ACS  Vol.3 No.4 , October 2013
The Neutron Flux Variation in the Earth’s Atmosphere Depending on the Solar Proton Flux

The Earth is continually exposed to the cosmic radiation of both solar and galactic origin. Solar eruption and solar ac- tivity may affect cosmic radiation flux density which has a secondary effect on the flux of particles in the atmosphere as well. Such one event was recorded in the last week of October 2003, where the measured dose rate of the cosmic radia- tion in the aircraft ATR 42 was 1.8 times higher than the average value of the other measurements. Later we found the data on an unusual solar activity in the mentioned time interval. Analysis of the increasing solar proton flux during the solar flare, as well as the decreasing neutron flux in the atmosphere (representing the galactic radiation), on May 14 and 15, 2005, showed a nonlinear correlation with the exponential equation of regression; this one described galactic ray modulation by solar flux during the short term variation of cosmic radiation.

Cite this paper
M. Poje, B. Vuković, M. Pajtler, V. Radolić, I. Miklavčić and J. Planinić, "The Neutron Flux Variation in the Earth’s Atmosphere Depending on the Solar Proton Flux," Atmospheric and Climate Sciences, Vol. 3 No. 4, 2013, pp. 481-485. doi: 10.4236/acs.2013.34050.
[1]   L. Anchordoqui, T. Paul, S. Reucroft and J. Swain, “Ultrahigh Energy Cosmic Rays: The State of the Art before the Auger Observatory,” International Journal of Modern Physics A, Vol. 18, No. 13, 2003, pp. 2229-2366.

[2]   T. Geisser, “Cosmic Rays and Particle Physics,” Cambridge University Press, Cambridge, 1999.

[3]   D. T. Bartlett, “Radiation Protection Aspects of the Cosmic Radiation Exposure of Aircraft Crew,” Radiation Protection Dosimetry, Vol. 109, No. 4, 2004, pp. 349-355. rpd/nch311

[4]   P. Goldhagen, “Overview of Aircraft Radiation Exposure and Recent ER-2 Measurements,” Health Physics, Vol. 79, No. 5, 2000, pp. 526-544.

[5]   S. Solanki, I. Usoski, B. Kromer, M. Schüessler and J. Beer, “Unusual Activity of the Sun During Recent Decades Compared to the Previous 11,000 Years,” Nature, Vol. 431, No. 7012, 2004, pp. 1084-1087.

[6]   R. J Sheu and S. H. Jiang, “Cosmic-Ray-Induced Neutron Spectra and Effective Dose Rates Near Air/Ground and Air/Water Interfaces in Taiwan,” Health Physics, Vol. 84, No. 1, 2003, pp. 92-99.

[7]   P. Goldhagen, J. M. Clem and J. W. Wilson, “The Energy Spectrum of Cosmic-Ray Induced Neutrons Measured on an Airplane over a Wide Range of Altitude and Latitude,” Radiation Protection Dosimetry, Vol. 110, No. 1-4, 2004, pp. 387-392.

[8]   P. Maestro, H. S. Ahn, P. Allison, et al., “Elemental Energy Spectra of Cosmic Rays Measured by CREAM-II,” Proceedings of the 31st International Cosmic Ray Conference, Lodz, 7-15 July 2009, Article ID: icrc0641.

[9]   R. Mewaldt, M. Looper, C. Cohen, D. Haggerty, A. Labrador, R. Leske, G. Mason, J. Mazur and T. von Rosenvinge, “Energy Spectra, Composition, and Other Properties of Ground-Level Events during Solar Cycle 23,” Space Science Reviews, Vol. 171, No. 1-4, 2012, pp. 97-120. 10.1007/ s11214-012-9884-2

[10]   G. F. Krymsky, V. G. Grigorev and S. A. Stardubtsev, “New Method for Estimating the Absolute Flux and Energy Spectrum of Solar Cosmic Rays Based on NeutronMonitor Data,” Journal of Experimental and Theoretical Physics Letter, Vol. 88, No. 7, 2008, pp. 411-413. 10.1134/ S0021364008190016

[11]   Yu. V. Balabin, E. V. Vashenyuk, O. V. Mingalev, A. I. Podgorny and I. M. Podgorny, “The Spectrum of Solar Cosmic Rays: Data of Observations and Numerical Simulation,” Astronomy Reports, Vol. 49, No. 10, 2005, pp. 837-846.

[12]   P. A. Colgan, H. Synnott and D. Fenton, “Individual and Collective Doses from Cosmic Radiation in Ireland,” Radiation Protection Dosimetry, Vol. 123, No. 4, 2007, pp. 426-434. 10.1093/ rpd/ncl527

[13]   United Nations Committee on the Effects of Atomic Radiation, Sources and Effects of Ionising Radiation, UNSCEAR, New York, 2000.

[14]   P. Goldhagen, M. Reginatto, T. Kniss, J. Wilson, J. Singlettery, I. Jones and W. van Steveninck, “Measurement of the Energy Spectrum of Cosmic-Ray Induced Neutrons aboard an ER-2 High-Altitude Airplane,” Nuclear Instruments and Methods in Physics Research A, Vol. 476, No. 1-2, 2002, pp. 42-51.

[15]   F. Tuo, L. Shou, C. Xu, Y. Yao, T. Ren and Q. Zhou, “Measurement of Cosmic Radiation Dose to Air Crew Connecting for a Typical Polar Route Flight,” Journal of Radioanalytical and Nuclear Chemistry, Vol. 293, No. 3, 2012, pp. 935-939.

[16]   W. Heinrich, S. Roesler and H. Schraube, “Physics of Cosmic Radiation Fields,” Radiation Protection Dosimetry, Vol. 86, No. 4, 1999, pp. 253-258.

[17]   A. Wawrzynczak and M. V. Alania, “Modeling and Data Analysis of a Forbush Decrease,” Advances in Space Research, Vol. 45, No. 5, 2010, pp. 622-631.

[18]   O. Okike and A. B. Collier, “A Multivariate Study of Forbush Decrease Simultaneity,” Journal of Atmospheric and Solar-Terrestrial Physics, Vol. 73, No. 7, 2011, pp. 796-804. 10.1016/ j.jastp.2011.01.015

[19]   Oulu Neutron Monitor. year2005&starttime=00%3A00&endday=15&endmonth=05&endyear=2005&endtime=23%3A0&reso lution=Automatic+choice

[20]   B. Vukovic, I. Lisjak, V. Radolic, B. Vekic and J. Planinic, “Measurements of the Dose Due to Cosmic Rays in Aircraft,” Nuclear Instruments and Methods in Physics Research A, Vol. 562, No. 1, 2006, pp. 517-520.

[21]   I. Getley, “Observation of Solar Particle Event on Board a Commercial Flight from Los Angeles to New York on 29 October 2003,” Space Weather, Vol. 2, No. 5, 2004, Article ID: S05002. 10.1029/ 2003SW000058

[22]   Solar Data Charts, 2003.

[23]   J. W. Wilson, “Overview of Radiation Environments and Human Exposures,” Health Physics, Vol. 79, No. 5, 2000, pp. 470-494.

[24]   NOAA Space Environment Services Center, Solar Proton Events Affecting the Earth Environment.

[25]   M. Poje, B. Vukovic, M. Varga, V. Radolic, I. Miklavcic, D. Faj and J. Planinic, “Relation between Galactic and Solar Cosmic Radiation at Aviation Altitude,” Advances in Space Research, Vol. 42, No. 12, 2008, pp. 1913-1916.