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- W188665776 abstract "Observations of energetic ion acceleration at interplanetary shocks sometimes indicate a spectral rollover at ∼ 0.1 to 1 MeV/nucleon. This rollover is not well explained by finite shock width or thickness effects. At the same time, a typical timescale of diffusive shock acceleration is several days, implying that the process of shock acceleration at an interplanetary shock near Earth usually gives only a mild increase in energy to an existing seed particle population. This is consistent with recent analyses of ACE observations that argue for a seed population at substantially higher energies than the solar wind. Therefore an explanation of typical spectra of interplanetary shock-accelerated ions requires a theory of finite-time shock acceleration, which for long times (or an unusually fast acceleration timescale) tends to the steady-state result of a power-law spectrum. We present analytic and numerical models of finite-time shock acceleration. For a given injection momentum p0, after a very short time there is only a small boost in momentum, at intermediate times the spectrum is a power law with a hump and steep cutoff at a critical momentum, and at longer times the critical momentum increases and the spectrum approaches the steady-state power law. The composition dependence of the critical momentum is different from that obtained for other cutoff mechanisms." @default.
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- W188665776 date "2003-07-01" @default.
- W188665776 modified "2023-09-26" @default.
- W188665776 title "Finite-Time Shock Acceleration" @default.
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