Publicado em 31/07/2012
Dilma terrorista e assassina
domingo, 2 de novembro de 2014
Tracking a Monster Sunspot Across the Sun
Publicado em 01/11/2014
Tracking a Giant Sunspot Across the Sun.
Super sunspot AR2192 produced 10 significant solar flare while traversing the Earth-side of the sun; six X-class and four above M5-class.
An active region on the sun – an area of intense and complex magnetic fields – rotated into view on Oct. 18, 2014. Labeled AR 12192, it soon grew into the largest such region in 24 years, and fired off 10 sizable solar flares as it traversed across the face of the sun. The region was so large it could be seen without a telescope for those looking at the sun with eclipse glasses, as many did during a partial eclipse of the sun on Oct. 23.
"Despite all the flares, this region did not produce any significant coronal mass ejections," said Alex Young a solar scientist at NASA's Goddard Space Flight Center in Greenbelt, Maryland. Coronal mass ejections, or CMEs, are giant clouds of solar particles that can affect technology when they reach near-Earth space. "You certainly can have flares without CMEs and vice versa, but most big flares do have CMEs. So we're learning that a big active region doesn't always equal the biggest events."
Such active regions are measured in millionths of a solar hemisphere, where 1 micro-hemisphere, or MH, is about 600,000 square miles. This region topped out at 2,750 MH, making it the 33rd largest region out of approximately 32,000 active regions that have been tracked and measured since 1874. It is the largest sunspot seen since AR 6368, which measured 3,080 MH on Nov. 18, 1990.
The largest five active regions ever observed were between 4,000 and more than 6,000 MH and they all appeared between 1946 and 1951.
On the other hand, the region that produced one of the biggest solar flares of all time on Sep. 1, 1859 – in what's known as the Carrington event – wasn't even one of the top 50 at only 2,300 MH.
During its trip across the front of the sun, AR 12192 produced six X-class flares, which are the largest flares, and four strong M-class flares. M-class flares are one tenth as strong as X-class flares. The number provides more information about its strength. An M2 is twice as intense as an M1, an M3 is three times as intense, etc.
"Having so many similar flares from the same active region will be a nice case study for people who work on predicting solar flares," said Dean Pesnell, project scientist for NASA's Solar Dynamics Observatory at Goddard. "This is important for one day improving the nation's ability to forecast space weather and protect technology and astronauts in space."
The dates and peak times in EDT of the large solar flares from AR 12192 are as follows:
Oct. 19, 1:01 am: X1.1
Oct. 21, 9:59 pm: M8.7
Oct. 22, 10:28 am: X1.6
Oct. 24, 5:41 pm: X3.1
Oct. 25, 1:08 pm: X1.0
Oct. 26, 6:56 am: X2.0
Oct. 26, 8:34 pm: M7.1
Oct. 27, 6:09 am: M6.7
Oct. 27, 10:47 am: X2.0
Oct. 28, 11:32 pm: M6.6
AR 12192 rotated onto the far side of the sun on Oct. 30, 2014, however as it evolves, we may see a new version of it rotating back into view in two weeks.
Related Links:
For more on this gigantic sunspot and its flares:
http://www.nasa.gov/content/goddard/s...
http://www.nasa.gov/content/goddard/s...
http://www.nasa.gov/content/goddard/o...
http://www.nasa.gov/content/goddard/o...
http://www.nasa.gov/content/goddard/s...
Credit: W1TV
Super sunspot AR2192 produced 10 significant solar flare while traversing the Earth-side of the sun; six X-class and four above M5-class.
An active region on the sun – an area of intense and complex magnetic fields – rotated into view on Oct. 18, 2014. Labeled AR 12192, it soon grew into the largest such region in 24 years, and fired off 10 sizable solar flares as it traversed across the face of the sun. The region was so large it could be seen without a telescope for those looking at the sun with eclipse glasses, as many did during a partial eclipse of the sun on Oct. 23.
"Despite all the flares, this region did not produce any significant coronal mass ejections," said Alex Young a solar scientist at NASA's Goddard Space Flight Center in Greenbelt, Maryland. Coronal mass ejections, or CMEs, are giant clouds of solar particles that can affect technology when they reach near-Earth space. "You certainly can have flares without CMEs and vice versa, but most big flares do have CMEs. So we're learning that a big active region doesn't always equal the biggest events."
Such active regions are measured in millionths of a solar hemisphere, where 1 micro-hemisphere, or MH, is about 600,000 square miles. This region topped out at 2,750 MH, making it the 33rd largest region out of approximately 32,000 active regions that have been tracked and measured since 1874. It is the largest sunspot seen since AR 6368, which measured 3,080 MH on Nov. 18, 1990.
The largest five active regions ever observed were between 4,000 and more than 6,000 MH and they all appeared between 1946 and 1951.
On the other hand, the region that produced one of the biggest solar flares of all time on Sep. 1, 1859 – in what's known as the Carrington event – wasn't even one of the top 50 at only 2,300 MH.
During its trip across the front of the sun, AR 12192 produced six X-class flares, which are the largest flares, and four strong M-class flares. M-class flares are one tenth as strong as X-class flares. The number provides more information about its strength. An M2 is twice as intense as an M1, an M3 is three times as intense, etc.
"Having so many similar flares from the same active region will be a nice case study for people who work on predicting solar flares," said Dean Pesnell, project scientist for NASA's Solar Dynamics Observatory at Goddard. "This is important for one day improving the nation's ability to forecast space weather and protect technology and astronauts in space."
The dates and peak times in EDT of the large solar flares from AR 12192 are as follows:
Oct. 19, 1:01 am: X1.1
Oct. 21, 9:59 pm: M8.7
Oct. 22, 10:28 am: X1.6
Oct. 24, 5:41 pm: X3.1
Oct. 25, 1:08 pm: X1.0
Oct. 26, 6:56 am: X2.0
Oct. 26, 8:34 pm: M7.1
Oct. 27, 6:09 am: M6.7
Oct. 27, 10:47 am: X2.0
Oct. 28, 11:32 pm: M6.6
AR 12192 rotated onto the far side of the sun on Oct. 30, 2014, however as it evolves, we may see a new version of it rotating back into view in two weeks.
Related Links:
For more on this gigantic sunspot and its flares:
http://www.nasa.gov/content/goddard/s...
http://www.nasa.gov/content/goddard/s...
http://www.nasa.gov/content/goddard/o...
http://www.nasa.gov/content/goddard/o...
http://www.nasa.gov/content/goddard/s...
Credit: W1TV
Tonight's Sky in November 2104 on Hubble Space Telescope #Hubble
Publicado em 31/10/2014
Backyard stargazers get a monthly guide to the northern hemisphere's skywatching events with "Tonight's Sky." November boasts the annual Leonid meteor shower.
Credit: Hubble Space Telescope
Credit: Hubble Space Telescope
Birmânia abre portas ao mundo
Publicado em 31/10/2014
A opositora birmanesa Aung San Suu Kyi participa sexta-feira numa cimeira inédita, a convite do presidente birmanês Thein Sein, isto a um ano das legislativas seguidas de perto por Washington. A Prémio Nobel da Paz e o presidente entraram juntos na sala de reunião, sem prestar declarações à forte presença da imprensa internacional enviada a Naypyidaw, a capital da Birmânia.VIDEOGRAFIA
Crédito: AFP
Crédito: AFP
Desastre da nave SpaceShipTwo marca revés para Virgin Galactic de Richard Branson
Publicado em 31/10/2014
A queda da nave espacial SpaceShipTwo, da empresa Virgin Galactic, nesta sexta-feira nos Estados Unidos representa um revés para o sonho do magnata britânico Richard Branson de oferecer os primeiros voos comerciais ao espaço. Segundo especialistas, o acidente pode atrasar o início da era do turismo espacial.
Crédito: AFP
Crédito: AFP
Drones sobrevoam usinas nucleares da França
Publicado em 31/10/2014
Autoridades francesas disseram nesta sexta-feira que detectaram drones, aeronaves não tripuladas, sobre duas usinas nucleares.
Crédito: AFP
Crédito: AFP
Itália termina operação para salvar imigrantes no Mediterrâneo
Publicado em 31/10/2014
O ministro do Interior italiano, Angelino Alfano, confirmou nesta sexta-feira o fim da operação "Mare Nostrum", que em um ano salvou cerca de 150 mil imigrantes que tentavam cruzar o Mediterrâneo.
Crédito: AFP
Crédito: AFP
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