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Jupiter's Great Red Spot is smaller than ever seen before
Date:
May 15, 2014
Source:
Space Telescope Science Institute
(STScI)
Summary:
Recent Hubble observations confirm that Jupiter's
Great Red Spot, a swirling storm feature larger than Earth, has shrunken to the
smallest size astronomers have ever measured. Jupiter's Great Red Spot is a
churning anticyclonic storm.
...................
Jupiter's trademark Great Red Spot -- a swirling
anticyclonic storm feature larger than Earth -- has shrunken to the smallest
size ever measured. Astronomers have followed this downsizing since the 1930s.
Jupiter's Great Red Spot is a churning anticyclonic storm.
"Recent
Hubble Space Telescope observations confirm that the Great Red Spot (GRS) is
now approximately 10,250 miles across, the smallest diameter we've ever
measured," said Amy Simon of NASA's Goddard Space Flight Center in
Greenbelt, Maryland. Historic observations as far back as the late 1800s gauged
the GRS to be as big as 25,500 miles on its long axis. The NASA Voyager 1 and
Voyager 2 flybys of Jupiter in 1979 measured the GRS to be 14,500 miles across.
Starting in
2012, amateur observations revealed a noticeable increase in the spot's
shrinkage rate. The GRS's "waistline" is getting smaller by 580 miles
per year. The shape of the GRS has changed from an oval to a circle. The cause
behind the shrinking has yet to be explained.
"In our
new observations it is apparent that very small eddies are feeding into the
storm," said Simon. "We hypothesized that these may be responsible
for the sudden change by altering the internal dynamics and energy of the Great
Red Spot."
Simon's team
plans to study the motions of the small eddies and also the internal dynamics
of the GRS to determine if these eddies can feed or sap momentum entering the
upwelling vortex.
In the
comparison images on the right, the Hubble photo at top was taken in 1995, when
the long axis of the GRS was estimated to be 13,020 miles across. In the 2009
photo the GRS was measured at 11,130 miles across.
The full
disk image of Jupiter on the left was taken on April 21, 2014, with Hubble's
Wide Field Camera 3.
Story
Source:
The above
story is based on materials provided by Space Telescope Science Institute (STScI). Note:
Materials may be edited for content and length.
Cite This
Page:
Space Telescope Science Institute
(STScI). "Jupiter's Great Red Spot is smaller than ever seen before."
ScienceDaily. ScienceDaily, 15 May 2014.
<www.sciencedaily.com/releases/2014/05/140515103658.htm>.
