Inner-Source Pickup Ions as Sensitive Probes to the Inner-Heliospheric Micro-State

Details Inner-Source Pickup Ions as Sensitive Probes to the Inner-Heliospheric Micro-State Inner-Source Pickup Ions as Sensitive Probes to the Inner-Heliospheric Micro-State

Mar 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1216..506w&link_type=abstract

TWELFTH INTERNATIONAL SOLAR WIND CONFERENCE. AIP Conference Proceedings, Volume 1216, pp. 506-509 (2010).

Statistics

Applications

Solar Wind, Magnetic Fields, Interplanetary Matter, Turbulence, Monte Carlo Methods, Particle Emission, Solar Wind, Electric And Magnetic Fields, Solar Magnetism, Interplanetary Dust And Gas, Convection, Turbulence, And Diffusion, Applications Of Monte Carlo Methods

Scientific paper

Inner-source pickup ions have been investigated by several workers who all assumed an initial velocity distribution function which is dominated by high velocities in the solar wind velocity frame. This non-thermal velocity distribution is supposed to be due to the Lorentz force which acts on the freshly ionized particles. However, the location where inner-source pickup ions are ionized lies close to the Sun (probably between 5 and 25 rsolar). The magnetic field and solar wind velocity are near radial there and the Lorentz force acting on freshly created ions is small. Particles sputtered or ejected with small relative velocities (EOf course, the principal acceleration agent for inner-source pickup ions has to be wave-particle interactions in the inner heliosphere. As freshly created pickup ions encounter a wave, their pitch angle is scattered and they will, in most cases, experience a net gain in momentum which carries them outwards, out of the solar system. As we will show, inner-source pickup ions are thus highly sensitive probes of the turbulent microstate of the inner heliosphere.

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