Hyperspectral solar observation based onthe sodium atomic filter

This paper introduces the principle of hyperspectral solar imaging observations based on atomic filters and their transmission properties. The full disk solar images of the upper photosphere and the lower chromosphere are obtained. Compared with the conventional interference filters, the transmission peak of sodium atomic filters just corresponds to the center of solar Fraunhofer D 2 line, which is in favor of long-term and stable solar observations with a high spectral resolution; its ultra-narrow bandwidth is more beneficial to the detailed observation of the solar atmosphere, such as the plages and bright network structures. The details of the observed solar structures using our atomic filter (at 589 nm) in Wuhan are very similar to those obtained by SDO satellite (at 160 nm), since the two wavelengths are formed at similar heights. Our experiments demonstrate that the atomic filters can provide an effective method for hyperspectral solar imaging observations.