Saturn has a magnetic field very different from Earth’s magnetosphere, new research suggests. The ringed gas’s wonky magnetic shield may be caused by its rapid rotation (a day on Saturn lasts only 10.7 hours), and the effects of its moons, especially the sea ice moon Enceladus.
The team that conducted this research reached these findings when analyzing six years of data on Saturn collected by the Cassini spacecraft, which orbited the gas giant between 2004 and 2017. The purpose of this research was to find where Saturn’s gravity begins to turn back to the poles of the planet, where the funnels charge particles known as “magnetic points” in the atmosphere.
“A better understanding of Saturn’s environment is urgently needed now that plans for our return to Saturn and its moon Enceladus are being developed,” team member Andrew Coates of the University of London’s Mullard Space Science Laboratory said. a statement. “These results feed the excitement that we are going back there. This time we will look for evidence of habitation and see signs of life.”
Enceladus is one such species
Saturn is the second largest planet in the planetary system after Jupiter, and Saturn’s gravitational field is ten times wider than the gas giant itself. This new research found that its imbalance is a result of the planet’s rapid rotation and the fact that, as it spins, Saturn drags a heavy soup of plasma around it.
This issue is caused by the gases produced by the Saturnian moons, especially Enceladus, which is known to spray ice droplets from the bottom of the ocean.
“This study also provides strong evidence for a long-standing theory – that the rapid acceleration of large planets such as Saturn and active moons replaces the solar wind as the main force that creates magnetospheres. It shows that the magnetosphere of Saturn, as well as the magnetospheres of other fast gas layers, may be completely different from the Earth. “Enceladus itself is an important driver of this environment, it emits a lot of vapor of “The water that comes in, infuses the magnetosphere with heavy plasma that is then pulled away as the planet spins.”
Team leader Zhonghua Yao of the University of Hong Kong explained that the difference between the structure of Saturn’s magnetic field and that of Earth’s magnetosphere points to a fundamental collective process that controls how the outflow of charged particles from the sun, known as the solar wind, interacts with the various planets.
The discovery could be important in understanding how interstellar winds interact with planets outside the solar system.
“Global observations reveal the workings of the Earth, while comparative studies between planets inform us of fundamental laws that can be used to understand other systems, such as exoplanets,” said Yao.
Most useful to Yao and colleagues was data from Cassini’s two instruments, the Cassini Magnetometer (MAG) and the Cassini Plasma Spectrometer (CAPS), both of which observed events in which the spacecraft passed through Saturn’s magnetic field.
This revealed 67 such incidents between 2004 and 2010.
Using this to simulate Saturn’s magnetic field, the team found that the way the solar wind interacts with the ringed planet’s magnetosphere is similar to the way it interacts with its gas giant, Jupiter.
The team’s research was published Wednesday (April 1) in the journal Nature Communications.
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