A new photo of Saturn taken by NASA’s Hubble Space Telescope reveals mysterious dark spots on the planet’s rings, known as “ring spokes.” These spokes rotate with Saturn’s icy debris bands. Although scientists have known about these spokes for decades, their exact origin remains uncertain. The strongest theory suggests that the spokes are related to Saturn’s powerful magnetic field and its interaction with the solar wind.
The Voyager 2 space probe first captured images of these ring spokes in 1981, and the Cassini spacecraft observed this mysterious phenomenon while studying the gas giant between 2004 and 2017. Now, Hubble continues to study Saturn’s ring spokes from its position in low Earth orbit.
The spokes disappear during Saturn’s winter and summer solstices but are thought to become more prevalent during the planet’s autumn and spring equinoxes. As NASA approaches the next autumn equinox in Saturn’s northern hemisphere, researchers expect to observe more spokes.
During the equinoxes, Saturn’s rings tilt more towards the Sun. Scientists believe that when the planet is aligned this way, the solar wind – a plasma of high-speed, charged, subatomic particles from the Sun – strikes Saturn’s magnetic field more forcefully. This creates an electrically charged environment that could lead to the formation of spokes. The smallest icy particles in the ring can become charged and float above the rest of the ring, leading to the appearance of spokes.
Hubble’s OPAL program will continue to observe Saturn as it approaches its next equinox. The telescope observes light wavelengths from ultraviolet to near-infrared from Saturn. The data obtained could provide more information on how the spokes form and function. Studying other gas giants in our solar system could reveal whether they have similar ring spokes.
Source: https://www.cioupdate.com.tr/haberler/nasa-hubble-uzay-teleskobu-saturn/
