Tag Archives: solar activity

Coronal Hole

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CORONAL HOLE: Spewing solar wind, a yawning dark fissure in the sun’s atmosphere is turning toward Earth. NASA’s Solar Dynamics Observatory photographed the “coronal hole” during the early hours of June 1st:

Coronal holes are places where the sun’s magnetic field opens up and allows the solar wind to escape. A stream of solar wind flowing from this coronal hole will reach Earth on June 5th – 7th, possibly stirring geomagnetic storms. High-latitude sky watchers should be alert for auroras

from:    space weather.com

New CME

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INCOMING CME? A coronal mass ejection (CME) that flew off the sun’s western limb on May 17th might hit Earth after all. NOAA forecasters say a shock wave from the blast could deliver a glancing blow to Earth’s magnetic field on May 18th or 19th. The CME, pictured below, was propelled by an M5-class solar flare from departing sunspot AR1476.

The speckles in the movie are caused by energetic protons hitting the observatory’s detector. Those protons may have been accelerated in part by the shock wave en route to Earth.

According to NOAA, there is a 40% chance of minor geomagnetic storms and a 15% chance of strong storms when the shock arrives. High-latitude sky watchers should be alert for auroras.

fr/spaceweather.com

Solar Maximum 2013

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PUBLIC SERVICE ANNOUNCEMENT: Solar maximum is coming in 2013. How will space weather affect you? To answer that question, experts from around the world are gathering for the Space Weather Enterprise Forum (SWEF) on June 5, 2012, at the National Press Club in Washington, DC. To learn more and register, please visit the SWEF web site athttp://www.nswp.gov/swef/swef_2012.html.

fr/spaceweather.com

May 14 CME

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INCOMING CME (UPDATED): On May 11th at 23:54 UT, a coronal mass ejection raced away from the sun faster than 1000 km/s. The fast-moving cloud will deliver a glancing blow to Earth’s magnetic field on May 14th around 14:30 UT, according to a revised forecast track prepared by analysts at the Goddard Space Weather Lab. Mars is also in the line of fire

fr/spaceweather.com

Very Large Sunspot Coming Our Way

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BIG SUNSPOT: One of the largest sunspot groups in years rotated over the sun’s northeastern limb on May 6th. With a least four dark cores larger than Earth, AR1476 sprawls more than 100,000 km from end to end, and makes an easy target for backyard solar telescopes. Amateur astronomer Alan Friedman sends this picture of the behemoth from his backyard in Buffalo, NY:

“AR1476 is firecrackler,” says Friedman.

Indeed, the active region is crackling with impulsive M-class solar flares. Based on the sunspot’s complex ‘beta-gamma’ magnetic field, NOAA forecasters estimate a 75% chance of more M-flares during the next 24 hours. There is also a 10% chance of powerful X-flares.

“This one is going to be fun as it turns to face us!” predicts Friedman. He might be right

from: Spaceweather.com

Coronal Hole Ejections

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CORONAL HOLE: A dark hole in the sun’s atmosphere (a ‘coronal hole’) is spewing a stream of solar wind toward Earth. The impact of the stream, expected on May 9-11, could add to the effect of the incoming CMEs, boosting the chances of strong geomagnetic activity later this week. NASA’s Solar Dynamics Observatory took this picture of the opening on May 8th:

Coronal holes are places where the sun’s global magnetic field opens up and allows some of the sun’s atmosphere to escape. The outflow of gas is the solar wind. NOAA forecasters estimate a 40% chance of geomagnetic activity on May 9-10 when the stream arrives (along with the CMEs of May 7th).

from:    spaceweather.com

New CME’s Incoming

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TWO INCOMING CMEs: A pair of solar eruptions on May 7th hurled coronal masss ejections (CMEs) toward Earth. Forecast tracks prepared by analysts at the Goddard Space Weather Lab suggests that clouds with arrive in succession on May 9th at 13:40 UT and May 10th at 07:54 UT (+/- 7 hours). The double impact could spark moderate geomagnetic storms. High-latitude sky watchers should be alert for auroras.

from; spaceweather.com