Calculation of Cosmic-Ray Proton and Anti-Proton Spatial Distribution in Magnetosphere

Details Calculation of Cosmic-Ray Proton and Anti-Proton Spatial Distribution in Magnetosphere Calculation of Cosmic-Ray Proton and Anti-Proton Spatial Distribution in Magnetosphere

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....4.2073f&link_type=abstract

Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I

Physics

Scientific paper

We calculated the motion of protons and anti-protons around the Earth to show their spatial distribution. The protons and antiprotons from decay of albedo (produced) neutorons and antineutrons can represent the concentration in the SAA region. The antiprotons concentrate more than the protons because of the higher energy spectra. 1 Introduction The charged cosmic-ray particles are flying around the Earth as well known trapped radiation belts. The experimental data in the low orbit showed the concentration in the both geomagnetic poles and the SAA (South Anomaly of Antarctica) region[3]. Their energy and flux are important problems as the radiation environment. The recent balloon experiments[5] have been disclosing the energy spectra of antiprotons around the Earth. The observation of spatial distribution and energy spectra of antiprotons are planned in the near future international space station observatory. 2 method 2.1 Equation of motion of the charged particle The motion of the charged particle is descrived by the Newtonian equation with the Lorentz force as follows. q dP = (P × B) (1) dt m The prepresents the momentum of a particle, of which mass and charge are m and q . The bshows the magnetic field. The Earth's magenetic field is approximated by the dip ole field. This motion was well examined and predicted the existence of the radiation belts by Stormer[1]. Actually it was very suprizing ¨ that Van Allen et al found them with the early spacecrafts. Recenty the whole spatial distributions of main components, protons and electrons are revealed[3]. But the spatial distribution of antiprotons are not clear due to very few amounts.

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