Radial variation of corotating energetic particle streams in the inner and outer solar system

Journal Article · Sun Oct 01 04:00:00 EDT 1978 · J. Geophys. Res.; (United States)

OSTI ID:6270733

Van, M A.I. Hollebeke; McDonald, F B; Trainor, J H; Rosenvinge, T T.v.

The radial gradient of long-lived corotating energetic particle streams is measured by using observations of 0.9-to 2.2-MeV protons from Helios 1 and 2 between 0.3 and 1 AU, Imp 7 at 1 AU, Pioneer 11 at 3.8 AU, and Pioneer 10 between 9 and 10 AU. These studies cover several time periods from mid-1973 to mid-1976. A positive gradient of approx.350%/AU is found between 0.3 and 1 AU. Between 1 AU and some 3--5 AU the gradient is variable with an average value of 100%/AU, which is consistent with the earlier statistical results obtained from the Imp 7 and Pioneer 11 data. A comparison of measurements at 9 and approx.4 AU shows a negative gradient which is variable from -40%/AU to-100%AU. Possible solar latitudinal effects on these gradient studies are also discussed. With the use of solar wind and magnetic field data from Helios 1 between 1 and 0.3 AU the relation between corotating energetic particle events in the inner solar system and the interplanetary medium is examined. It is found that the energetic particles are contained inside the high-speed solar wind stream in a region adjacent to the interaction region between low-speed and high-speed streams.

• Research Organization: Laboratory for High Energy Astrophysics, NASA Goddard Space Flight Center Greenbelt, Maryland 20771
• OSTI ID: 6270733
• Journal Information: J. Geophys. Res.; (United States), Journal Name: J. Geophys. Res.; (United States) Vol. 83:A10; ISSN JGREA
• Country of Publication: United States
• Language: English

Related Subjects

640107* -- Astrophysics & Cosmology-- Planetary Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ACCELERATION
BARYONS
DATA
DATA FORMS
ELEMENTARY PARTICLES
ENERGY RANGE
EXPERIMENTAL DATA
FERMIONS
HADRONS
IMP SATELLITES
INFORMATION
INTERPLANETARY MAGNETIC FIELDS
INTERPLANETARY SPACE
ISOLATED VALUES
MAGNETIC FIELDS
MEV RANGE
MEV RANGE 01-10
NUCLEONS
NUMERICAL DATA
PIONEER SPACE PROBES
PLASMA ACCELERATION
PROTONS
RADIATION STREAMING
RADIATIONS
SATELLITES
SOLAR ACTIVITY
SOLAR PARTICLES
SOLAR PROTONS
SOLAR RADIATION
SOLAR SYSTEM
SOLAR WIND
SPACE
SPACE VEHICLES
STELLAR RADIATION