论文标题
利用亮度温度连续体的斜率作为太阳ALMA观测的诊断工具
Utilizing the slope of the brightness temperature continuum as a diagnostic tool of solar ALMA observations
论文作者
论文摘要
来自太阳大气的毫米波长处的辐射强度与血浆温度密切相关，辐射的形成高度取决于波长。因此，亮度温度的斜率（t $ _ \ mathrm {b} $）连续体样品，采样了太阳大气中采样层的气温的局部梯度。我们使用Atacama大毫米/亚毫米阵列（ALMA）中的太阳观测，并根据合成观察者之间的差异（2.8-3.2 mm; band 3）和（1.8-3.2 mm; band 3）和（1.20-1.20-1.20-1mmMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM; RMHD模拟。连续体的斜率与小规模动力学耦合，正符号表明温度升高，高度升高，而负符号则意味着减少。网络贴片以大型正斜率为主，而安静的太阳区域则显示出正斜率和负斜率的混合物，这与传播冲击波有关，因此可以使用斜率的时间演变来识别冲击。亮度温度的斜率可观察到与ALMA观测值相对应的角度分辨率。模拟还表明，两个频段3和6的辐射可以同时从不同高度处的几个组件来源，并且两个波长之间的冲击签名的延迟不一定反映了传播速度，而是由上述图层的不透明度变化率不同。 T $ _ \ Mathrm {B} $ Continuum在不同的ALMA接收器子带上采样的斜率是大气中采样高度的局部浆体温度斜率的指示，这提供了新的诊断可能性，可提供测量基础特性的新诊断可能性。
The intensity of radiation at millimeter wavelengths from the solar atmosphere is closely related to the plasma temperature and the height of formation of the radiation is wavelength dependent. From that follows that the slope of the brightness temperature (T$_\mathrm{b}$) continuum, samples the local gradient of the gas temperature of the sampled layers in the solar atmosphere. We use solar observations from the Atacama Large Millimeter/sub-millimeter Array (ALMA) and perform estimations and prediction of the slope of the T$_\mathrm{b}$ continuum based on differences between synthetic observables at different ALMA receiver sub-bands (2.8-3.2 mm; band 3) and (1.20-1.31 mm; band 6) from a state-of-the-art 3D rMHD simulation. The slope of the continuum is coupled to the small-scale dynamics and a positive sign indicates an increase in temperature with height while a negative sign implies a decrease. Network patches are dominated by large positive slopes while quiet Sun region show a mixture of positive and negative slopes, much in connection to propagating shock waves and the temporal evolution of the slopes can therefore be used to identify shocks. The observability of the slope of brightness temperatures is estimated for angular resolutions corresponding to ALMA observations. The simulations also show that the radiation of both bands 3 and 6 can origin from several components at different heights simultaneously and that the delay of shock signatures between two wavelengths does not necessarily reflect the propagation speed, but could be caused by different rate of change of opacity of above-lying layers. The slope of the T$_\mathrm{b}$ continuum sampled at different ALMA receiver sub-bands serves as indicator of the slope of the local plasma temperature at the sampled heights in the atmosphere, which offers new diagnostic possibilities to measure the underlying physical properties.
