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Astronomy News

Watch for Aurora

There is a possibility of seeing aurora for the next couple of nights. The sky is supposed to be clear, too.  –CPL

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Space Weather News for Feb. 26, 2019
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GEOMAGNETIC STORMS THIS WEEK: A large hole in the sun’s atmosphere is facing Earth and sending a stream of solar wind in our direction. Minor G1-class geomagnetic storms are likely when the gaseous material arrives on Feb. 27th and 28th. Solar wind speeds could top 500 km/s (1.1 million mph), sparking auroras around the Arctic Circle and possibly even in US states along a line from Maine to Washington. Visit Spaceweather.com for updates.

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Above: NASA’s Solar Dynamics Observatory obtained this false-color ultraviolet image of the hole in the sun’s atmosphere on Feb. 25, 2019.

Astronomy News

LARGE HOLE IN SUN’S ATMOSPHERE: possible aurora

Space Weather News for July 22, 2018
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A LARGE HOLE IN THE SUN’S ATMOSPHERE: A large hole has opened in the sun’s atmosphere and it is spewing a stream of solar wind toward Earth. NOAA forecasters estimate a 65% chance of minor geomagnetic storms when the gaseous material arrives on July 24th. Such holes are primary sources of solar activity during solar minimum, both forming and staying open longer when sunspots are absent. Learn more on today’s edition of Spaceweather.com

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Above: A large coronal hole faces Earth on July 21st. Image credit: NASA’s Solar Dynamics Observatory

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Astronomy News

A GASH IN THE SUN’S ATMOSPHERE:

If you live where it is not snowing, you may want to watch for possible aurora.  –CPL

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Space Weather News for March 13, 2018
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A GASH IN THE SUN’S ATMOSPHERE: An unusually wide hole has opened in the sun’s atmosphere, and it is spewing a fan-shaped stream of solar wind toward Earth. NOAA forecasters say there is a 55% chance of minor G1-class geomagnetic storms when the solar wind arrives, probably during the late hours of March 14th. Visit Spaceweather.com for more information and updates.

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Above: This image from NASA’s Solar Dynamics Observatory (SDO) shows the gash where solar wind is emerging on March 13th. The false brown color of the sun corresponds to the 193 ångström wavelength of SDO’s extreme ultraviolet telescope.

Astronomy News

BIG SUNSPOT ERUPTS

From http://spaceweather.com/

After several days of pent-up quiet, big sunspot AR2473 erupted on Dec. 28th (12:49 UT), producing a slow but powerful M1.9-class solar flare. NASA’s Solar Dynamics Observatory recorded the blast’s extreme ultraviolet glow:

Sun
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For more than an hour, UV radiation from the flare bathed the top of Earth’s atmosphere, ionizing atoms and molecules. This, in turn, disrupted the normal propagation of shortwave radio signals on the dayside of our planet. A NOAA blackout map shows the affected area. Ham radio operators, mariners and aviators in South America, Africa and the south Atlantic Ocean may have noticed fades and blackouts of transmissions below 20 MHz.

The slow explosion also produced a coronal mass ejection (CME). Images from the Solar and Heliospheric Obseratory (SOHO) show a ragged, full-halo CME heading almost directly toward Earth.

The storm cloud will likely reach our planet on Dec. 31st, possibly triggering the first geomagnetic storm of the New Year. NOAA analysts are modelling this CME now; stay tuned for refined forecasts later today when they release their storm track.

Sunspot AR2374 has an unstable ‘beta-gamma’ magnetic field that could explode again in the hours ahead. NOAA forecasters estimate a 55% chance of additional M-class flares and a 10% chance of X-flares on Dec. 28th.