Blog Archives

Elusive Red Sprite Seen From the Space Station

NASA photo ISS044-E-45576 showing storms over southern Mexico on Aug. 10, 2015. (NASA/JSC)

NASA photo ISS044-E-45576 showing storms over southern Mexico on Aug. 10, 2015. (NASA/JSC)

Let’s take a look back at our own planet for a moment with this stunning photo captured from the Space Station. This shot, taken on the night of Aug. 10, 2015, shows lightning flashes in thunderstorms over southern Mexico. Along the right edge bright red and purple streamers can be seen extending high into the atmosphere above a particularly powerful flash: a full-on “red sprite” caught on camera!

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Storms on Uranus Observed From Hawaii

Infrared image of Uranus acquired from the Keck Observatory on Aug. 6 2014 (Imke de Pater (UC Berkeley)/Keck Observatory) Colored with Voyager true-color data.

Infrared image of Uranus acquired from the Keck Observatory on Aug. 6 2014 (Imke de Pater (UC Berkeley)/Keck Observatory) Colored with Voyager 2 true-color data.

Wrapped in an atmosphere tinted pale blue by high-altitude methane, Uranus has occasionally been observed to develop large storms in its frigid windy skies. NASA’s Voyager 2 saw a few small storm clouds spotting Uranus during its flyby in Jan. 1986, and more recently some large but short-lived storms were observed by Hubble and the W.M. Keck Observatory as the planet moved toward its equinox in 2007. Now, seven years after its equinox, swirling storms are once again blooming on Uranus — and Keck astronomers have caught them on camera (while preparing for terrestrial hurricanes to make landfall!)

Read more in my article on Discovery News here.

Saturn’s Stunning, Swirling Cyclone

Saturn’s north polar cyclone (NASA/JPL/SSI)

Oh man. It’s stuff like this that got me into space blogging in the first place.

Landing here on Earth last night, this is one of several new raw images from Cassini acquired yesterday (Nov. 27) showing the enormous cyclone of clouds swirling around Saturn’s geographic north pole. The angle of sunlight highlights the multilayered structure of the cyclone and surrounding cloud bands wonderfully… this is a roiling feature approximately 3-4,000 km across and in places appears to carve cloud channels hundreds of kilometers into Saturn’s atmosphere. Simply. Beautiful.

It’s been a while since we’ve gotten such a good look at Saturn’s north pole… over four years ago, I’d say, and in fact one of my very first blog posts here on LITD was of the hexagonal feature ringing Saturn’s northern hemisphere. Thanks to Cassini’s new orbital trajectory, which is taking it high over the ring plane and poles of Saturn, we have the opportunity to view the gas giant’s upper latitudes again.

In fact we even have a brand new look at the hexagon, which is still there, four years later:

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Saturn’s “Storm Alley”

Cassini image of Saturn's stormy southern equatorial belt

Dark swirling vortices march along Saturn’s “storm alley” in this section of an image taken by Cassini on May 19, 2008. (It was recently uploaded as a featured image on JPL’s Flickr page.)

Storms on Saturn are huge and powerful, with winds blowing many hundreds of miles per hour and often featuring lightning ten thousand times stronger than any seen on Earth. The storms often occur as eddies within Saturn’s jet streams – the atmospheric bands that carry clouds east or west around the planet. Research has discovered that, rather than being created by the friction of the jet streams, Saturn’s storms actually power the jet streams, since they tend to travel along with them. Scientists speculate that this process is what helps Saturn maintain its atmospheric bands and high winds.

The image above is a crop of the original, and I sharpened it and adjusted the curves to enhance detail. The texture in the clouds is often referred to as “coffee-and-cream”, resembling the delicate swirls seen in a hot cup of cappuccino. Make mine a venti!

Image credit: NASA / JPL / Space Science Institute.

Methane Skies

Saturn as seen through a methane filter

Saturn as seen through a methane filter

In this raw image from Cassini, giant scallop-edged cloud patterns become visible in Saturn’s atmosphere with camera filters specially designed to detect methane. Light and dark banding of the clouds at various latitudes are also extremely distinctive through this filter.

Although mostly hydrogen and helium, Saturn’s atmosphere does contain elements like methane and ammonia.

Saturn’s atmosphere constantly churns with huge eddying storms and powerful jet streams, moving with winds traveling hundreds of miles per hour. While once it was believed the jet streams powered the eddies, it’s now believed the case is just the opposite…the storms are contributing power into the jet streams, which then help spawn new storms.

Image: NASA/JPL/Space Science Institute

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