Today is the 40th Anniversary of Earth Day. The environmentally-themed day was “founded by U.S. Senator Gaylord Nelson [of Wisconsin] as an environmental teach-in held on April 22, 1970.” Of course, everyday should be Earth Day, but today represents a special remembrance of where our livelihoods, our goods and services, or our well-being derives. The images below represent a mere sample of Earth’s unique possessions, and these images are a reminder of why it’s important to conserve our one and only home and her unique natural possessions.
Environment-themed art with a message (click on any image to enlarge it):
The Earth’s magnetosphere protects the Earth and its life from the Sun’s solar activity (think the shields portrayed in Star Trek). However, our protective blanket may be resulting in activity that is leaking our atmosphere into space—slowly. From New Scientist:
At the poles, the magnetosphere might be aiding loss of the atmosphere, according to Stas Barabash of the Swedish Institute of Space Physics in Kiruna, who is principal investigator for the European Space Agency’s Venus Express mission. Barabash bases his suggestion on measurements of the flow of ions escaping from Venus, Mars and Earth. It is thought that Venus has never had a magnetosphere, whereas Mars did until its magnetic dynamo wound down 3.5 billion years ago.
Taking into account the different masses of the three planets, their atmospheric make-up and their distance from the sun, Barabash compared the rate of loss of oxygen ions from each one. He focused on oxygen ions because these are the most abundant ions in the ionospheres of all three planets. He found that Earth lost oxygen around three times as fast as the other planets.
Barabash points out that a planet’s magnetosphere will always be far larger than the planet itself or its atmosphere. This, he reasons, means that a planet with a magnetic field will absorb more energy from the solar wind than it would if it didn’t have one. This extra energy would be funnelled down towards the magnetic poles, so molecules in the ionosphere above these regions could be accelerated enough to escape (see diagram). Barabash presented the results this month at the International Conference on Comparative Planetology at Noordwijk in the Netherlands.
The idea is supported by past studies of the magnetosphere, such as the European Space Agency’s Cluster mission, which have shown that ions escape from the Earth’s poles at twice the rate or more compared with the average for the planet as a whole.
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