http://spaceweather.com/ - Nov 21, 2014 2:15:08 PM - Dec 1, 2004 12:53:58 AM
392.5 3.3 Updated: Today at 1755 UT 1354 UT Nov21 Updated: Today at: 1700 UT7.1 3.3 Updated: Today at 1757 UT
SUB-SUNDOG: Next week's Thanksgiving is the biggest travel holiday of the year in the United States. Millions of people board airplanes and fly long hours to visit friends and family. Dreading the trip? Think of it as a sky watching opportunity. There are some things you can see only through the window of an airplane--like this:
"In the tops of the clouds, I saw a bright reflection of the sun flanked by rainbow-colored sundogs," says Alex Ruege, who snapped the picture on November 14th while he was flying over Phoenix, Arizona.
Atmospheric optics expert Les Cowley explains the apparition: "Look down from the sunny side of an aircraft and you will often see a dazzling reflection of the sun in the clouds. This is a subsun, formed by millions of plate shaped ice crystals acting as mirrors. Sometimes the subsun is flanked by two colorful sub-sundogs. How do they form? Sunlight nearly always bounces up and down inside the thin ice plates before it can emerge. An even number of bounces make a sundog. An odd number makes the sub-sundog. When you see halos always check out the opposite direction – you might see even rarer sights!"
382.6 5.5 Updated: Today at 0936 UT C1 0445 UT Nov21 C1 0445 UT Nov21 Updated: Today at: 0900 UT Daily Sun: 21 Nov 14 Bearclaw sunspot AR2209 poses a threat for X-class solar flares. Credit: SDO/HMIUpdated 21 Nov 2014 Update 21 Nov Updated 21 Nov 2014
GROUND CURRENTS IN NORWAY: A weak CME expected to hit Earth's magnetic field on Nov. 20th did not reveal itself as an obvious disturbance in the speed of the solar wind. Nevertheless, it might have been there. A surge in ground currents in northern Norway suggests a stealthy CME impact might have occured, after all.
RED SPRITES OVER THE ADRIATIC: Summer is the season for sprites, a form of lightning that leaps up from the tops of thunderstorms. This picture, just in from Dubrovnik, a Croatian city on the Adriatic Sea, shows that they can be seen in autumn, too:
"I was photographing a distant thunderstorm when this red sprite appeared," says Boris Basic of Dubrovnik. "It is a rare upper atmospheric phenomenon."
Inhabiting the upper reaches of Earth's atmosphere alongside noctilucent clouds, meteors, and some auroras, sprites are a true space weather phenomenon. Some researchers believe they are linked to cosmic rays: subatomic particles from deep space striking the top of Earth's atmosphere produce secondary electrons that, in turn, could provide the spark that triggers sprites.
Although sprites have been seen for at least a century, most scientists did not believe they existed until after 1989 when sprites were photographed by cameras onboard the space shuttle. Now "sprite chasers" regularly photograph the upward bolts from their own homes. Give it a try!
Magnetic fields criss-crossing the toes and pad of this Ursidamorphic structure harbor energy for M- and X-class solar flares. However, the sunspot has been quiet for more than three days, so NOAA forecasters are estimating a relatively low 10% chance of on Nov. 21st.
400.7 5.6 Updated: Today at 0517 UT Sunspot number: 83unsettled Kp= 4 unsettled7.4 5.4 north Updated: Today at 0517 UT
372.9 5.9 Updated: Today at 0117 UT Updated: Today at: 2359 UT2 Kp= 3 quiet7.6 4 south Updated: Today at 0117 UT Updated at: 2014 Nov 20 2200 UTC
Updated at: 2014 Nov 20 2200 UTC
25 % 10 %
Friday, Nov. 21, 2014
384.6 6.4 Updated: Today at 2106 UT C2 1956 UT Nov20 Updated: Today at: 2100 UT3 6.5 north Updated: Today at 2106 UT Updated at: 11-20-2014 10:55:02
CME IMPACT EXPECTED: A CME so weak that it barely stands out from the ambient solar wind is expected to hit Earth's magnetic field today. Mindful that even weak CMEs can be potent, NOAA forecasters put the odds of a polar geomagnetic storm at 40%. Arctic sky watchers should be alert for auroras on Nov. 20-21.
This is old sunspot AR2192, now making its second pass across the face of the sun. "I created this high resolution picture by combining six images," says Tosi. Click to view the
LEONID FIREBALLS: This week, Earth passed through a stream of debris from Comet 55P/Tempel-Tuttle, source of the annual Leonid meteor shower. Forecasters expected the display to be meagre, in part because it has been 15 years since the comet visited the inner solar system. Contrary to expectations, however, the Leonids of 2014 have produced a pleasing number of fireballs.Bill Cooke, who runs NASA's all-sky network of meteor cameras reports: "We have 67 confirmed Leonids so far, despite a couple of days of bad weather." Cooke has plotted the orbit of each fireball to create this summary:
The blue curves show the orbits of all the Leonid fireballs that disintegrated above the USA in view of network cameras between Nov. 15th and 20th. Those curves are a good match to the orbit of Comet Tempel-Tuttle, color-coded purple. "That's how we know they are Leonids," explains Cooke.
Last night alone, the network picked up 15 more fireballs, which means the shower might not yet be finished. Readers who wake up before sunrise, and who are not blanketed by snow clouds, should remain alert for bright meteors. ( And if you do have snow clouds, listen for Leonid echoes on Spaceweather.com's live meteor radar, which operates even during winter storms.)
408.3 Updated: Today at 0847 UT C7 0641 UT Nov20 C7 0641 UT Nov20 Updated: Today at: 0800 UT Daily Sun: 20 Nov 14 A new and possibly large sunspot is emerging at the circled location. Credit: SDO/HMIUpdated 20 Nov 2014 Update 20 Nov 170 Updated 20 Nov 2014
CME IMPACT EXPECTED: A CME so weak that it barely stands out from the ambient solar wind is expected to hit Earth's magnetic field today. Mindful that even weak CMEs can be potent, NOAA forecasters put the odds of a polar geomagnetic storm at 40%. Arctic sky watchers should be alert for auroras on Nov. 20-21. Aurora alerts:
BEAR CLAW SUNSPOT: Imagine a bear claw with toes the size of Earth. Yesterday, Philippe Tosi of Nîmes, France, looked through the eyepiece of his solar telescope and saw exactly that:
It's old sunspot AR2192, now making its second pass across the face of the sun. "I created this high resolution picture by combining six images," says Tosi. Click to view the full panorama.
Magnetic fields criss-crossing the toes and pad of this Ursidamorphic structure harbor energy for M- and X-class solar flares. However, the sunspot has been quiet for almost three days, so NOAA forecasters are estimating a relatively low 5% chance of X-flares on Nov. 20th.