@Below are monthly summaries for the vertical component of the atmospheric electric potential gradient near the ground surface as observed at Kakioka (Ishioka, Ibaraki Prefecture) and Memambetsu (Ozora, Okhotsk Subprefecture, Hokkaido).
@Observation at Kakioka and Memambetsu was discontinued in February 2021 and March 2011, respectively. Memambetsu data from January to March 2011 are also missing.
