Germany / France / Japan / Greenland / Australia / United Kingdom / /
Event
Product Issues / Natural Disaster / /
Facility
Kyoto University / U.S. Naval Observatory / One square / /
Holiday
autumnal equinox / Vernal Equinox Day / /
IndustryTerm
gas emanating / optical device / radiation energy / unit energy interval / planetary network / satellite anomaly / index network / geomagnetic applications / energy / flare site / /
NaturalFeature
Pacific Ocean / /
OperatingSystem
BSD / /
Organization
African Union / International Monetary Fund / Data Analysis Center for Geomagnetism / National Oceanic and Atmospheric Administration / U.S. Securities and Exchange Commission / Kyoto University / Kyoto / Air Force Weather Agency / /
GLOSSARY OF SOLAR-TERRESTRIAL TERMS A a index. See Ak index. aa index. A daily and half-daily index of geomagnetic activity determined from the k indices scaled at two nearly antipodal stations at invariant magnetic lati