Refreshing your browser will update the aurora shown.
Link to USGS home page.
National Geomagnetism Program

San Juan (SJG) Geomagnetic Observatory

The San Juan observatory sign.

Station Id: SJG
Location: Cayey, PR
Latitude: 18.11°N
Longitude: 66.15°W
Elevation: 424 meters
Orientation: HDZF

Sections

Background

The Geomagnetism Program has operated an observatory at Puerto Rico since 1903. The current observatory site, consisting of 36 acres in the mountains near Cayey,has been in use since 1965.

Other Operations at San Juan

Customers

Photos

Cayey, PR magnetic observatory.

Cayey, PR magnetic observatory.

Absolutes, variations and proton buildings at Cayey magnetic observatory, Puerto Rico.

Absolutes, variations and proton buildings at Cayey magnetic observatory, Puerto Rico.

* Pictures courtesy of Jeff Fox

USA.gov logo  Take Pride in America button