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• W2890036209 abstract "The possibility that charged particles are accelerated statistically in a sea of small-scale interacting magnetic flux ropes in the supersonic solar wind is gaining credence. In this Letter, we extend the Zank et al. statistical transport theory for a nearly isotopic particle distribution by including an escape term corresponding to particle loss from a finite acceleration region. Steady-state 1D solutions for both the accelerated particle velocity distribution function and differential intensity are derived. We show Ulysses observations of an energetic particle flux enhancement event downstream of a shock near 5 au that is inconsistent with the predictions of classical diffusive shock acceleration (DSA) but may be explained by local acceleration associated with magnetic islands. An automated Grad-Shafranov reconstruction approach is employed to identify small-scale magnetic flux ropes behind the shock. For the first time, the observed energetic particle time-intensity profile and spectra are quantitatively compared with theoretical predictions. The results show that stochastic acceleration by interacting magnetic islands accounts successfully for the observed (i) peaking of particle intensities behind the shock instead of at the shock front as standard DSA predicts; (ii) increase in the particle flux amplification factor with increasing particle energy; (ii) increase in distance between the particle intensity peak and the shock front with increasing energy; and (iv) hardening of particle power-law spectra with increasing distance downstream of the shock." @default.
• W2890036209 created "2018-09-27" @default.
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• W2890036209 date "2018-09-11" @default.
• W2890036209 modified "2023-10-10" @default.
• W2890036209 title "An Unusual Energetic Particle Flux Enhancement Associated with Solar Wind Magnetic Island Dynamics" @default.
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• W2890036209 doi "https://doi.org/10.3847/2041-8213/aaddf6" @default.
• W2890036209 hasPublicationYear "2018" @default.
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