Pitch Angle Distributions of 0.6-1.8 MeV Protons Observed by Voyager 1 at 85-87 AU

Journal Article · Wed Sep 15 00:00:00 EDT 2004 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.1809512· OSTI ID:20633018

Decker, R B; Krimigis, S M; Roelof, E C ^[1]; Burlaga, L F ^[2]; Ness, N F ^[3]

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1. Applied Physics Laboratory, Johns Hopkins University, Johns Hopkins Rd, Laurel, MD 20723 (United States)
2. NASA Goddard Space Flight Center, Greenbelt, MD 20771 (United States)
3. Bartol Research Institute, University of Delaware, Newark, DE 19716 (United States)

We combined daily averages of magnetic field vector data and 0.6-1.8 MeV proton angular intensity data to construct 32 pitch angle distributions (PADs) for measurements made by Voyager 1 (V1) at 85-87 AU. The PADs were observed during the period 2002.6-2003.1, when energetic particle instruments on V1 measured unusually high intensities. The angular data show large, mainly unidirectional beaming of protons most often in the -T direction, i.e., away from the sun in the sense of a spiral magnetic field. The mean anisotropy amplitude based on the 32 samples is 0.55{+-}0.21.

• OSTI ID: 20633018
• Journal Information: AIP Conference Proceedings, Vol. 719, Issue 1; Conference: 3. international IGPP conference on physics of the outer heliosphere, Riverside, CA (United States), 8-13 Feb 2004; Other Information: DOI: 10.1063/1.1809512; (c) 2004 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
AMPLITUDES
ANGULAR DISTRIBUTION
ANISOTROPY
COSMIC PROTONS
INTERPLANETARY MAGNETIC FIELDS
MEV RANGE
SOLAR WIND
SUN
VOYAGER SPACE PROBES