 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
| . |  |
. |
Helsinki (AFP) Sept 28, 2010 The Northern Lights have petered out during the second half of this decade, becoming rarer than at any other time in more than a century, the Finnish Meteorological Institute said Tuesday. The Northern Lights, or aurora borealis, generally follow an 11-year "solar cycle", in which the frequency of the phenomena rises to a maximum and then tapers off into a minimum and then repeats the cycle. "The solar minimum was officially in 2008, but this minimum has been going on and on and on," researcher Noora Partamies told AFP. "Only in the past half a year have we seen more activity, but we don't really know whether we're coming out of this minimum," she added. The Northern Lights, a blaze of coloured patterns in the northern skies, are triggered by solar winds crashing into the earth and being drawn to the magnetic poles, wreaking havoc on electrons in the parts of the atmosphere known as the ionosphere and magnetosphere. So a dimming of the Northern Lights is a signal that activity on the sun which causes solar winds, such as solar flares and sun sports, is also quieting down. For researchers like Partamies, it is the first time they can observe through a network of modern observation stations what happens to this solar cycle when it becomes as badly disrupted as it is now. "We're waiting to see what happens, is the next maximum going to be on time, is it going to be late, is it going to be huge?" Partamies said. During the cycle's peak in 2003, the station on Norway's Svalbard island near the North Pole, showed that the Northern Lights were visible almost every single night of the auroral season, which excludes the nightless summer months. That figure has fallen to less than 50y percent, while the southernmost station, situated in southern Finland, has been registering only two to five instances annually for the past few years.
Share This Article With Planet Earth
Related Links Solar Science News at SpaceDaily
Solar Storms Can Change Directions, Surprising ForecastersHunstville AL (SPX) Sep 23, 2010 Solar storms don't always travel in a straight line. But once they start heading in our direction, they can accelerate rapidly, gathering steam for a harder hit on Earth's magnetic field. So say researchers who have been using data from NASA's twin STEREO spacecraft to unravel the 3D structure of solar storms. Their findings are presented in Nature Communications. "This really surpri ... read more |
|
|
| The content herein, unless otherwise known to be public domain, are Copyright 1995-2010 - SpaceDaily. AFP and UPI Wire Stories are copyright Agence France-Presse and United Press International. ESA Portal Reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement,agreement or approval of any opinions, statements or information provided by SpaceDaily on any Web page published or hosted by SpaceDaily. Privacy Statement |
del.icio.us
Digg
Reddit
YahooMyWeb
Google
Facebook
