Energetic protons accelerated by corotating shocks: Pioneer 10 and 11 observations from 1 to 6 AU

Journal Article · Wed Sep 01 00:00:00 EDT 1982 · J. Geophys. Res.; (United States)

DOI:https://doi.org/10.1029/JA087iA09p07389· OSTI ID:6576689

Tsurutani, B T; Smith, E J; Pyle, K R; Simpson, J A

The Pioneer 10 and 11 Jet Propulsion Laboratory vector helium magnetometer and the University of Chicago 0.5- to 1.8-MeV proton telescope data are used to examine the relationship between low-energy proton increases and corotating interaction regions (CIR's) in the heliosphere between 1 and 6.3 AU. The 0.5- to 1.8-MeV proton flux enhancements are correlated with the forward and reverse shocks bounding the CIR's. Fifty to sixty percent of all identified shocks are accompanied by time-coincident proton events. Conversely, almost all proton events occurring at CIR boundaries are associated with shocks: 92% of all proton events detected at the leading boundary are accompanied by forward shocks, and 72% of the proton events near the trailing CIR edge are associated with reverse shocks. Proton intensities are highest when the shock normal angle with respect to the magnetic field direction is > or =80/sup 0/, for both forward and reverse shocks.

• Research Organization: Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109
• OSTI ID: 6576689
• Journal Information: J. Geophys. Res.; (United States), Vol. 87:A9
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
SOLAR PROTONS
SHOCK WAVES
INTERPLANETARY SPACE
PIONEER SPACE PROBES
PLASMA
SOLAR WIND
BARYONS
ELEMENTARY PARTICLES
FERMIONS
HADRONS
NUCLEONS
PROTONS
RADIATIONS
SOLAR ACTIVITY
SOLAR PARTICLES
SOLAR RADIATION
SPACE
SPACE VEHICLES
STELLAR RADIATION
VEHICLES
640104* - Astrophysics & Cosmology- Solar Phenomena