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The Advanced Space-based Solar Observatory (ASO-S) is the first approved solar space mission in China. This special issue includes a total of 13 papers, which were selected from presentations at the First ASO-S InternationalWorkshop, held in Nanjing from 2019 January 15 to 18. Taken together, these 13 papers provide a complete description of ASO-S until the end of Phase-B and the beginning of Phase-C.

Observations from multiple spacecraft show that there are energy spectral "breaks" at 1-10MeV in some large CME-driven shocks. However, numerical models can hardly simulate this property due to high computational expense. The present paper focuses on analyzing these energy spectral "breaks" by Monte Carlo particle simulations of an isolated CME-driven shock. Taking the Dec 14 2006 CME-driven shock as an example, we investigate the formation of this energy spectral property. For this purpose, we apply different values for the scattering time in our isolated shock model to obtain the highest energy "tails", which can potentially exceed the "break" energy range. However, we have not found the highest energy "tails" beyond the "break" energy range, but instead find that the highest energy "tails" reach saturation near the range of energy at 5MeV. So, we believe that there exists an energy spectral "cut off" in an isolated shock. If there is no interaction with another shock, there would not be formation of the energy spectral "break" property.

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