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The first clouds were detected inside the Antarctic Circle on Dec. The southern season for NLCs is underway. Sky watchers inside the Arctic Circle should be alert for their intense colors | more data. 20, 2023, the Arctic stratosphere is cold enough for polar stratospheric clouds. NASA's MEERA-2 climate model predicts when the air up there is cold enough: Credit: SDO/AIAĬolorful Type II polar stratospheric clouds (PSC) form when the temperature in the stratosphere drops to a staggeringly low -85C. Switch to: Europe, USA, New Zealand, AntarcticaĮarth is inside a stream of solar wind flowing from this coronal hole. Neutron counts from the University of Oulu's Sodankyla Geophysical Observatory show that cosmic rays reaching Earth are slowly declining-a result of the yin-yang relationship between the solar cycle and cosmic rays. Credit: SDO/HMIĬosmic Rays Solar Cycle 25 is intensifying, and this is reflected in the number of cosmic rays entering Earth's atmosphere. Growing sunspot AR3529 has a beta-gamma magnetic field that poses a threat for strong M-class solar flares.

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