TheInternationalAssociationofGeomagnetismandAeronomy(IAGA)hasreleasedthe12thGenerationInternationalGeomagneticReferenceField—thelatestversionofastandardmathematicaldescriptionoftheEarth'smainmagneticfieldthatisusedwidelyinstudiesoftheEarth'sdeepinterior,itscrustanditsionosphe