Tagged with "SUN"
Norway Aurora
Category: Photo-Blog
Tags: Norway Aurora Sun Activity

CLICK IMAGE TO ENLARGE
Source: http://apod.nasa.gov/apod/ap141103.html

 

Sunspot AR2192 seen with naked eyes
Category: Sun Activity
Tags: Sunspot AR2192

http://spaceweather.com/

GIANT SUNSPOT CRACKLING WITH FLARES: AR2192 is the biggest sunspot in nearly 25 years, and it is still growing. The active region now covers 2750 millionths of the solar disk, an area equivalent to 33 planet Earths skinned and spread out flat. It is so large that sky watchers are seeing it with the naked eye when the sun is dimmed by low-hanging clouds or, in this case, dense fog:

Barry Freas took the picture on October 26th from Red Hill, Kentucky. "It was a very foggy morning," he says. "AR2192 was remarkable."

Big sunspots tend to produce strong flares, and AR2192 is no exception. It is crackling with magnetic activity. In the past three days alone it has unleashed 3 X-class flares and 8 M-flares. The most intense of these flares have caused HF radio blackouts and other communication disturbances on the dayside of Earth.

Usually, strong flares are accompanied by massive CMEs--billion-ton clouds of electrified gas that billow away from the blast site. So far, however, none of the eruptions from AR2192 has produced a major CME. Without a series of CMEs to hit Earth and rattle our planet's magnetic field, there have been no geomagnetic storms nor any widespread auroras.

More eruptions are in the offing. NOAA forecasters estimate an 85% chance of M-class flares and a 55% chance of X-flares during the next 24 hours.  

 

Huge Magnetic 'Ropes' Drive Powerful Sun Explosions Tags: Sun activity Solar Flares Science Space

Huge Magnetic 'Ropes' Drive Powerful Sun Explosions

By Charles Q. Choi, Space.com Contributor   |   October 22, 2014 ShortURL

View of a typical solar eruption using data from NASA's Solar Dynamic Observatory spacecraft. Earth depicted for scale.
Credit: Tahar Amari/Centre de physique théorique, CNRS-Ecole Polytechnique, France

Eruptions on the sun's surface are probably caused by giant, unstable magnetic plasma arches, a new study reports — a discovery that brings scientists one step closer to predicting solar outbursts that can wreak havoc on Earth.

Astronomers have long observed gigantic arches of plasma emerging from the surface of the sun. Known as magnetic flux ropes, coronal loops and solar prominences, these structures possess spiraling magnetic field lines, as if a huge bar magnet had been twisted into a corkscrew. A vast amount of electric current typically runs through the core of each of these tubes.

Scientists have long thought magnetic flux ropes drive powerful solar explosions such as coronal mass ejections (CMEs), which can spawn geomagnetic storms that damage satellites in space and disrupt power grids on Earth. [The Sun's Wrath: Worst Solar Storms in History]

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