Despite its seemingly “sunny” appearance, an image of the grinning sun isn’t as cheery as it looks.
NASA’s Solar Dynamics Observatory previously caught an image of the sun in ultraviolet light with three dark spots on its surface on Oct. 26, giving the illusion the sun was smiling. The smiling sun followed a partial solar eclipse Tuesday, though the two events were unrelated.
What many viewed as a giant pumpkin in the sky, though, consequently prompted a minor geomagnetic storm watch on Saturday.
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The dark patches, formally called coronal holes, are areas through which fast solar wind gushes out into space. NOAA’s Space Weather Prediction Center issued an alert on Saturday, stating the coronal holes were “anticipated to enhance and disturb the solar wind environment and lead to unsettled conditions.”
Conditions were expected to go on until Wednesday. However, no “significant transient or recurrent solar wind features” are expected along with geomagnetic storms.
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The coronal holes appear dark on the surface because they’re cooler and less dense than the regions surrounding them. They can develop at any moment and anywhere on the sun, with the capability to disrupt power and other Earth-based systems, including spacecraft operations. Coronal holes are ranked from G1 to G5, with G1 being the least powerful.
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NASA posted on social media that three solar flares were detected in the past week as of Oct. 30, along with 23 coronal mass ejections. The three-minute video shared from NASA’s Solar Dynamic Observatory gave viewers a look at the smiling sun.
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