What is the relation between cosmic ray and moisture content?

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Anoop Kumar Srivastava

Interesting question .Measurement of soil moisture at intermediate resolutions is a challenge that has been addressed to a certain extent by the Cosmic Ray Soil

Moisture Observing System (COSMOS). COSMOS soil moisture was compared to ET estimates obtained by applying the PT-JPL method to remote sensing products of the Moderate Resolution Imaging Spectroradiometer (MODIS) sensor. Ancillary data included air temperature, humidity, and radiation components. Results show that the COSMOS soil moisture, which is representative of much of the root zone of the pasture field, is well correlated with the modeled ET under most conditions. It was also noted that under high soil moisture conditions with low temperatures, the PTJPL method produced ET values inconsistent with measurements from a local eddy covariance tower, and also with the COSMOS soil moisture. Source :21st International Congress on Modelling and Simulation, Gold Coast, Australia, 29 Nov to 4 Dec 2015 www.mssanz.org.au/modsim2015, PDF enclosed for further reading..

Florian Glodeanu

According to refference: https://www.academia.edu/13073479/Calibration_of_a_catchment_scale_cosmic-ray_probe_network_A_comparison_of_three_parameterization_methods?auto=download

three different parameterization methods are used (i.e. the N0 -method, the hydrogen molar fraction based (hmf) method and the COSMIC operator) to correlate fast neutron intensity and soil moisture content.

For details see refferences:

https://pos.sissa.it/archive/conferences/236/231/ICRC2015_231.pdf

http://research-information.bristol.ac.uk/files/64114545/Franz_2013_Hydrology_and_Earth_System_Sciences.pdf

http://www.hydrol-earth-syst-sci.net/17/3205/2013/hess-17-3205-2013.pdf

Thigesh Vather

There is an inverse relationship between the measured cosmic ray (fast) neutron intensity and the hydrogen present in the measurement area. Thus, soil moisture can be obtained from the cosmic ray neutron intensity once the probe (cosmic ray neutron counter) is calibrated and all the other sources of hydrogen have been accounted (corrected) for.