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Four-Day Geomagnetic Storm Ends as Forecasts Turn Quiet

Scientists say an Oct. 3 plasma cloud now appears too slow to disturb Earth's magnetosphere.

Overview

  • Ground measurements show Kp indices back in the green zone since late Oct. 3, marking the storm's conclusion.
  • The disturbance lasted about four days and briefly reached strong G3+ levels with Kp near 7.33 around Sept. 30–Oct. 1.
  • Sunday's outlook calls for calm geomagnetic conditions with only slightly elevated flare activity and no signs of rapid growth.
  • The M1.5 flare on Oct. 3 from active region 4232 produced a CME on the Sun–Earth line, but updated analysis finds low speeds and minimal impact.
  • Arrival of the associated plasma is expected around Oct. 8, and researchers do not anticipate geomagnetic effects as overall solar activity remains elevated after September's F10.7 jump to 201.