A High Resolution Coronal Imager (Hi-C) image of solar moss, as seen in extreme ultraviolet light (a wavelength of 19.3 nm), where the observed material is at a temperature of between 1.8–3.6 million degrees Fahrenheit (1–2 million degrees Celsius). The region under observation is an area of high magnetic activity, with sunspots located underneath the coronal features. The moss structures are the brightest objects in the image and form the predominant component of the active region. However, the individual moss elements, with diameters of just 190 miles (300km), are relatively small compared to the size of the active region, which is around 190,000 miles (300,000km) square.
R. Morton/H. Morgan