Astronomy Picture of the Day

Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.

2000 June 8
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Active Regions, CMEs, and X-Class Flares
Image Credit: ISAS, Yohkoh Project, SXT Group

Explanation: Space Weather forcasters are predicting major storm conditions over the next few days as the active Sun has produced at least three strong flares and a large coronal mass ejection (CME) since Tuesday, June 6th. This recent false colour X-ray image of the Sun shows the active region generating the explosive events, here the Sun's most intense source of X-rays, as the dominant bright area just above centre. X-ray hot plasma suspended in looping magnetic fields arcs above this region, catalogued as AR9026. AR9026 appears as a large group of sunspots in visible light images. The three intense flares were all X-class events, the most severe class of solar flares based on X-ray flux measurements by the earth-orbiting GOES satellites. Energetic particles from the CME, associated with the second X-class flare, were directed toward planet Earth and could produce geomagnetic storms as early as today. Possible effects range from increased auroral displays to disruptions of satellite and communications systems and electrical power grids. But wait ... there's more! In the coming days AR9026, carried slowly across the Sun (from left to right) by solar rotation, is likely to produce even more solar flares.

Tomorrow's picture: Neutron Star-Ring-Jet

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Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (USRA)
NASA Technical Rep.: Jay Norris. Specific rights apply.
A service of: LHEA at NASA/GSFC
& Michigan Tech. U.