Simpson Neutron Monitor Network, USA
University of Delaware / Bartol
Bartol operates 9 neutron monitors in the United States, Canada, Greenland and Antarctica. Seven of these are part of Spaceship Earth.
- Fort Smith Neutron Monitor
- Inuvik Neutron Monitor
- McMurdo Neutron Monitor
- Nain Neutron Monitor
- Newark Neutron Monitor
- Peawanuck Neutron Monitor
- South Pole Bare Neutron Monitor
- South Pole Neutron Monitor
- Thule Neutron Monitor
University of New Hampshire / UNH
UNH has operated up to 6 neutron monitors.
- Climax Neutron Monitor
- Durham Neutron Monitor
- Haleakala Neutron Monitor
- Huancayo
- Leadville Neutron Monitor
- Mount Washington Neutron Monitor
University of Wisconsin-River Falls/UWRF
UWRF took over the operation of the South Pole NMs from Bartol.