Spicules are small, narrow jets of plasma that shoot up from the chromosphere, the layer of the Sun's atmosphere above the photosphere. They can reach heights of up to 10,000 kilometers (6,200 miles) and last for about 5 to 15 minutes.
There are two main types of spicules:
* Type I spicules: These are the most common type, and they are characterized by their relatively slow upward motion.
* Type II spicules: These are rarer and faster, with speeds that can reach up to 100 kilometers per second.
While spicules are relatively small, they are important for understanding the Sun's atmosphere and how energy is transported from the photosphere to the corona.
