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Japan Records Geomagnetic Storm Linked to X‑Class Solar Flare

Officials warn the disturbance is likely to persist with potential disruptions to GPS accuracy, shortwave communications and satellite operations.

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Overview

  • The Japan Meteorological Agency reported a magnetic storm at its Kakioka/Ishioka geomagnetic observatory on January 21.
  • The agency measured a maximum geomagnetic variation of 427 nanotesla as of 9 a.m. on January 21.
  • JMA said the disturbance began in the early hours of January 20.
  • Japan’s NICT confirmed an X‑class solar flare occurred at 3:09 a.m. on January 19.
  • Officials believe the storm was triggered by the January 19 flare and advise that ongoing space‑weather conditions could increase GPS errors, disrupt shortwave radio, and affect satellite operations.