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#sunspot

ramnath@nerdpol.ch
ramnath

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#X-CLASS #SOLAR #FLARE: Emerging #sunspot AR3869 erupted this morning (Oct. 24th @ 0357 UTC), producing a slow X3.3-class solar flare. NASA's Solar Dynamics Observatory recorded the hour-long flash:
X-ray Solar #Flares
6-hr max: X3 0357 UT Oct24
24-hr: X3 0357 UT Oct24

Extreme #ultraviolet #radiation from the flare ionized the top of #Earth's atmosphere. This, in turn, caused a shortwave radio blackout over Australia and Southeast Asia. Ham radio operators may have noticed loss of signal at frequencies below 30 MHz for as much as an hour after the flare.

This explosion almost certainly produced a #CME. The US Air Force is reporting a Type II solar radio burst, a natural signal that comes from shockwaves at the leading edge of CMEs. Characteristics of the burst suggest a CME traveling 1.3 million mph.

https://spaceweather.com/

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ramnath@nerdpol.ch
ramnath

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#X-CLASS SOLAR #FLARE: #Sunspot AR3848 was directly facing #Earth this morning, Oct. 8th (0156 UTC), when it unleashed a powerful X1.8-class solar flare. NASA's Solar Dynamics Observatory recorded the extreme #ultraviolet #flash:

This explosions lasted more than 4 hours, so long that it lifted a massive CME out of the #sun's atmosphere. Take a look at these preliminary coronagraph images from NASA's STEREO-A spacecraft. This #CME will certainly hit Earth later this week, potentially sparking a new round of geomagnetic storms.

#X-ray #Solar #Flares
6-hr max: C8 0730 UT Oct09
24-hr: X1 0156 UT Oct09
explanation | more data
Updated: Today at: 1255 UT

https://spaceweather.com/

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ramnath@nerdpol.ch
ramnath

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POSSIBLE EARTH-DIRECTED EXPLOSION: Surprising forecasters, who thought sunspot AR3835 was too stable to explode, #sunspot AR3834 exploded on Sept. 22nd (2139 UTC). The M3.4-class #flare hurled a massive plume of #plasma into space:

Debris from the blast entrained even more plasma on its way out of the sun's atmosphere, forming a partial halo CME. The bulk of the #CME will miss Earth, but its flank will deliver a glancing blow to our planet on Sept. 25th,

https://spaceweather.com/

ramnath@nerdpol.ch
ramnath

#X-ray #SolarFlares
6-hr max: M6 1443 UT Sep12
24-hr: X1 0943 UT Sep12
NEW #SUNSPOT EMITS #X-FLARE: Earth-orbiting satellites detected a strong X1.3-class solar flare today (Sept. 12th @ 0943 UTC). It came from a new and apparently large sunspot emerging over the sun's southeastern limb. The sunspot is not facing Earth now, but it will be early next week,
The number of #sunspots has been increasing at an exponential rate for the past couple of months.

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https://www.zerohedge.com/weather/sun-doing-something-it-not-supposed-do-and-could-mean-big-trouble-months-ahead

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ramnath@nerdpol.ch
ramnath

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ANOTHER EARTH-DIRECTED EXPLOSION: #Sunspot AR3814 has a mixed-polarity magnetic field that makes it a threat for strong flares. This morning, it exploded while directly facing #Earth:

The #ultraviolet #flash (category M1.2) ionized the top of Earth's atmosphere and caused a brief shortwave radio blackout over the Pacific Ocean. Mariners and ham radio operators may have noticed loss of signal at frequencies below 20 MHz between 00:15 and 01:00 UT.

Of greater interest is the #CME. SOHO coronagraphs detected a full halo CME moving directly toward Earth. A NASA model suggests it will reach our planet during the late hours of Sept. 12th. The impact could cause a G2-class geomagnetic storm.
X-ray Solar Flares
6-hr max: M1 1547 UT Sep10
24-hr: M1 1547 UT Sep10
https://spaceweather.com/

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ramnath@nerdpol.ch
ramnath

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#SUNSPOT #SUNSET: The source of all these CMEs is massive sunspot complex AR3764-67. Jan Koeman photographed them at sunset from the beach in Domburg, the #Netherlands:

"As Solar Max comes nearer, the solar disk is peppered with amazing sunspots," says Koeman. "No filter was needed to image these, together with the windmills in the North Sea."

Caution: Even when the sun is hanging low and dimmed by haze and smoke, it is still dangerous. Sunlight magnified by optics can damage your eyes. If you want to photograph the sun without a solar filter, use the camera's LCD screen as a viewfinder. Never look through the optics!

X-ray #SolarFlares
6-hr max: M1 1920 UT Jul30
24-hr: M6 1957 UT Jul29

https://spaceweather.com/

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ramnath@nerdpol.ch
ramnath

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#Sunspot AR3664, the source of the historic May 10th superstorm, has spent the past two week's transiting the farside of the #sun. Yesterday, it announced its return with an #X2.8-class #solarflare. Amateur #astronomer Michael Karrer was watching the sun when the #explosion occured, and he captured this #picture of flying debris:

"I have not seen an explosion like this in my 40 years of observing the sun," says Karrer. "So fast, so far out into space! It was gigantic."

The explosion caused a deep shortwave radio blackout over east Asia and hurled a bright #CME into #space. A NASA model of the CME confirms that it will miss Mercury, Venus and Earth. None of the inner planets will be affected by this powerful event.

https://spaceweather.com/

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ramnath@nerdpol.ch
ramnath

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#X-ray #SolarFlares
6-hr max: #X8 1651 UT May14
STRONGEST #SOLAR #FLARE OF THE CURRENT CYCLE: #Sunspot AR3664 just unleashed the strongest #solarflare of the current solar cycle--an #X8.7-category blast from beyond the sun's western limb. #X marks the spot in this image of the flare from NASA's Solar Dynamics Observatory:

Because the sunspot is behind the edge of the solar disk, the flare was partially eclipsed. It was probably even stronger than it appeared. "X8.7" is almost certainly an underestimate of the flare's true strength.

Extreme ultraviolet radiation from the flare ionized the top of Earth's atmosphere, causing a deep shortwave radio blackout over the Americas. Ham radio operators, aviators and mariners may have noticed a sudden loss of signal at all frequencies below 30 MHz.

Subatomic debris from this event might soon reach Earth, guided toward our planet by the Parker Spiral

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ramnath@nerdpol.ch
ramnath

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#X-FLARE CHAMPION OF SOLAR CYCLE 25: Active sunspot AR3663 produced two more X-flares today, a pair of X1's on May 8th at 0145 UT and 0509 UT. This makes it the most active sunspot of #Solar #Cycle 25 so far.

Since May 3rd, AR3663 has tallied six X-flares, more than any other #sunspot in the past 7 years. It may continue to run up the score as it approaches the sun's western limb later this week.

EARTH-DIRECTED #CME: A CME is coming. It was hurled into space earlier today by a roiling series of explosions in the magnetic canopy of giant sunspot AR3664. This movie from the Solar and Heliospheric Observatory shows the CME leaving the sun bracketed by Venus (right) and Jupiter (left):

A NOAA forecast model predicts the CME will reach Earth late on May 10th, sparking G1- to G2-class geomagnetic storms on May 11th.
#sun
A second CME might be following close behind this one. You can see a hint of it emerging near the end of the movie,
https://spaceweather.com/

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ramnath@nerdpol.ch
ramnath

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MOST ACTIVE #SUNSPOT IN YEARS: Fast-growing sunspot AR3663 has quickly become the most active sunspot of Solar Cycle 25. Today alone it has unleashed two #X-flares and six #M-class #flares. This interest-compressed movie from the #Solar Dynamics Observatory shows 12 hours of crackling action:

Each of these flares has created a brief but deep radio blackout on Earth, causing loss of signal at frequencies below 30 MHz. These are events easily noticed by ham radio operators, aviators and mariners using shortwave to communicate.

The flares are expected to continue. AR3663 has a 'beta-gamma-delta' magnetic field where mixed polarities are bumping together in explosive proximity. NOAA forecasters estimate a 75% chance of additional M-class flares and a 25% chance of more X-flares on May 5th.
https://spaceweather.com/