December 14,
2007
Is a
New Solar Cycle Beginning? (NASA Feature)
The
solar physics community is abuzz this week. No, there haven't
been any great eruptions or solar storms. The source of the excitement
is a modest knot of magnetism that popped over the sun's eastern
limb on Dec. 11th, pictured below in a pair of images from the
orbiting Solar and Heliospheric Observatory (SOHO). It may not
look like much, but "this patch of magnetism could be a sign
of the next solar cycle," says solar physicist David Hathaway
of the Marshall Space Flight Center
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more...
Image
Credit: SOHO (ESA & NASA)
December
6, 2007
The Sun is Bristling with X-ray Jets (NASA Feature)
Astronomers
using Japan's Hinode spacecraft have discovered that the sun is
bristling with powerful "X-ray jets." They spray out
of the sun's surface hundreds of times a day, launching blobs
of hot gas as wide as North America at a top speed of two million
miles per hour. These jets add significant mass to the solar wind
and they may help explain a long-standing mystery of astrophysics:
the superheating of the sun's corona.
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more...
Image
Credits: JAXA