Electromagnetic radiation from yesterday's X2-class solar flare had a significant effect on Earth's upper atmosphere.

 Space Weather.com

by Dr. Tony Phillips.

X2-FLARE BLASTS EARTH'S IONOSPHERE:

As a wave of ionization swept across the dayside of the planet, the normal propagation of shortwave radio signals was scrambled. In Alachua, Florida, electrical engineer Wes Greenman recorded the effects using his own shortwave radio telescope. Click on the frequency-time plot to view an animation:
.....
Screen Captures from X2-FLARE BLASTS EARTH'S IONOSPHERE  Space Weather . com

.....

.....

,....

.....

During the time that terrestrial shortwave transmissions were blacked out, the sun filled in the gap with a loud radio burst of its own. In New Mexico, amateur radio astronomer Thomas Ashcraft recorded the sounds. "This radio burst was a strong one and might be too intense for headphones," cautions Ashcraft.

Solar radio bursts are caused by strong shock waves moving through the sun's atmosphere. (Electrons accelerated by the shock front excite plasma instabilities which, in turn, produce shortwave static.) They are usually a sign that a CME is emerging from the blast site--and indeed this flare produced a very bright CME.

Read More Here
.....

Twin X-Class Solar Flares October 25, 2013

SolarWatcher

Published on Oct 25, 2013

TWIN X-CLASS SOLAR FLARES
Two major X-Class solar flares peaking to X1.7 and X2.3 were both registered from newly numbered Sunspot 1882 at 08:01 UTC this morning and15:03 UTC this afternoon . Associated with this major event was a 10cm Radio Burst (TenFlare) lasting 24 minutes and measuring 610 solar flux units and 44 minutes measuring 370 solar flux units. Two large coronal mass ejections (CME) are now visible in the latest LASCO imagery and looks to have a possible Earth directed components and we should begin to see a series of strong geomagnetic disturbances over the next 2-3 days.
.....

Space Weather . com

Dr. Tony Phillips.

INTERCONNECTED SOLAR ACTIVITY:

The X1-flare of Oct. 25th was remarkable not only for its strength, but also for its interconnectedness. The flare was bracketed by two erupting magnetic filaments, each located hundreds of thousands of kilometers from the instigating sunspot AR1882. The whole episoide, shown in this SDO movie, was reminiscent of the famous global eruption of August 2010.

Today, Oct. 26th, it happened again. Click on this image of the sun's southwestern quadrant and watch a sequence of flare activity around sunspots AR1875 and AR1877 followed by a filament eruption off the SW limb:

Instead of being a sequence of unrelated events, these flares and eruptions are likely connected by magnetic fields, which thread through the whole broad region. Like dominoes falling, one explosion triggers another as shock waves follow magnetic fields from blast site to blast site.

The filament punctuated the sequence by hurling a part of itself into space. SOHO has observed a CME emerging from the blast site, but it is too soon to say whether it is heading for Earth. Stay tuned for updates.

Read More Here
.....

Related articles

• NOAA Forecasts 70 Percent Chance of M-Class Solar Flares
• Second Major Flare in 8 hours - X-2 Flare Blasts Earth's Ionosphere
• Solar Tsunami and Radio Burst
• Sun Erupts With Major Solar Flare (Video)