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This flux calculator is for standard JESD89B.

Use this calculator to determine the relative neutron flux at a particular location. The output value is relative to the sea-level flux in New York City, New York, USA at a time of average solar modulation in the past when the geomagnetic rigidity cutoff at New York City was 2.08 GV. The reference flux has been kept the same as it was for JESD89A. (From 1995 to 2010, the calculated rigidity cutoff at New York City changed from 2.08 GV to 2.32 GV, so the flux factor for New York City at sea level is now 0.99 instead of 1.00.)

NOTE: The reference flux and spectrum apply only to locations on the ground. Fluxes calculated from them using this calculator are not accurate for airplanes or any situation far from the ground.

Instructions for use are here (opens a new window) and summarized at the bottom of this page.

Location
Latitude
Longitude
Elevation, Pressure or Depth - Enter a single value and check the appropriate box
Elevation
Station pressure
Atmospheric depth g/cm2
Solar Modulation
Solar modulation % (0 is minimum flux / active sun,
100 is maximum flux / quiet sun)
Relative flux (NYC, NY, USA = 1.00)
The following parameters refer to values calculated as described in Annex A of JESD89B
Elevation
Station pressure
Atmospheric depth g/cm2
Fa parameter (0 elevation, 1033.2 g/cm2 depth = 1.00)
Fb parameter (2.08 GV rigidity cutoff = 1.00)
Rigidity cutoff (see cutoff map)

Last modified: 04/30/2024 18:08:36

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Enter latitude and longitude for the location of interest.  Enter either the elevation, barometric station pressure or the atmospheric depth of the location. Pressing Submit will validate the entered values and output the relative flux. 

NOTE: The "Station Pressure" is the mean, uncorrected barometer reading for the location. Values from the National Weather Service are generally corrected back to their equivalent value at sea-level and are unsuitable for this calculation.

Values of geomagnetic vertical cutoff rigidity used to calculate the relative neutron flux were provided by the U.S. Federal Aviation Administration Civil Aerospace Medical Institute, Protection and Survival Research Laboratory. The cutoff values were calculated by D. F. Smart and M. A. Shea using the International Geomagnetic Reference Field for 2010.

References

M. S. Gordon, P. Goldhagen, K. P. Rodbell, T. H. Zabel, H. H. K. Tang, J. M. Clem, and P. Bailey, "Measurement of the Flux and Energy Spectrum of Cosmic- Ray Induced Neutrons on the Ground," IEEE Transactions on Nuclear Science, vol. 51, no. 6, pp. 3427-3434, Dec. 2004.

J. Clem and L. Dorman, "Neutron monitor response functions," Space Sci. Rev., vol. 93, no. 1-2, pp. 335-363, 2000, and references therein.

A. Belov, A. Struminsky, and V. Yanke, "Neutron Monitor Response Functions for Galactic and Solar Cosmic Rays", 1999 ISSI Workshop on Cosmic Rays and Earth, poster presentation and personal communication, 1999.

Smart, D. F., and M. A. Shea, "Final Report: Vertical Geomagnetic Cutoff Rigidities for Epoch 2010" and "Table from IGRF 2010 field," Appendices A and G in K. Copeland, CARI-7 Documentation: Geomagnetic Cutoff Rigidity Calculations and Tables for 1965-2010, Federal Aviation Administration Office of Aerospace Medicine Report DOT/FAA/AM-19/4 (2019), https://www.faa.gov/data_research/research/med_humanfacs/oamtechreports/2010s/media/201904.pdf (in press).

 

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Last modified: April 30, 2024