Results 181 to 190 of about 40,059 (211)
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Advances in Space Research, 2004
The interaction of a comet with the solar wind starts with ion pickup. This key process is also important in other solar system contexts wherever neutral particles become ionized and injected into a flowing plasma such as at Mars, Venus, Io, Titan and interstellar neutrals in the solar wind.
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The interaction of a comet with the solar wind starts with ion pickup. This key process is also important in other solar system contexts wherever neutral particles become ionized and injected into a flowing plasma such as at Mars, Venus, Io, Titan and interstellar neutrals in the solar wind.
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Hydrogen pickup in ion nitrided steels
Materials Science and Technology, 1993AbstractUsing the energy recoil detection analysis technique, hydrogen close to the surface of ion nitrided AISI steel M2 was studied. A surface hydrogen peak was observed in all samples, with or without exposure to the glow discharge. Some bulk hydrogen was also measured in all cases; its distribution was dependent on the history of the sample.
J. Rickards +7 more
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Pickup ion energization by shock surfing
Journal of Geophysical Research: Space Physics, 1996Energization 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 ...
Martin A. Lee +2 more
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Acceleration of pickup ions at the termination shock
AIP Conference Proceedings, 2006With a model based on the numerical solution of the standard focused transport equation we investigated the acceleration of ∼ 1 keV interstellar pickup protons at a reverse shock with an obliquity of 45°. We found that the model reproduces the basic spectral features of more sophisticated hybrid codes. The model also explains in principle the Voyager 1
J. A. le Roux, G. M. Webb
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On the Origin of Inner Source Pickup Ions
AIP Conference Proceedings, 2010Inner source pickup ions are thought to originate from the interaction of solar wind ions with interplanetary dust grains in the inner heliosphere. Processes which produce inner source pickup ions, and which have been considered so far are implantation of solar wind on grains and subsequent desorption, charge exchange of solar wind ions during transit ...
Peter Bochsler +7 more
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Energy diffusion of pickup ions upstream of comets
Journal of Geophysical Research: Space Physics, 1987We present a steady state model of pickup ion energization upstream of a cometary bow wave in order to investigate the effects of quasi‐linear energy diffusion in the turbulence there. The model assumes that the ions are immediately isotropized at pickup, and it includes the effects of adiabatic acceleration in the slowing solar wind and of continual ...
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Charge-pickup processes in relativistic heavy-ion reactions
Physical Review C, 1995We have measured a complete isotope distribution of projectile-like nuclear-charge pickup products, formed by bombarding a {sup 17}Al target with 790{ital A} MeV {sup 129}Xe ions. The shape of the cross-section distribution indicates a dominant influence of evaporation processes during the formation of the final cesium fragments observed, thus masking ...
, Sümmerer +8 more
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Pickup Ions Upstream and Downstream of Shocks
AIP Conference Proceedings, 2005The evolution of differential energy spectra and distribution functions of H+, He+ and He++ across shock boundaries is examined to gain insight into the acceleration of solar wind and pickup ions by various types of shocks. Data from the SWICS and HISCALE instruments on Ulysses are combined in order to span the wide energy range from ∼0.6 keV/e to ...
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Pickup ions observed at comet Halley
AIP Conference Proceedings, 1992Instruments on the Giotto spacecraft obtained data on the velocity distributions of pickup ions in the vicinity of comet Halley. Combination of data from two different instruments allows a comparative study of the pitch‐angle scattering rates and velocity diffusion rates of protons and water‐group ions. The key features of the data are reviewed.
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Simulations of pickup-ion acceleration at quasi-perpendicular shocks
Space Science Reviews, 1995We present results from hybrid simulations (kinetic ion/fluid electron) of the interaction of interstellar pickup ions with collisionless shocks. Since cross-field transport is unphysically suppressed in the one-dimensional geometry used here, an ad hoc scattering algorithm is used to model this effect. This is a necessary step to accelerate the pickup
J. Giacalone, J. R. Jokipii
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