A new study brings together 40 years of planet-warming data.
“Though the slow disintegration of the rings is well known, its influence on the atomic hydrogen of the planet is a surprise. From the Cassini probe, we already knew about the rings’ influence. However, we knew nothing about the atomic hydrogen content,” astronomer and co-author Lotfi Ben-Jaffel of the Institute of Astrophysics in Paris and the Lunar & Planetary Laboratory,“Everything is driven by ring particles cascading into the atmosphere at specific latitudes.
To come to this conclusion, Ben-Jaffel pulled together archival ultraviolet-light observations from four different space missions that studied the ringed planet. During these missions spaced out over 40 years, astronomers dismissed the measurements as noise in the detectors. By 2004, when thearrived on Saturn, it also collected UV data on the atmosphere over a period of several years.
. These precision observations of Saturn helped calibrate the archival UV data from all four of the other space missions that have observed Saturn. He compared the STIS UV observations of Saturn to the distribution of light from multiple space missions and instruments. “When everything was calibrated, we saw clearly that the spectra are consistent across all the missions. This was possible because we have the same reference point, from Hubble, on the rate of transfer of energy from the atmosphere as measured over decades,”
. “It was really a surprise for me. I just plotted the different light distribution data together, and then I realized, wow—it’s the same.”
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