AI 中文总结
研究以DKIST观测的光球层KH涡旋为对象，估算其作为跨尺度等离子体加热驱动源的可能性，推导相关能量、磁场及加热数据，提出需检验向上传输的结论。
AI 中文摘要
丹尼尔·井上太阳望远镜（DKIST）已在光球层磁通量边界处分辨出开尔文-亥姆霍兹（KH）涡旋，其特征波长为65千米。本文估算这些涡旋是否能为从光球层到低日冕不同高度的跨尺度等离子体加热提供光球层驱动源。利用模拟的MURaM剪切、密度对比度、500千米垂直延伸范围，结合代表性光球层密度，得到剪切能密度为1.35×10² J·m⁻³，每个特征涡旋的能量为2.2×10²⁴ erg。在理想化计算中，与精确垂直取向（B⊥k）相差1°至7°的磁场仍保持KH不稳定性，并提供可缠绕或压缩成电流层的面内分量。质心剪切储备成为新磁自由能的极限情况给出b_cs=184 G，与理想边际稳定场相同，等效于7.6°的有效扭转，这在电流层中最多存储135 J·m⁻³。利用经验无碰撞重联加热分数0.28至0.44，映射到弱碰撞高度的相同扭转，使离子从光球层的≈20 eV加热到低日冕的≈1.4 keV。对于基于快照的、KH活跃表面占比为0.03的示例情况，宁静太阳和日冕洞的损失分别需要5%至8%和14%至21%的剪切储备成为达到此类高度的重联磁自由能。活跃区域可能需要单独的引导场扭转和 helicity 储备。DKIST尚未测量所需的向上传输，但这是可直接检验的。
英文摘要
The Daniel K. Inouye Solar Telescope (DKIST) has resolved Kelvin--Helmholtz (KH) vortices at photospheric magnetic-flux boundaries with a characteristic wavelength of 65 km. I estimate whether these vortices can supply the photospheric driver for cross-scale plasma heating through reconnection across different heights from photosphere to low-corona. Using the simulated MURaM shear, density contrast, and 500 km vertical extent, together with a representative photospheric density, gives a shear-energy density of $1.35\times10^{2}$ J m$^{-3}$ and $2.2\times10^{24}$ erg per characteristic vortex. Magnetic fields $1^\circ$--$7^\circ$ from the exact perpendicular orientation ($ {\bf{B}}\perp{\bf{k}}$) remain KH unstable in an idealized calculation and provide an in-plane component that can be wound or compressed into current layers. The limiting case, in which the center-of-momentum shear reservoir becomes new magnetic free energy, gives $b_{\rm cs}=184$ G, identical to the ideal marginal-stability field and equivalent to a $7.6^\circ$ effective twist. This stores at most 135 J m$^{-3}$ in the layers. Using empirical collisionless reconnection heating fractions of 0.28--0.44, the same twist mapped to weakly collisional heights gives ion heating from $\approx$20 eV at the photosphere to $\approx$1.4 keV in the low corona. For an illustrative, snapshot-based KH-active surface fraction of 0.03, quiet-Sun and coronal-hole losses require 5--8\% and 14--21\%, respectively, of the shear reservoir to become reconnecting magnetic free energy that reaches such heights. Active regions likely require a separate guide-field twist and helicity reservoir. The required upward transport has not been measured by DKIST, but it is directly testable.
Comments1 figure, 2 tables, 7 pages without references
