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