LARGE CME BURST ON JULY 20TH, 2017


GEOMAGNETIC UNREST: Earth is entering a stream of solar wind flowing from a hole in the sun's atmosphere. This is causing geomagnetic unrest around the poles. High-latitude sky watchers should be alert for auroras on July 21st, especially in the southern hemisphere where winter darkness favors visibility. Free: Aurora Alerts
CME SWEEPS ASIDE COSMIC RAYS: On July 16th, a CME hit Earth's magnetic field, sparking two days of geomagnetic storms and beautiful southernauroras. The solar storm cloud also swept aside some of the cosmic rays currently surrounding Earth. Spaceweather.com and the students of Earth to Sky Calculus launched a space weather balloon to the stratosphere hours after the CME arrived. We detected a 7% decrease in X-rays and gamma-rays (two tracers of secondary cosmic rays). Neutron monitors in the Arctic and Antarctic recorded similar decrements. For instance, these data from the Bartol Research Institute show a nearly 8% drop in cosmic ray neutrons reaching the South Pole:


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