SHOCKWAVE SPARKS AURORAS: A minor interplanetary shock wave jolted Earth's magnetic field during the early hours of June 30th, sparking rare midsummer auroras over Canada and some northern-tier US states. It might have been the edge of a CME originally expected to arrive on July 1st. If not, another jolt could occur in the next 24 hours. Full story @ Spaceweather.com.
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Above: Auroras and noctilucent clouds over Alberta, Canada, on June 30, 2021. Credit: Catalin Tapardel
