; Rassoul, Hamid K.; Luo, Xi (20110823)The focused transport equation (FTE) includes all the necessary physics for modeling the shock acceleration of energetic particles with a unified description of firstorder Fermi acceleration, shock drift acceleration, and ... 
Galactic cosmicray modulation in a realistic global magnetohydrodynamic heliosphere
Luo, Xi; Zhang, Ming; Rassoul, Hamid K.; Pogorelov, Nikolai V.; Heerikhuisen, Jacob (20130210)To understand the behavior of cosmicray modulation seen by the two Voyager spacecraft in the region near the termination shock (TS) and in the heliosheath at a distance of >100 AU, a realistic magnetohydrodynamic global ... 
Galactic cosmicray modulation using a solar minimum MHD heliosphere: A stochastic particle approach
Ball, Bryan M.; Zhang, Ming; Rassoul, Hamid K.; Linde, Timur J. (20051201)An example of Galactic cosmicray modulation in a fully threedimensional heliosphere is presented here. We use a stochastic particle method to solve for modulation without requiring symmetric boundaries or fields. We ... 
The Heliosphere as Seen in TeV Cosmic Rays
Zhang, Ming; Pogorelov, Nikolai V. (2016)Measurements from several cosmicray air shower experiments reveal that the anisotropy of TeV cosmicray flux does not agree with a dipole pattern commonly expected from the ComptonGetting effect or from the diffusion of ... 
Heliospheric influence on the anisotropy of TeV cosmic rays
Zhang, Ming; Zuo, Pingbing; Pogorelov, Nikolai V. (20140626)This paper provides a theory of using Liouville's theorem to map the anisotropy of TeV cosmic rays seen at Earth using the particle distribution function in the local interstellar medium (LISM). The ultimate source of ... 
THE HELIOTAIL
Pogorelov, Nikolai V.; Borovikov, Sergey N.; Heerikhuisen, Jacob; Zhang, Ming (20151006)The heliotail is formed when the solar wind (SW) interacts with the local interstellar medium (LISM) and is shaped by the interstellar magnetic field (ISMF). While there are no spacecraft available to perform in situ ... 
Interplanetary transport mechanisms of solar energetic particles
Qin, Gang; Zhang, Ming; Dwyer, Joseph R.; Rassoul, Hamid K. (20040710)Numerical simulations of charged particle trajectories in a Parker field with model turbulence are used to study the transport mechanisms of solar energetic particles (SEPs): magnetic focusing, pitchangle diffusive transport ...