Geomagnetic Activity and Hale Sector Boundaries.

Abstract

The variation of the geomagnetic activity index Ap at the Interplanetary Magnetic Field (IMF) sector boundaries (+ to - and - to +) has been studied for three solar cycles, separating data into vernal and autumnal equinoxes. It was found that a reported increase in Ap as an effect of a Hale boundary can be better attributed to the occurrence of a negative IMF Bz component in the geocentric solar magnetospheric coordinate system and to the occurrence of high speed solar wind streams.

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 1980
Accession Number
ADA083029

Entities

People

  • Henrik Lundstedt
  • J. M. Wilcox
  • P. H. Scherrer

Organizations

  • Stanford University

Tags

Communities of Interest

  • Autonomy

DTIC Thesaurus Topics

  • Abstracts
  • Aeronautics
  • Atmospheric Sciences
  • Boundaries
  • California
  • Contracts
  • Coordinate Systems
  • Cycles
  • Magnetic Fields
  • Military Research
  • Northern Hemisphere
  • Solar Cycle
  • Solar Wind
  • Southern Hemisphere
  • Space Sciences
  • Universities
  • Wind Velocity

Fields of Study

  • Physics

Readers

  • Space/Atmospheric Physics.