Accession Number : AD0664509

Title :   THE INTERPLANETARY MAGNETIC FIELD: SOLAR ORIGIN AND TERRESTRIAL EFFECTS.

Descriptive Note : Technical rept.,

Corporate Author : CALIFORNIA UNIV BERKELEY SPACE SCIENCES LAB

Personal Author(s) : Wilcox,John M.

Report Date : 08 JAN 1968

Pagination or Media Count : 139

Abstract : Many observations related to the large-scale structure of the interplanetary magnetic field, its solar origin and terrestrial effects are discussed. During the period observed by spacecraft the interplanetary field was dominated by a sector structure corotating with the sun in which the field is predominantly away from the sun (on the average in the Archimedes spiral direction) for several days (as observed near the earth), and then toward the sun for several days, etc. The average sector appears to be a coherent entity with internal structure such that its preceding portion is more active than its following portion. Cosmic rays corotate with the interplanetary field, and there are differential flows associated with the sector pattern. Profound effects on geomagnetic activity and the radiation belts are produced as the sector pattern rotates past the earth. The solar origin of the sector pattern is discussed. The solar source may be associated with the large-scale weak background photospheric fields observed with the solar magnetograph. It is suggested that there may be a rather continual relation between this solar structure and terrestrial responses, of which the recurring M-Region geomagnetic storms are just the most prominent example. (Author)

Descriptors :   (*SPACE ENVIRONMENTS, *MAGNETIC FIELDS), (*SOLAR WIND, SPACE ENVIRONMENTS), (*MAGNETOSPHERE, INTERACTIONS), COSMIC RAYS, INTERACTIONS, SOLAR DISTURBANCES, SUNSPOTS, SOLAR RADIATION, CORRELATION TECHNIQUES, VAN ALLEN RADIATION BELT, DIURNAL VARIATIONS, SCIENTIFIC SATELLITES, PROTONS

Subject Categories : Astrophysics
      Atmospheric Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE