Thursday, May 9, 2019


May 9th began with a bang. Big sunspot AR2740 produced another solar flare, this time an impulsive C7-category explosion. Telescopes onboard NASA's Solar Dynamics Observatory captured the extreme ultraviolet flash:

Radiation from the flare briefly ionized the top of Earth's atmosphere, causing a brownout of shortwave radiation over Asia and the Indian Ocean: map. Frequencies affected were mainly below 20 MHz. Ham radio operators and ships at sea using shortwave transceivers may have noticed the disturbance on May 9th around 05:50 UT.

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