Apatity Neutron Monitor
- Geographic coordinates
- Altitude above sea level
- Effective vertical cutoff rigidity
- Detector
- In continuous operation
- Time resolution in database
- 67.57°N, 33.39°E
- 181 m
- 0.65 GV
- Standard 18-NM-64 neutron monitor
- May 1969
- 1 hour before July 2000, 10 sec since July 2000
Plot of current data (updated every minute)
Online database
CONDITIONS FOR USE OF DATA
You are welcome to use the online Apatity neutron monitor data under following conditions:
- To get access to the online database contact Prof. Eduard V. Vashenyuk, e-mail:
- Please acknowledge the source of data in any publication, for example: “Apatity neutron monitor data were kindly provided by the Polar Geophysical Institute of the Russian Academy of Sciences (PGI, Apatity)”
- Commercial or industrial use of the data is not allowed without a prior agreement with the PGI administration
- The online data for the current month should be considered as preliminary and used with a care
The dead time is the period during which the registration channel is closed after detecting the next neutron.
There are two kinds of Apatity NM count rate data: with Large dead time (LDT) and Small dead time (SDT). The size of LDT, 1200 microseconds, is chosen so that to block the channel on a lifetime of multiplicity neutrons in the neutron monitor. Thus, at use the LDT to each primary neutron there corresponds one pulse. The result is in a better statistical accuracy of registered count rate of neutrons. Compensation of losses because of dead time is provided with a special electronic circuit. The channel with small dead time, 10 microseconds (same as in the original neutron monitor of Charmichael), collects pulses from all registered neutrons, including ones of multiplicity.
Count rates: uncorrected, corrected for pressure, barometrical pressure.