As the Sun Turns: Solar Minimums and Maximums

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Maria
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Re: As the Sun Turns: Solar Minimums and Maximums

Postby Maria » Sun 12 May 2019 8:44 am

With the May 10 to 11 CME, the earth was bathed with rare blue auroras:

From http://www.spaceweather.com for May 12, 2019:

RARE BLUE AURORAS OVER CANADA: Northern Lights are usually green, sometimes red. Those are the colors we see when oxygen is hit by electrons raining down from space during a geomagnetic storm. On Friday night, however, Harlan Thomas of Calgary, Alberta, witnessed a different color: deep-blue.


Image

"To see these incredible blue pillars was out of this world," says Thomas.

In auroras, blue is a sign of nitrogen. Energetic particles striking ionized molecular nitrogen (N2+) at very high altitudes can produce a blue glow rarely seen during auroral displays. In this case, it was the afterglow of a CME impact.

The CME left the sun on May 6th, propelled in our direction by an explosion in the magnetic canopy of sunspot AR2740. When it finally arrived on May 10th, the slow-moving storm cloud rattled Earth's magnetic field, triggering a minor G1-class geomagnetic storm. Auroras were sighted in parts of Canada as well as US States such as Michigan and Minnesota.


Here is a photo from Big Bay, Michigan, taken by S. Evans on May 10, 2019.
Image
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Maria
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Re: As the Sun Turns: Solar Minimums and Maximums

Postby Maria » Tue 14 May 2019 5:29 am

AR2741 is still actively exploding. There was a bridge which formed across the active region. This bridge can lead to explosions.

AR2740 is now in decay.

Below are some updates from www.spaceweather.com

RARE BLUE AURORAS OVER CANADA: Auroras are usually green. Not this weekend, however. On May 10th a CME hit Earth's magnetic field, sparking a display of deep-blue auroras over Canada. Read the full story to learn the special ingredient that turns auroras blue. Aurora Alerts: SMS Text.

MULTIPLE CMEs ARE COMING: Three and possibly four CMEs are en route to Earth following a series of explosions near sunspot AR2741. The most potent so far occurred on May 12th when a filament of magnetism surrounding the sunspot became unstable and erupted. The blast zone was more than 220,000 km in diameter:

Image

Similar eruptions on May 10th, 11th and 13th combined with this one to produce a train of faint coronal mass ejections (CMEs) heading in our direction. The incoming CMEs are lightweights compared to the bright massive CMEs typically seen during Solar Maximum. However, their combined effect could rattle Earth's magnetic field.

NOAA forecasters estimate a 55% to 60% chance of minor G1-class geomagnetic storms on May 15th and 16th. Isolated periods of stronger G2-class storms are possible as well.
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Maria
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Re: As the Sun Turns: Solar Minimums and Maximums

Postby Maria » Thu 16 May 2019 1:58 am

Yesterday, today, and tomorrow we have had multiple CME's hitting the earth from AR2740, which is now decaying and revolving around the back side of the sun, and AR2741.

Here is the data from NOAA showing that AR2741 has become very active as it approaches the sun's Western limb, where any CME emitted becomes geodirective.

:Date: 2019 05 15
# Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center
# Please send comments and suggestions to SWPC.Webmaster@noaa.gov
#
# Missing data: ////
# Updated every 5 minutes.
# Edited Events for 2019 May 15
#
#Event Begin Max End Obs Q Type Loc/Frq Particulars Reg#
#-------------------------------------------------------------------------------

4130 + 0832 0840 0849 G15 5 XRA 1-8A B3.5 2.6E-04 2741

4140 1642 1656 1703 G14 5 XRA 1-8A B2.0 2.0E-04 2741
4140 1644 1645 1654 HOL 3 FLA N05W34 SF ERU 2741

4150 + 1915 1924 1927 G15 5 XRA 1-8A C2.0 5.5E-04 2741
4150 1918 1923 1939 HOL 3 FLA N08W36 SN ERU 2741

4160 + 1947 1956 2002 G15 5 XRA 1-8A B2.3 1.6E-04 2741


ftp://ftp.swpc.noaa.gov/pub/indices/eve ... terday.txt
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Re: As the Sun Turns: Solar Minimums and Maximums

Postby Barbara » Thu 16 May 2019 3:43 am

Enjoying the pics of the seldom viewed blue auroras.


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