2 X-bursts from Sunspot Group 70

This time it is not sunspot group 65, but sunspot group 70 (NOAA 0486) that is making the trouble. This group rotated over the eastlimb on Oct 23.

The 'green' sun is an image taken by EIT on SOHO. The active region which produced the X-flare is enlighted because it is emitting strongly in 195 Å.

Alert message send on Oct 23 0856 UTC:

At present a large X-flare is going on. It has reached its maximum value X5.4 in GOES 12 X-ray data at 08:35 UT.

Alert message send on Oct 23 0856 UTC:

Another X1.1 flare just happened near the East limb. It is again located in the NOAA 0464 (Catania 70) sunspot group (S17E88, EIT derived location). It started at 19:50, peaked at 20:04 and stopped at 20:14 UT.

We see an MDI/SOHO image showing the magnetic fieldstrengths: black and white spots denote areas of intense (opposite) magnetic flux. The spot on the left rotated only shortly on the solar disk and showed already some fireworks! You can click on the picture to enlarge it.

The proton flux is slightly enhanced. But, the protons with energy larger than 10 MeV did not reach the threshold yet. This graph is made with data measured by Goes.

Click on the figures for a larger version.

Scientists classify solar flares according to their x-ray brightness in the wavelength range 1 to 8 Angstroms. We have the A, B, C, M and X level. X-class flares are big; they are major events that can trigger planet-wide radio blackouts and long-lasting radiation storms. These measurements are made by Goes, a geostationary satellite.