| Detector: | 4 scintillators (1m x 1m x 0.4m), 64 proportional counters (veto counters) |
| Geographic latitude: | 45.98° N |
| Geographic longitude: | 7.78° E |
| Altitude: | 3133 m asl |
| In operation | 1998-2017 |
The operation of SONTEL was supported by the Swiss National Science Foundation /detectorand by the International Foundation High Altitude Research Stations Jungfraujoch and Gornergrat (HFSJG), CH-3012 Bern, Switzerland.