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Corey S Powell (coreyspowell@mastodon.social)'s status on Wednesday, 31-Jan-2024 20:47:49 JST Corey S Powell

Saturn seen in ultraviolet light -- a very different look for the ringed planet.
In this Hubble image, the bright middle zone shows that Saturn's rings are heating up the planet's atmosphere.
How does that work? Scientists haven't figured it out yet...
https://hubblesite.org/contents/news-releases/2023/news-2023-009 #space #astronomy #science #art
In conversation about 10 months ago from mastodon.social permalink
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  http://planet.In/
2. This is a composite image showing the Saturn Lyman-alpha bulge, an emission from hydrogen which is a persistent and unexpected excess detected by three distinct NASA missions, namely Voyager 1, Cassini, and the Hubble Space Telescope between 1980 and 2017. The rings appear much darker than the planet's body because they reflect much less ultraviolet sunlight. Above the rings and the dark equatorial region, the Lyman-alpha bulge appears as an extended (30 degree) latitudinal band that is 30 percent brighter than the surrounding regions. A small fraction of the southern hemisphere appears between the rings and the equatorial region, but it is dimmer than the northern hemisphere. North of the bulge region (upper-right portion of image), the disk brightness declines gradually versus latitude toward the bright aurora region that is here shown for reference (not at scale). A dark spot inside the aurora region represents the footprint of the spin axis of the planet. It's believed that icy rings particles raining on the atmosphere at specific latitudes and seasonal effects cause an atmospheric heating that makes the upper atmosphere hydrogen reflect more Lyman-alpha sunlight in the bulge region. This unexpected interaction between the rings and the upper atmosphere is now being investigated in depth.
  https://files.mastodon.social/media_attachments/files/111/847/541/325/416/959/original/51d21a7acbc2bbbe.png

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