Evidence for a Forbush Type of Decrease in the Intensity of Heavy Nuclei of the Primary Cosmic Radiation
- 15 April 1960
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 118 (2), 591-593
- https://doi.org/10.1103/physrev.118.591
Abstract
In an emulsion stack flown on March 13, 1956 from Iowa, the flux of heavy nuclei with in the primary cosmic radiation was measured as 15.8±1.0 and 3.7±0.6 particles/ sec sr for particles of kinetic energy ≥0.23 and ≥1.55 Bev/nucleon, respectively. The measured flux of energy ≥1.55 Bev/nucleon was 57±11% lower than the normal flux. It is shown that almost the entire part of the reduction must be attributed to a large Forbush decrease of the cosmic radiation that occurred at the same time. The exponent of the integral energy spectrum of heavy nuclei () was measured as 1.78±0.24 in the energy interval 0.23 to 9 Bev/nucleon. As this value is not significantly different from its normally measured value, it appears that the large reduction in the primary flux was not accompanied by any significant change in the energy spectrum.
Keywords
This publication has 10 references indexed in Scilit:
- Energy Spectrum of the Heavy Nuclei in the Cosmic Radiation between 7- and 100-Bev/NucleonPhysical Review B, 1959
- Proton Component of the Primary Cosmic RadiationPhysical Review B, 1959
- Flux and Energy Spectrum of Cosmic-RayParticles during Solar MaximumPhysical Review B, 1959
- Abundance of Light Nuclei in the Primary Cosmic RadiationPhysical Review B, 1958
- On the charge and energy spectrum of heavy primaries in cosmic radiationIl Nuovo Cimento (1869-1876), 1958
- The charge distribution of multiply charged nuclei in the primary cosmic radiation part I: The light and medium nucleiPhilosophical Magazine, 1957
- Study of Geomagnetic Cutoff Energies and Temporal Variation of the Primary Cosmic RadiationPhysical Review B, 1957
- Direct Determination of Primary Cosmic-Ray Alpha-Particle Energy Spectrum by New MethodPhysical Review B, 1956
- The Energy Spectrum of Primary Cosmic RadiationPhysical Review B, 1952
- Theoretical geomagnetic effects in cosmic radiationJournal of Geophysical Research, 1950