Accession Number : ADA183842
Title : Interplanetary Protons (E sub p approx = 1 MeV) 1973-1986 and out to 22.4 AU.
Descriptive Note : Progress rept.,
Corporate Author : IOWA UNIV IOWA CITY DEPT OF PHYSICS AND ASTRONOMY
Personal Author(s) : Van Allen,J A
PDF Url : ADA183842
Report Date : Aug 1987
Pagination or Media Count : 23
Abstract : This paper uses a homogeneous body of data on mean annual values N of the interplanetary intensity of protons (0.61 Ep 3.41 MeV) in the period 1973-1986 and over the heliocentric radial distance range 1.0 r 22.4 AU. It is found that the quantity N(r-sq) is well correlated with the annual mean sunspot number, with the exception of anomalously low values in 1979, 1980 (in particular), and 1981. The anomaly is attributed to a gross change in the interplanetary magnetic field associated with reversal of the polarity of the sun's polar field. Keywords: Interplanetary Protons; Solar activity.
Descriptors : *SOLAR ACTIVITY, *SOLAR COSMIC RAYS, *PROTONS, VARIATIONS, HOMOGENEITY, INTERPLANETARY SPACE, MAGNETIC FIELDS, MEAN, SOLAR ACTIVITY, SUNSPOTS
Subject Categories : Astrophysics
Distribution Statement : APPROVED FOR PUBLIC RELEASE