Latest Polar vortex Stories
Cassini's spectacular image of Saturn's polar vortex, published this month by NASA, may provide astronomers with a missing piece in the puzzle of how that planet's atmosphere works. For planetary scientists studying Venus, the image was strangely familiar.
Ozone measurements made by ESAâ€™s Envisat satellite have revealed the ozone loss of 40 million tonnes on October 2, 2006 has exceeded the record ozone loss of about 39 million tonnes for 2000.
This season's Antarctic ozone hole has swollen to an area of ten million square kilometres from mid-August - approximately the same size as Europe and still expanding. It is expected to reach maximum extent during September, and ESA satellites are vital for monitoring its development.
Despite near-record levels of chemical ozone destruction in the Arctic this winter, observations from NASA's Aura spacecraft showed that other atmospheric processes restored ozone amounts to near average and stopped high levels of harmful ultraviolet radiation from reaching Earth's surface.
Titan's atmospheric winds, temperature and mixing have been revealed by new observations from the Cassini spacecraft. The thick atmosphere of Saturn's giant moon is rich in organic compounds, whose chemistry may be similar to that which occurred on Earth before the emergence of life.
A new study partially funded by NASA and using data from several NASA instruments has shown that those late 2003 solar storms, which deposited huge quantities of energetic solar particles into Earth's atmosphere, combined forces with another natural atmospheric process last spring to produce the largest decline ever recorded in upper stratospheric ozone over the Arctic and the northern areas of North America, Europe and Asia.
NASA astronomers using the Keck I telescope in Hawaii are learning much more about a strange, thermal "hot spot" on the tip of Saturn's south pole.
- A volcanic mudflow.