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Table 1 Estimated TEC of once per one, 10, and 100 years in Tokyo, Kagoshima, and Hokkaido

From: Statistical analysis of ionospheric total electron content (TEC): long-term estimation of extreme TEC in Japan

  Once-in-1-year TEC Once-in-10-year TEC Once-in-100-year TEC
22-year TEC data Method 1 Method 2 Method 1 Method 2
Tokyo ~ 90 ~ 110 ~ 110 ~ 130 ~ 150 ~ 190
Kagoshima ~ 110 ~ 130 ~ 130 ~ 155 ~ 180 ~ 230
Hokkaido ~ 70 ~ 90 ~ 90 ~ 105 ~ 120 ~ 150
  1. The unit is in TECU