Pickup ion energization by shock surfing

Energization at a quasi-perpendicular shock is described for ions which approach the shock with a speed much less than that of the incoming plasma. These ions may be trapped between the shock electrostatic potential and the upstream Lorentz force and accelerated by “surfing” along the shock surface, before eventually escaping the shock into the upstream or downstream plasma. The process is described in detail, extending previous work on the mechanism, and energy gains are calculated. It is pointed out that pickup ions in the solar wind are ideally configured, so that a reasonable fraction of the ions can be accelerated by this mechanism at cometary bow shocks, the solar wind termination shock, and interplanetary traveling shocks. The mechanism may provide the required “injection” or preacceleration at quasi-perpendicular shocks for subsequent diffusive shock acceleration.

[1]  N. Omidi,et al.  Steepening of kinetic magnetosonic waves into shocklets: Simulations and consequences for planetary shocks and comets , 1990 .

[2]  K. Glassmeier,et al.  VELOCITY SPACE DIFFUSION OF PICKUP IONS FROM THE WATER GROUP AT COMET HALLEY , 1989 .

[3]  F. Neubauer,et al.  Quasi-linear pitch angle and energy diffusion of pickup ions near Comet Halley , 1991 .

[4]  Derek A. Tidman,et al.  Shock waves in collisionless plasmas , 1971 .

[5]  Y. Midzuno,et al.  Non-Stochastic Heating of Magnetized Plasma by Electrostatic Wave , 1977 .

[6]  R. Z. Sagdeev,et al.  Cooperative Phenomena and Shock Waves in Collisionless Plasmas , 1966 .

[7]  J. Sakai,et al.  PROMPT SIMULTANEOUS ACCELERATION OF PROTONS AND ELECTRONS TO RELATIVISTIC ENERGIES BY SHOCK WAVES IN SOLAR FLARES , 1987 .

[8]  P. Isenberg.  Energy Diffusion of Pickup Ions Upstream of Comets (JGR 92 (A8) 1987) , 1987 .

[9]  J. Giacalone,et al.  Perpendicular transport in 1‐ and 2‐dimensional shock simulations , 1993 .

[10]  J. Sakai,et al.  Ion acceleration in quasi‐perpendicular collisionless magnetosonic shock waves with subcritical Mach number , 1985 .

[11]  F. Kahn,et al.  Reflection of Charged Particles by Plasma Shocks , 1965 .

[12]  R. Sagdeev,et al.  Alfv'en shock wave trains with a dispersion , 1988 .

[13]  Y. Ohsawa.  Conditions for Ion Reflection in a Large-Amplitude Magnetosonic Wave , 1990 .

[14]  A. Coates,et al.  Quasi-linear velocity space diffusion of heavy cometary pickup ions on bispherical diffusion characteristics , 1992 .

[15]  B. Sonnerup.  Acceleration of particles reflected at a shock front , 1969 .

[16]  W. I. Axford.  THE ACCELERATION OF COSMIC RAYS BY SHOCK WAVES , 1981 .

[17]  R. Decker.  The modulation of low‐energy proton distributions by propagating interplanetary shock waves: A numerical simulation , 1981 .

[18]  R. Redl,et al.  First observations of energetic particles near comet Halley , 1986 .

[19]  R. Sagdeev,et al.  Alfvén waves in a space plasma and its role in the solar wind interaction with comets , 1988, Astrophysics and Space Science.

[20]  R. Sagdeev,et al.  Mass loading and MHD turbulence in the solar wind/comet interaction region , 1986 .

[21]  J. Jokipii.  Particle drift, diffusion, and acceleration at shocks , 1982 .

[22]  D. Ellison,et al.  Noncoplanar magnetic fields, shock potentials, and ion deflection , 1987 .

[23]  Y. Ohsawa.  Strong ion acceleration by a collisionless magnetosonic shock wave propagating perpendicularly to a magnetic field , 1985 .

[24]  J. Scudder,et al.  The resolved layer of a collisionless, high β, supercritical, quasi-perpendicular shock wave, 2. Dissipative fluid electrodynamics , 1986 .

[25]  W. Ip,et al.  Hydromagnetic wave excitation by ionized interstellar hydrogen and helium in the solar wind , 1987 .

[26]  M. Wallis,et al.  Strongly-cooled ionizing plasma flows with application to venus , 1975 .

[27]  J. Geiss,et al.  Acceleration of interstellar pickup ions in the disturbed solar wind observed on Ulysses , 1994 .

[28]  C. Kennel,et al.  Escape of heated ions upstream of quasi-parallel shocks , 1982 .

[29]  Jeremiah P. Ostriker,et al.  Particle Acceleration by Astrophysical Shocks , 1978 .

[30]  B. Tsurutani,et al.  Acceleration of energetic protons by interplanetary shocks , 1979 .

[31]  T. Sanderson,et al.  Observations of energetic water-group ions at comet giacobini-zinner: Implications for ion acceleration processes , 1987 .

[32]  D. Eichler,et al.  Cosmic ray drift, shock wave acceleration and the anomalous component of cosmic rays , 1981 .

[33]  Iver H. Cairns,et al.  Interstellar pickup ions and quasi‐perpendicular shocks: Implications for the termination shock and interplanetary shocks , 1996 .

[34]  S. Takeuchi,et al.  DC Acceleration of Charged Particles by an Electrostatic Wave Propagating Obliquely to a Magnetic Field B^^^ _0 , 1984 .

[35]  D. D. Barbosa.  Stochastic acceleration of cometary pickup ions - The classic leaky box model , 1989 .

[36]  Tamas I. Gombosi,et al.  The telegraph equation in charged particle transport , 1993 .

[37]  A. Bell.  The acceleration of cosmic rays in shock fronts – I , 1978 .

[38]  B. Klecker,et al.  Comet Giacobini-Zinner: In Situ Observations of Energetic Heavy Ions , 1986, Science.

[39]  J. R. Jokipii.  Particle acceleration at a termination shock 1. Application to the solar wind and the anomalous component , 1986 .

[40]  A. Coates.  Correction to “Velocity space diffusion of pickup ions from the water group at comet Halley” , 1990 .

[41]  E. Möbius,et al.  Direct observation of He+ pick-up ions of interstellar origin in the solar wind , 1985, Nature.

[42]  E. Möbius,et al.  Interaction of interstellar pick-up ions with the solar wind , 1988, Astrophysics and Space Science.

[43]  F. C. Jones,et al.  The Influence of Particle Scattering on Acceleration Rates and Injection Efficiencies in Oblique Shocks , 1995 .

[44]  Charles C. Goodrich,et al.  The structure of perpendicular bow shocks , 1982 .

[45]  G. Siscoe,et al.  On the flux and the energy spectrum of interstellar ions in the solar system , 1976 .

[46]  Reuven Ramaty,et al.  An interpretation of the observed oxygen and nitrogen enhancements in low energy cosmic rays. , 1973 .

[47]  J. Gosling,et al.  Noncoplanar magnetic fields at collisionless shocks: A test of a new approach , 1988 .

[48]  B. Klecker,et al.  COMETARY PICK-UP IONS OBSERVED NEAR GIACOBINI-ZINNER. , 1986 .

[49]  T. Gombosi,et al.  Comparison of Observed and Calculated Implanted Ion Distributions Outside Comet Halley's Bow Shock , 1991 .

[50]  W. I. Axford,et al.  The acceleration of particles in the vicinity of comets , 1986 .

[51]  E. Sarris,et al.  Effects of interplanetary shock waves on energetic charged particles. Progress report , 1974 .

[52]  T. Bogdan,et al.  Coupled quasi‐linear wave damping and stochastic acceleration of pickup ions in the solar wind , 1991 .

[53]  B. Tsurutani,et al.  Acceleration of cometary H2O group pickup ions by obliquely propagating nonlinear magnetosonic waves , 1993 .

[54]  J. Sakai,et al.  Prompt proton and electron acceleration to relativistic energies in solar flares , 1988 .

[55]  C. Russell,et al.  On the noncoplanarity of the magnetic field within a fast collisionless shock , 1987 .

[56]  Y. Ohsawa.  Resonant Ion Acceleration by Oblique Magnetosonic Shock Wave in a Collisionless Plasma , 1985 .

[57]  Y. Ohsawa.  ACCELERATION OF ENERGETIC IONS BY A NEARLY PERPENDICULAR INTERPLANETARY SHOCK , 1986 .

[58]  R. Sagdeev,et al.  Stochastic Fermi acceleration of ions in the pre-shock region of comet P/Halley , 1988 .

[59]  T. Armstrong,et al.  The acceleration of charged particles in interplanetary shock waves , 1982 .

[60]  B. Tsurutani,et al.  Strong Hydromagnetic Turbulence Associated with comet Giacobini-Zinner (GRL 13(3) 1986) , 1986 .

[61]  J. Dawson,et al.  Plasma heating and acceleration by strong magnetosonic waves propagating obliquely to a magnetostatic field , 1984 .

[62]  J. Dawson,et al.  Unlimited Electron Acceleration in Laser-Driven Plasma Waves , 1983 .

[63]  R. Sagdeev,et al.  Influence of transverse magnetic field on Landau damping , 1973 .

[64]  Y. Ohsawa.  Unified Theory for Solar Energetic Particles: Basic Composition, 3He-Rich Events, and Prompt Ion Acceleration , 1993 .

[65]  K. Quest,et al.  Simulations of high Mach number perpendicular shocks with resistive electrons , 1986 .

[66]  B. Lembège,et al.  Ion heating and acceleration by strong magnetosonic waves , 1983 .

[67]  J. Jokipii.  Rate of energy gain and maximum energy in diffusive shock acceleration , 1987 .

[68]  G. Krymskiĭ.  A regular mechanism for the acceleration of charged particles on the front of a shock wave , 1977 .

[69]  T. Cravens,et al.  Combined energy and pitch angle diffusion of pickup ions at comet Halley , 1991 .

[70]  J. Sakai,et al.  Non-stochastic prompt proton acceleration by fast magnetosonic shocks in the solar plasma , 1986 .

[71]  T. Gombosi,et al.  Combined first‐ and second‐order Fermi acceleration in cometary environments , 1989 .