A Self-consistent Model of Alfvén Wave Phase Mixing G.KIDDIE, I. DE MOORTEL, P.CARGILL & A.HOOD.

A Self-consistent Model of Alfven Wave Phase Mixing

A Self-consistent Model of Alfvn Wave Phase MixingG.kiddie, i. de moortel, p.Cargill & A.hood

Phase Mixing Occurs when Alfvn waves are travelling in an inhomogeneous plasma This leads to the creation of strong gradients which enhance the visco-resistive damping First suggested by Heyvaerts & Priest (1982) Require weak damping and strong phase mixing Heating is focused at edges of loops

Coupling of Corona and Chromosphere

We consider the effect of including the coupling of the corona and chromosphere in a phase mixing experimentMost models dont consider relationship between corona, chromosphere and heatingThe dependence of heating on density is a direct consequence of the dynamic coupling

HeatingOfman et al. (1998) Considered the coupling of the corona and chromosphere with a resonant absorption experiment This interaction moves the resonance layer around, leads to spatially bursty heating

Modelxyz

Scaling Laws6Introduction of Density Feedback

Introduction of Density Feedback

8Damping Timescale

Lower density The effect is small, simplest method is to enhance the effect is to decrease the density Now enough energy in the wave to power the background atmosphere

Density is now greatly enhanced via feedback mechanism Resolution is lost before the wave has fully dampedLower density

Driven CaseIdeal Case Initially test with resistivity switched off Complex chequered pattern where reflected wave interferes with outward propagating wave

Ideal Case Additional gradients created by reflecting wave

Current Investigate how the current changes with this reflection Current becomes very difficult to resolve

Conclusions Alfvn waves deposit heat in the solar atmosphere By considering the mass exchange between corona and chromosphere this heat can be spread The effect is not big using coronal parameters Situation even more complex when considering driven waves