Second Substantial Flare in Two Days
The sun emitted a mid-level solar flare, peaking at 9:59 p.m. EDT on Oct. 21, 2014. NASA's Solar Dynamics Observatory, which is always observing the sun, captured an image of the event. The same active region previously emitted an X1.1 solar flare on Oct. 19. Solar flares are powerful bursts of radiation. Harmful radiation from a flare cannot pass through Earth's atmosphere to physically affect humans on the ground, however -- when intense enough -- they can disturb the atmosphere in the layer where GPS and communications signals travel.
This flare is classified as an M 8.7-class flare.
M-class denotes flares that are a tenth as strong as X-class flares, which are the most intense flares. The number provides more information about its strength. An M2 is twice as intense as an M1, an M3 is three times as intense, etc.
Scott Wiessinger (USRA): Producer
Genna Duberstein (USRA): Producer
Aaron E Lepsch (ADNET Systems, Inc.): Project Support
Karen Fox (ASI): Writer
Please give credit for this item to:
NASA's Goddard Space Flight Center. However, individual images should be credited as indicated above.