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Posts Tagged ‘troposphere’

Earth’s Tallest Lightning Seen in Unprecedented Detail

July 27, 2011 Comments off

ouramazingplanet

jet lightningTrees form a horizon from which a gigantic jet emerges; the thunderstorm is 200 miles away. Credit: Steven Cummer

Mysterious and gigantic jets of lightning that shoot up to near the edge of space have now been observed in unprecedented detail, revealing just how much charge they pack and how they form.

More than 50 miles (80 kilometers) above Earth’s surface, extreme ultraviolet radiation from the sun reacts with air molecules to produce highly charged particles, generating an energetic region known as the ionosphere.

In 2001, scientists discovered gigantic jets of lightning arcing up from clouds in the lowest portion of the atmosphere, the troposphere, to the ionosphere. These rarities apparently are caused by Read more…

Study finds global warming over past 400 years was due to increased Solar activity

June 9, 2011 Comments off

joannenova

Apparently previous studies of the sun-climate connection looked at the equatorial polar magnetic field which produces sun spots, but they did not consider the polar magnetic component of the solar dynamo. The polar fields are less strong than the equatorial fields, but it is claimed that the total magnetic fluxes of both fields are comparable. With proxy data they derive an empirical relation between tropospherical temperatures and solar equatorial and polar magnetic fields. The polar field could contribute about Read more…