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ramnath@nerdpol.ch
ramnath

Big #sunspot AR3590 is as dangerous as it looks. Late yesterday (Feb. 21 @ 2307 UT), the active region produced a powerful X1.8-class #solarflare with a shortwave radio blackout over the western USA and Pacific Ocean. NASA's Solar Dynamics Observatory recorded the extreme #ultraviolet #flash:

enter image description here

The explosion did not produce a CME, at least not a bright one. NOAA analysts are still inspecting SOHO coronagraph data for signs of a storm cloud. If they find one, it will be reported here.

This could be the first of many flares from AR3590. The sunspot has an unstable 'beta-gamma-delta' magnetic field that harbors energy for multiple #X-class #explosions

https://spaceweather.com/

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ramnath@nerdpol.ch
ramnath

enter image description here

#X-CLASS #SOLAR #FLARE AND #CME: New #sunspot AR3341 erupted on June 20th, producing an X1.1-class solar flare (1709 UT). NASA's Solar Dynamics Observatory captured the extreme ultraviolet flash:

#Radiation from the flare ionized the top of #Earth's #atmosphere. This caused a deep shortwave radio blackout over North America: map. Aviators and ham radio operators may have noticed loss of signal at frequencies below 30 MHz for as much as 20 minutes after the flare.

SOHO coronagraphs have since detected a CME. It is the fan-shaped cloud expanding away from the sun's southeastern limb (8 o'clock position):
enter image description here

The CME's expansion velocity exceeds 1000 km/s (2.2 million mph), according to Type II radio bursts detected by the US Air Force. It's a fast mover that should deliver a potent blow to whatever it hits.

Earth is probably not in the strike zone, although a glancing blow may be possible on June 22nd or 23rd.
https://spaceweather.com/

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ramnath@nerdpol.ch
ramnath

#X-CLASS #SOLAR-FLARE: The sun produced another #X-flare on Jan. 10th, this time from new sunspot AR3186. This movie from NASA's Solar Dynamics Observatory shows the X1-class explosion hurling a plume of debris into space:
enter image description here

Radiation from the flare ionized the top of Earth's atmosphere, causing a shortwave radio blackout over the South Pacific: blackout map. Mariners and ham radio operators may have noticed fadeouts and other unusual propagation effects at frequencies below ~30 MHz.

This is the 3rd X-flare in a week, and each flare has come from a different #sun spot. It's not just a single active region; the whole sun is becoming more active. NOAA forecasters say there is a 30% chance of another X-flare on Jan. 11th.

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