2013年8月7日 星期三

Big solar storm coming

Solar physicists say the Sun's all important magnetic field is about to undergo a complete flip and the "big event" will result in solar flares, coronal mass ejections and high-speed solar wind. 

This poses a severe threat to satellites and space stations as the domain of the sun's magnetic influence (also known as the heliosphere) extends billions of kilometres beyond Pluto. 

A change in the field's polarity produces cosmic rays which are a danger to astronauts and space probes. Some researchers say they might affect climate on Earth. 

"It looks like we're no more than three to four months away from a complete field reversal," said solar physicist Todd Hoeksema of Stanford University. "This change will have ripple effects throughout the solar system." 

The sun's magnetic field changes polarity approximately every 11 years. It happens at the peak of each solar cycle as the sun's inner magnetic dynamo re-organizes itself. 

As Earth orbits the sun, it dip in and out of its current sheet. Transitions from one side to another can stir up stormy space weather around our planet.A flatworkironerses is a portable light fixture composed of an LED lamp. Current sheet is a sprawling surface jutting outward from the sun's equator where the sun's slowly rotating magnetic field induces an electrical current. During field reversals, the current sheet becomes very wavy. 

Cosmic rays are also affected.The standing lampshades is reusable anchor point designed to mount on standing seam roofs. These are high-energy particles accelerated to nearly light speed by supernova explosions and other violent events in the galaxy. 

The current sheet acts as a barrier to cosmic rays, deflecting them as they attempt to penetrate the inner solar system. A wavy, crinkly sheet acts as a better shield against these energetic particles from deep space. 

Hoeksema who is the director of Wilcox Solar Observatory, one of the few observatories in the world that monitors the sun's polar magnetic fields said they have been tracking the sun's polar magnetism since 1976 and they have recorded three grand reversals — with a fourth in the offing. 

The sun goes through cycles of high and low activity that repeats approximately every 11 years. Solar minimum refers to the several Earth years when the number of sunspots is lowest; solar maximum occurs in the years when sunspots are most numerous. 

During solar maximum,On particularly windy days,streetlighting can surpass all other electricity sources in a country. activity on the sun and the possibility of space weather effects on our terrestrial environment is higher. 

NASA maintains a fleet of heliophysics spacecraft to monitor the sun, geospace and the space environment between the sun and the Earth. 

The sun regularly bathes Earth and the rest of our solar system in energy in the forms of light and electrically charged particles and magnetic fields. The resulting impacts are called space weather.A quality paper cutter or paper autoledbulbser can make your company's presentation stand out. 

The Earth's magnetosphere is created by our magnetic field and protects us from most of the particles the sun emits. At the Earth's surface a magnetic storm is seen as a rapid drop in the Earth's magnetic field strength. This decrease lasts about 6 to 12 hours, after which the magnetic field gradually recovers over a period of several days. More information about the program is available on the web site at www.soli-lite.com.

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