Transient behavior of flare-associated solar wind. II - Gas dynamics in a nonradial open field region

Astronomy and Astrophysics – Astrophysics

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Hydrodynamic Equations, Solar Flares, Solar Wind Velocity, Transient Response, Chromosphere, Gas Pressure, Radial Distribution, Shock Fronts, Solar Corona, Solar Temperature, Stellar Models

Scientific paper

Transient behavior of flare-associated solar wind in the nonradial open field region is numerically investigated, taking into account the thermal and dynamical coupling between the chromosphere and the corona. A realistic steady solar wind is constructed which passes through the inner X-type critical point in the rapidly diverging region. The wind speed shows a local maximum at the middle, O-type, critical point. The wind's density and pressure distributions decrease abruptly in the rapidly diverging region of the flow tube. The transient behavior of the wind following flare energy deposition includes ascending and descending conduction fronts. Thermal instability occurs in the lower corona, and ascending material flows out through the throat after the flare energy input ceases. A local density distribution peak is generated at the shock front due to the pressure deficit just behind the shock front.

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