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Alert message send on Oct 19 1807 UTC: An X1.2 flare took place a few minutes ago (Start: 16:27 , Peak: 16:50 , End: 17:20UTC) in active region Catania #65 - NOAA0484 (position N06E61). This event will affect radio propagation and may be followed by other M flares, and maybe another X-class flare in the next few hours and days. |
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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. |
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Sunspot group 65, labelled by NOAA as active region 484, released unexpectedly an X1 flare on Sunday, October 19 at 16:50 UT. On Goes-data an enhanced flaring activity preceding the X-flare, was seen. This happened after one week of total flaring silence. On the SOHO/Lasco movie an associated CME was visible, but did not appear Earth directed. The sunspot group has grown very fast: it doubled in area overnight and has now an beta-gamma-delta configuration. the beta-gamma labeling indicates a sunspot group that is bipolar but in which no continuous line can be drawn separating spots of opposite polarities, while delta denotes a complex magnetic configuration as opposite polarity sunspots chaire a penumbra. |
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