There has been an increase in the number of large solar flares on the sun in the past week, including the biggest one in six years.
Solar activity is peaking sooner than expected
Increased solar activity could have significant impact on Earth
Space weather forecasting and impacts: what you need to know
The next 'unthinkable' – global disruption from a solar storm
What the next solar maximum means for you - CSIRO
The Engineer - Engineering a response to the solar storm threat
Strongest solar flare in years erupts from the sun
What is a Solar Flare?
How do solar flares form? - Quora
Huge solar flare erupts from sun, may disrupt satellites
Time-Lapse Shows Storms on Sun That Can Cause Radio Blackouts on Earth
Trees tell tale of extreme, unexplained astronomical radiation storms
Back-to-back solar storms headed for Earth could create dazzling
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