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Electron Densities of High-Temperature Coronal Loops

机译：高温冠状环的电子密度

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Yohkoh has revealed the existence of persistent high temperature plasmas in solar active regions where major flare activity takes place. Density at the energy release site for coronal heating determines the efficiency of magnetic heating, and hence the heating energy flux. Temperatures and densities of solar (and stellar) flares at the pre-flare states are compiled. Preflare conditions are basically derived from the data taken with the same instruments several tens of minutes before the onset of the impulsive phase of subsequent flares. It is found that the temperature increase from the preflare to flare states is only Δlog T ~ 0.2, and that density and flux increases are roughly independent of the flare thermal energy. Namely large flares take place at the coronal loops where both temperatures and densities are already high. Several line pairs exist in the EIS observing wavelengths, which are suitable for plasma density diagnostics, covering wider temperature ranges. Combining with the emission measure information, "differential" filling factors will reveal the fundamental structures of coronal loops proceeding to abrupt magnetic activity.
机译：Yohkoh已经揭示了在太阳能活动区域中存在持久的高温等离子体，其中发生了主要的火炬活动。用于冠状加热的能量释放部位的密度决定了磁加热的效率，从而确定了加热能量通量。编制了前爆发状态的太阳能（和恒星）耀斑的温度和密度。前迹条件基本上来自于在随后喇叭形的脉冲阶段开始前几十分钟拍摄的数据。结果发现，从前迹线到闪光状态的温度增加仅是ΔLoGt〜0.2，并且该密度和磁通量增加大致独立于火光热能。很大的耀斑在冠状圈发生，其中温度和密度已经很高。在EIS观察波长中存在几个线对，其适用于等离子体密度诊断，覆盖更宽的温度范围。结合排放量度信息，“差异”填充因子将揭示冠状环的基本结构，突然磁性活动。

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