Infrared Imaging of Sunspots and Faculae at the Photospheric Opacity Minimum

摘要: Continuum observations at 1.63-microns using a PtSi IR CCD camera have yielded images of the deepest observable layers in an active region. When these are compared with spectroheliograms visible continuum and Ca K wing, it becomes evident that faculae seen near disk center as low-contrast, dark structures; also, ratio umbral intensity for small relative to large spots is substantially lower 1.63 microns than red continuum. These findings suggest that, layers, well contain plasma which cooler surrounding photosphere equal optical depth; they can be explained straightforwardly if flux tubes all diameters exhibit convective heat flow along their axes. 19 references.