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  • Composition Measurements  (1)
  • Magnetopause  (1)
  • Space plasma physics (charged particle motion and acceleration; numerical simulation studies)  (1)
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Material
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  • 1
    Electronic Resource
    Electronic Resource
    Injection and acceleration of H+ and He2+ at Earth’s bow shock (1999)
    Springer
    Annales geophysicae 17 (1999), S. 583-594 
    Details
    ISSN: 0992-7689
    Keywords: Interplanetary physics (planetary bow shocks) ; Space plasma physics (charged particle motion and acceleration; numerical simulation studies)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract We have performed a number of one-dimensional hybrid simulations (particle ions, massless electron fluid) of quasi-parallel collisionless shocks in order to investigate the injection and subsequent acceleration of part of the solar wind ions at the Earth’s bow shock. The shocks propagate into a medium containing magnetic fluctuations, which are initially superimposed on the background field, as well as generated or enhanced by the electromagnetic ion/ion beam instability between the solar wind and backstreaming ions. In order to study the mass (M) and charge (Q) dependence of the acceleration process He2+ is included self-consistently. The upstream differential intensity spectra of H+ and He2+ can be well represented by exponentials in energy. The e-folding energy Ec is a function of time: Ec increases with time. Furthermore the e-folding energy (normalized to the shock ramming energy Ep) increases with increasing Alfvén Mach number of the shock and with increasing fluctuation level of the initially superimposed turbulence. When backstreaming ions leave the shock after their first encounter they exhibit already a spectrum which extends to more than ten times the shock ramming energy and which is ordered in energy per charge. From the injection spectrum it is concluded that leakage of heated downstream particles does not contribute to ion injection. Acceleration models that permit thermal particles to scatter like the non-thermal population do not describe the correct physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00585-999-0583-6
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The Low-Latitude Boundary Layer at the Flanks of the Magnetopause (1997)
    Springer
    Space science reviews 80 (1997), S. 341-367 
    Details
    ISSN: 1572-9672
    Keywords: Magnetopause ; Boundary Layer ; Reconnection ; Kelvin-Helmholtz-Instability ; Diffusion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This is a brief overview on what we know and do not know about the low-latitude boundary layer (LLBL) at the flanks of the magnetotail. On the basis of recent observations, simulations and theories we conclude that reconnection is the dominant process in generating the LLBL and its structure probably even under northward IMF conditions. Part of the LLBL always seems to be on open field lines. Possibly the LLBL possesses a double structure with its outer part open and inner part closed. Anomalous diffusive processes cannot sustain the LLBL but provide sufficient diffusivity for reconnection. Strong diffusion is only expected in narrow localized regions and can make the transition to superdiffusion. Kelvin-Helmholtz instability (KHI) is favoured for northward IMF, producing vortices at the tail flanks. Its contribution to efficient mass transport still remains questionable. Coupling of the LLBL to the ionosphere can strongly affect the internal structure of the LLBL, causing turbulent eddies and detachments of plasma blobs as also field-aligned currents and electron heating. The structure and dynamics of the LLBL are affected by field-aligned electric potentials that decouple the LLBL from the ionosphere. Non-ideal coupling simulations suggest that the dusk flank is decoupled, favouring KHI, while the dawn flank is dominated by currents and turbulence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004986323461
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    CELIAS - Charge, Element and Isotope Analysis System for SOHO (1995)
    Springer
    Solar physics 162 (1995), S. 441-481 
    Details
    ISSN: 1573-093X
    Keywords: SOHO ; Solar Wind ; Solar Energetic Particles ; Composition Measurements ; Time-of-Flight Spectrometer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The CELIAS experiment on SOHO is designed to measure the mass, ionic charge and energy of the low and high speed solar wind, of suprathermal ions, and of low energy flare particles. Through analysis of the elemental and isotopic abundances, the ionic charge state, and the velocity distributions of ions originating in the solar atmosphere, the investigation focuses on the plasma processes on various temporal and spatial scales in the solar chromosphere, transition zone, and corona. CELIAS includes 3 mass- and charge-discriminating sensors based on the time-of-flight technique: CTOF for the elemental, charge and velocity distribution of the solar wind, MTOF for the elemental and isotopic composition of the solar wind, and STOF for the mass, charge and energy distribution of suprathermal ions. The instrument will provide detailed in situ diagnostics of the solar wind and of accelerated particles, which will complement the optical and spectroscopic investigations of the solar atmosphere on SOHO. CELIAS also contains a Solar Extreme Ultraviolet Monitor, SEM, which continously measures the EUV flux in a wide band of 17 – 70 nm, and a narrow band around the 30.4 nm He II line.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00733436
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    Paper (German National Licenses)
    Fulltext
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