A spicule is a small temporary jet on the surface of the Sun, i.e., from the photosphere. They are very common (ubiquitous), with typically 300,000 in progress at any moment, spread throughout the surface, covering about 1%. They last about 15 minutes and reach heights of 1000s of kilometers. Their velocity is on the order of 20 km/s and their mass flux density is 100 times that of the solar wind. The material generally falls back to the surface, but does contribute material to the chromosphere and solar wind.