Largest Sunspot in Years Observed on the Sun
By Clara Moskowitz – “One of the largest sunspots in years has appeared on the sun, darkening part of its glowing face.
The massive sunspot, called AR1339, is about 50,000 miles long, and 25,000 miles wide, reports SpaceWeather.com. For comparison, Earth itself is only 8,000 miles wide.
The sunspot behemoth isn’t yet facing our planet, but was spotted Thursday, Nov. 3, by NASA’s Solar Dynamics Observatory (SDO) satellite. The spacecraft’s photos of the giant sunspot show the solar region as it comes into view on the northeastern edge, or limb, of the sun.
When it does turn our way in the days ahead, it should be an ‘easy target for backyard solar telescopes,’ according to SpaceWeather.com.
The sunspot is actually a group of nearby darkened spots on the sun, some of which are individually wider than planet Earth.
Sunspots appear when intense magnetic activity ramps up on the sun, blocking the flow of heat through the process of convection, which causes areas of the sun’s surface to cool down. These isolated areas then appear dimmer than the surrounding area, creating a dark spot.
The intense magnetic activity around sunspots can often cause solar flares, which are large releases of energy that can actually brighten up the sun. Flares are also accompanied by flows of charged particles out into space, called coronal mass ejections, which can wreak havoc on satellites and power grids on Earth if they head our way.
SpaceWeather.com warns that a huge sunspot like AR1339 comes with a large potential for solar flares. The National Oceanic and Atmospheric Administration (NOAA) forecasts a 50 percent chance of medium-class M solar flares over the next 24 hours due to this sunspot.” Read more.
NASA detects X 2-class flare eruption on the Sun – “Earth-orbiting satellites have just detected an X2-class solar flare. The source is huge sunspot AR1339. If a CME occurred, chances are it is not earth-directed given the far eastern eruption site on the solar disk NOAA said. This turbulent region of the Sun will be facing Earth directly in about 5 days. A solar flare is a sudden brightening observed over the Sun surface or the solar limb, which is interpreted as a large energy release of up to 6 × 1025 joules of energy (about a sixth of the total energy output of the Sun each second). The flare ejects clouds of electrons, ions, and atoms through the corona into space. These clouds typically reach Earth a day or two after the event. The term is also used to refer to similar phenomena in other stars, where the term stellar flare applies.” Source.




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