3-NM64 Neutron Monitor Jungfraujoch

NM64 neutron monitor	Housing of NM64 neutron monitor

---

General description

The detector is housed on the rollf of the Research Station Jungfraujoch.

Detector:	Standard 3-NM64 neutron monitor (3 units of 1 counter)
Geographic latitude:	46.55° N
Geographic longitude:	7.98° E
Altitude:	3475m asl
Effective vertical cutoff rigidity (Epoch 2000.0):	4.49 GV
In continous operation since	1986

The operation of the neutron monitor is supported by the Swiss National Science Foundation, grant NF 20-067092.01 and by the International Foundation High Altitude Research Stations Jungfraujoch and Gornergrat (HFSJG), CH-3012 Bern, Switzerland.

Atmospheric Pressure Measurements

An aeroid barometer (GB 1, Meteolabor AG CH-8620 Wetzikon, Switzerland) is used inside the housing of the neutron monitor station.

Data Acquisition System

The one-minute and five-minute readings of the three neutron monitor sections are recorded together with date, time and barometric pressure by a Linux-PC on harddisk. The exact time is taken by a radio watch (DCF 77 EAP 31, W. Meinberg, D-3280 Bad Pyrmont, Germany).

Barometric Correction

The cosmic ray data are pressure corrected using a barometric coefficient of 0.96% per mmHg. The counting rates are corrected to an average pressure of 482 mmHg.