COSMIC-RAY HYDROGEN AND HELIUM NUCLEI DURING A SOLAR QUIET TIME IN JULY 1961

Journal Article · Mon Feb 10 04:00:00 EST 1964 · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D

DOI:https://doi.org/10.1103/PhysRev.133.B818· OSTI ID:4090842

Fichtel, C E; Guss, D E; Stevenson, G R; Waddington, C J

The energy spectra of low-energy primary cosmic-ray hydrogen and helium nuclei were determined from nuclear emulsions flown on a high-altitude balloon. The flight was preceded by a period of three months of low solar and geophysical activity. The results indicated that the differential spectrum of hydrogen nuclei in this low-energy interval decreased toward low energies and did not exhibit the sharp rise found with counters in 1960 and 1961 by other experimenters. The low-energy differential spectrum and integral flux value for helium nuclei were found to be intermediate between those typical of solar minimum and solar maximum and are consistent with a modulation mechanism that yields the same rigidity spectrum for a given intensity both before and after solar maximum. Various modulation models of galactic cosmic rays are examined, and it is concluded that none of them seem to be entirely adequate. (auth)

• Research Organization: Goddard Space Flight Center, Greenbelt, Md.
• NSA Number: NSA-18-009054
• OSTI ID: 4090842
• Journal Information: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 133; ISSN PHRVA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ALPHA PARTICLES
BALLOONS
COSMIC RADIATION
ENERGY
ENERGY RANGE
LEVELS
MEASURED VALUES
MODULATION
NUCLEAR EMULSIONS
PARTICLE TRACKS
PHYSICS
PROTONS
QUANTITATIVE ANALYSIS
SPECTRA
STRATOSPHERE
SUN
VARIATIONS