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Observation data

• Observation data
  • Data plot
• Monthly overviews
• K-index
  • K-index daily sum (Kakioka)
  • K_index_database
• Geomagentic phenomena
  • Geomagnetic storms - monthly overviews
  • Geomagentic phenomena database (Geomagnetic storms・ssc・si・bay・sfe・pi・pc)
• Major geomagnetic storms (ranked) (Kakioka、 Memambetsu、 Kanoya)
• Geomagnetic Variations Dynamic Spectra at Kakioka
• Digital Data Service(Data Download)
• Monthly Data Viewer
• Geomagnetic secular variation（Kakioka, Memambetsu, kanoya and Chichijima）
• Atmospheric electric fields (Kakioka and Memambetsu)
  • monthly means
  • Temporal variations