Greenwich (GRW) observatory

IAGA code	GRW
Location	Greenwich
Country	United Kingdom
Open-Close	1836-1926 replaced by ABN

Website	http://geomag.bgs.ac.uk/operations/greenwich.html

Altitude	50 m

Geographic coordinates		Geomagnetic coordinates (IGRF-13 2020.5)		Corrected geomagnetic coordinates (IGRF-13 2020.5)
Latitude	Longitude	Latitude	Longitude	Latitude	Longitude
51.477°N	0°E	53.15°N	84.6°E	47.14°N	77.29°E

GRW contributed to aa indices				K=9 lower limit	526 nT