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Large Sunspot Appears
Large Sunspot Appears
20 Jul 2004

Space Weather News for July 19, 2004

The sunspot number soared this weekend when new sunspot 652 emerged over the sun's eastern limb. This active region is big, about the size of the planet Jupiter, and easily seen from Earth. Warning: Don't look directly at the sun; doing that could blind you. Instead, try the safe solar observing techniques described at

With the emergence of sunspot 652, there are now two regions on the sun that pose a threat for strong solar flares (sunspot 649 is the other one). High levels of solar activity are possible this week.

Official Space Weather Advisory issued by NOAA Space Environment Center Boulder, Colorado, USA

2004 July 19 at 03:08 p.m. MDT (2004 July 19 2108 UTC)

Summary For July 12-18
Space weather reached strong levels this period. Minor (R1), moderate (R2), and strong (R3) radio blackouts were observed every day of the summary period due to solar flare activity from active sunspot Regions 646 and 649. Category G1 (minor) and G2 (moderate) geomagnetic storming occurred on 17 July due to a cloud of magnetic material from a solar flare on the Sun that impacted Earth.

Outlook For July 21-27
Space weather for the next week is expected to reach moderate levels with a chance for strong levels. Two complex sunspot clusters currently are visible on the Sun and both have potential to produce R1 (minor) and R2 (moderate) radio blackouts. There is a chance also for an isolated R3 (strong) blackout from these sunspot groups. Minor to moderate geomagnetic storms and radiation storms are also possible.

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Last Updated: 20 Jul 2004