A potential geomagnetic storm is expected to impact Earth on Wednesday, September 25, following a large eruption from sunspot AR3835. This eruption, known as a coronal mass ejection (CME), occurred unexpectedly on Sunday, September 22. Although most of the solar plasma ejected by this event is forecast to miss Earth, a glancing blow remains possible. The timing of the eruption is critical, as it coincides with Earth’s autumnal equinox—a period when geomagnetic storms are more likely to occur due to specific alignments between Earth’s and the sun’s magnetic fields. Unexpected Solar Activity fro…