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Unveiling Saturn’s Secrets: Eclipses Reveal Ring Transparency

November 14, 2023
in Science
Unveiling Saturn’s Secrets: Eclipses Reveal Ring Transparency
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Groundbreaking Science Emerges from Ultra Close Orbits of Saturn

A researcher has innovatively measured the optical depth of Saturn’s rings using Cassini spacecraft data, providing new insights into their transparency and structure. (Illustration of NASA’s Cassini spacecraft in orbit around Saturn.) Credit: NASA/JPL-Caltech

A Lancaster University PhD student has measured the optical depth of Saturn’s rings using a new method based on how much sunlight reached the Cassini spacecraft while it was in the shadow of the rings.

The optical depth is connected to the transparency of an object, and it shows how far light can travel through that object before it gets absorbed or scattered.

Cassini Mission and Research Collaboration

The research, led by Lancaster University in collaboration with the Swedish Institute of Space Physics, was recently published in the Monthly Notices of the Royal Astronomical Society.

The NASA-ESA Cassini spacecraft was launched in 1997 and reached Saturn in 2004, carrying out the most extensive survey of the planet and its moons to date. The mission ended in 2017 when Cassini plunged into the Saturnian atmosphere, after diving 22 times between the planet and its rings.

Video of the Cassini spacecraft moving through the plane of Saturn’s ring system, created by George Xystouris using NASA Eyes. Credit: NASA/JPL

Methodology and Findings

Lancaster University PhD student George Xystouris, under the supervision of Dr. Chris Arridge, analyzed historic data from the Langmuir Probe onboard Cassini, an instrument that was measuring the cold plasma, i.e., low energy ions and electrons, in the magnetosphere of Saturn.

For their study, they focused on solar eclipses of the spacecraft: periods where Cassini was in the shadow of Saturn or the main rings. During each eclipse, the Langmuir Probe recorded dramatic changes in the data.

George said: “As the probe is metallic, whenever it is sunlit, the sunlight can give enough energy to the probe to release electrons. This is the photoelectric effect, and the electrons that are released are so-called ‘photoelectrons. They can create problems though, as they have the same properties as the electrons in the cold plasma around Saturn and there is not an easy way to separate the two.”

“Focusing on the data variations we realized that they were connected with how much sunlight each ring would allow to pass. Eventually, using the properties of the material that the Langmuir Probe was made of, and how bright the Sun was in Saturn’s neighborhood, we managed to calculate the change in the photoelectrons number for each ring, and calculate the optical depth of Saturn’s rings.

“This was a novel and exciting result! We used an instrument that is mainly used for plasma measurements to measure a planetary feature, which is a unique use of the Langmuir Probe, and our results agreed with studies that used high-resolution imagers to measure the transparency of the rings.”

Future Visibility of Saturn’s Rings

Τhe main rings, which extend up to 140,000 km (90,000 miles) from the planet, but have a maximum thickness of only 1 km (0.6 miles), are to disappear from view from Earth by 2025. In that year the rings will be tilted edge-on to Earth, making it almost impossible to view them. They will tilt back towards Earth during the next phase of Saturn’s 29-year orbit and will continue to become more visible and brighter until 2032.

Professor Mike Edmunds, the President of the Royal Astronomical Society, added: “It is always good to see a postgraduate student involved in using space probe instrumentation in an unusual and inventive way. Innovation of this kind is just what is needed in astronomical research – and an approach which many former students who are in a variety of careers are applying to help address the world’s problems.”

Reference: “Estimating the optical depth of Saturn’s main rings using the Cassini Langmuir Probe” by Georgios Xystouris, Christopher S Arridge, Michiko M Morooka and Jan-Erik Wahlund, 18 September 2023, Monthly Notices of the Royal Astronomical Society.
DOI: 10.1093/mnras/stad2793

>>> Read full article>>>
Copyright for syndicated content belongs to the linked Source : SciTechDaily – https://scitechdaily.com/unveiling-saturns-secrets-eclipses-reveal-ring-transparency/

Tags: Saturn'sscienceUnveiling
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