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Major Solar Flare Alert
Major Solar Flare Alert
22 Jul 2004
(Source: Solar Terrestrial Dispatch)

Issued: 06:50 UTC, 22 July 2004 Solar Terrestrial Dispatch


A major solar flare erupted from Region 10652 at 00:32 UTC on 22 July. The event reached an x-ray class M9.1. There were no Type II sweep frequency events reported, although it is possible the signature may have been obscured by broadband radio noise prior to and during the event.

A coronal mass ejection has been detected in LASCO C3 imagery, although the mass appears to be dominantly (perhaps entirely) directed south of the ecliptic. Without more compelling evidence, we are inclined to believe that this event probably will not be geoeffective.

Region 10652 continues to evolve. It is now over 2010 millionths in size and is continuing to grow. The magnetic structure of this region remains a beta-gamma-delta. Negative polarity magnetic flux has been emerging and impinging on an area of positive flux in the south-central region of the spot complex. This was the location of todays major solar flare. Another area of concern is in the north-central area, where magnetic shear has been increasing over the last 24 hours. Within the last few hours, new opposite polarity flux has begun emerging near the head of the leader spot. Should development there persist (which is unlikely), additional instability may be introduced.

Additional major solar flares are expected from this spot complex over the coming days. Ensuing associated coronal mass ejection activity could prove to be geoeffective.

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Last Updated: 22 Jul 2004