Figure 16-27: R I V U X G
The Active Sun Seen through an Hα Filter This image was made using a red filter that only passes light at a wavelength of 656 nm. The spectrum of the photosphere has an absorption line at this wavelength and so appears dark. Hence, this filter reveals the chromosphere. Prominences, plages, and filaments are associated with strong magnetic fields.
The Active Sun Seen through an Hα Filter This image was made using a red filter that only passes light at a wavelength of 656 nm. The spectrum of the photosphere has an absorption line at this wavelength and so appears dark. Hence, this filter reveals the chromosphere. Prominences, plages, and filaments are associated with strong magnetic fields.
(NASA)