Scientists Uncover Origins of Dynamic Jets on Sun's Surface
Released on June 22, 2017
At any given moment, as many as 10 million wild jets of solar material burst from the sun’s surface. They erupt as fast as 60 miles per second, and can reach lengths of 6,000 miles before collapsing. These are spicules, and despite their grass-like abundance, scientists didn’t understand how they form. Now, for the first time, a computer simulation — so detailed it took a full year to run — shows how spicules form, helping scientists understand how spicules can break free of the sun’s surface and surge upward so quickly.
This work relied upon high-cadence observations from NASA’s Interface Region Imaging Spectrograph, or IRIS, and the Swedish 1-meter Solar Telescope in La Palma. Together, the spacecraft and telescope peer into the lower layers of the sun’s atmosphere, known as the interface region, where spicules form. The results of this NASA-funded study were published in Science on June 22, 2017 — a special time of the year for the IRIS mission, which celebrates its fourth anniversary in space on June 26.
A computer model simulation of spicules. Spicule-like features appear as dense, cool intrusions in the hot corona, originating from the boundaries of the strong magnetic regions. (A/top half of video) Temperature and (B/bottom half of video) density maps are shown on a logarithmic color map with white magnetic field lines (A) and black contours where plasma β = 1 (B). t, time.
Observations of spicules from NASA's Solar Dynamics Observatory, or SDO. Over a few hours observation of the northern pole area of the Sun in extreme ultraviolet light (Aug. 3, 2010), we can see a continual frenzy of spicules.