Solar Jets

Various jet-like events observed in the solar atmosphere are described. They vary in size, lifetime, speed, temperature, and ranges of observed emissions. The most numerous and ubiquitous are spicules—thin elongated structures in the solar chromosphere. Surges are larger-scale ejections than spicules, but occur much less frequently. They are usually associated with small, changing satellite sunspots. Larger-scale X-ray jets are associated with subflares and are best observed inside polar coronal holes. This type of jets is also observed in extreme-ultraviolet emission lines. The longest jet-like phenomena are observed in white light using space-born coronagraphs. Modeling of jets is usually associated with magnetic configurations that include a null point, near which magnetic reconnection is possible and plasma flows can be redirected.