The Geomagnetism Program established an observatory near Fresno in 1980. The observatory is on the USFS San Joaquin Experimental Range (SJER) of the US Forest Service under terms of an agreement with the USGS and the Geomagnetism Program.
![Area around the Fresno magnetic observatory.](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/side_image/public/thumbnails/image/fresno.jpg?itok=ZcN3loCD)
Station Id: FRN
Location: O'Neals, CA
Latitude: 37.0913°N
Longitude: 119.7193°W
Geomagnetic Latitude: 43.12°N*
Geomagnetic Longitude: 306.64°E*
Elevation: 331 meters
Orientation: HDZF
* IGRF values as of 2015.
Photos:
![Fresno magnetic observatory.](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/side_image/public/thumbnails/image/Fresno_third_size.jpg?itok=GIGCJVT2)
The Geomagnetism Program established an observatory near Fresno in 1980. The observatory is on the USFS San Joaquin Experimental Range (SJER) of the US Forest Service under terms of an agreement with the USGS and the Geomagnetism Program.
![Area around the Fresno magnetic observatory.](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/side_image/public/thumbnails/image/fresno.jpg?itok=ZcN3loCD)
Station Id: FRN
Location: O'Neals, CA
Latitude: 37.0913°N
Longitude: 119.7193°W
Geomagnetic Latitude: 43.12°N*
Geomagnetic Longitude: 306.64°E*
Elevation: 331 meters
Orientation: HDZF
* IGRF values as of 2015.
Photos:
![Fresno magnetic observatory.](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/side_image/public/thumbnails/image/Fresno_third_size.jpg?itok=GIGCJVT2)