Observation of cosmic ray flux variations in stratosphere

Physics

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Charged Particles, Cosmic Rays, High Altitude Balloons, Magnetic Flux, Stratosphere, Variations, Geomagnetic Pulsations, Magnetic Fields, Oscillations, Solar Wind

Scientific paper

Studies of cosmic rays in the stratosphere were conducted during 1975-1981 using balloons and high altitude aircraft. The aircraft was flown at altitudes of 16 to 20 km and had equipment for measuring the vertical proton flux with energies of Ep = 350 to 1,000 MeV, the omnidirectional neutron flux at energies of En = 0.025 eV + 10 MeV and the omnidirectional charged particle flux with energies of Ee 1.3 MeV and Ep 20 MeV. The balloons measured the vertical electron flux in an energy range of 50 to 500 KeV. All the data indicated the existence of pulsating cosmic ray flux variations in the auroral region with characteristic pulsation times of 150 to 400 sec. Possible mechanisms generating these pulsations include pulsations of the solar diameter or oscillations of the solar surface which cause pulsations in the density and velocity of the solar wind and consequently the interplanetary magnetic field. It is noted that the natural period of magnetospheric line of force oscillations for latitudes of about 70 deg N is approximately 400 sec. No firm conclusions were drawn though it is indicated that geomagnetic pulsations are related to the preflare situation on the Sun.

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