A Mach Number Behind a Slow Shock (Ahead a Fast

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Presentation transcript:

A Mach Number Behind a Slow Shock (Ahead a Fast Shock) Surface in a Reconnection Region Takehiro Miyagoshi & Takaaki Yokoyama ApJ, 2004, in press.

１．２． Choromosphere Reconnection Outflow Reconnection Region Emerging Flux Reconnection, Conduction Choromosphere Reconnection Outflow Reconnection Region Heat Conduction ３． Choromospheric Evaporation, Jet Evaporation Flow

How is a mach number expressed?

The slow shocks are regarded as switch-off shocks. We approximate here the fast shock is a perpendicular hydrodynamic shock.

The Loop Top Temperature and The Sound Speed in the Region 2 The balance between the heating rate and the conduction cooling rate

Magnetic Energy Conversion through Slow Shock Surface (switch-off limit) The 60% of released magnetic energy becomes kinetic energy. (Magnetic Reconnection, pp.133, Priest & Forbes, 2000)

Slow Shock --- Large Angle Switch-Off Shock Jump Condition 2 1 また無視できる項を省略する）

The Mach Number X: density ratio (slow shock surfce) For a low-β switch-off shock

A mach number is expressed with only region 1 values. This equation predicts… Mf~2.1 Numerical simulation results show that… Shock surface The location along the red line versus Mach number Mf X point

Parameter Dependence Numerical simulation results show that… 0.2 0.5 This gives the intensity of the fast shocks. This estimation can also apply to the situation of a loop top source region of a flare. We expect that our result will be confirmed by the detail observation of coronal jets and flares by Solar-B.

おまけ t=108 t=126