Combined Modeling of Acceleration, Transport, and Hydrodynamic Response in Solar Flares. I. The Numerical Model

This is a standard no-reconnection cartoon, suited for another example of a "monolithic" flux tube. Here the wrinkle is to combine a 1D radiation hydrodynamics model, which defines the (vertical?) structure, with a Fokker-Planck treatment of particle transport (which defines the energy distribution along it). Unfortunately the spiral line emerging from the black box on top (actually, a blue box in this cartoon) is meant to represent an electron trajectory rather than an Alfvén wave. Stylistically, this cartoon may seem a bit primitive, but the artist went on to contribute much classier entries.

      As noted in the paper, this treatment (though still deficient in several ways) may handle "evaporation" better because it deals more accurately with low-energy electrons in the source. These result in strong heating (probably monotonically increasing with height, in terms of per-particle energy deposition rate) and thus stronger evaporation than a particle transport model implying heating in discrete layers deeper in the atmosphere.