Accession Number : ADA188592

Title :   Electric Fields in Earth Orbital Space. Magnetospheric Structural Dynamic Response to External Variables.

Descriptive Note : Annual rept. Oct 86-Nov 87,

Corporate Author : MCDONNELL DOUGLAS ASTRONAUTICS CO HUNTINGTON BEACH CA

Personal Author(s) : Olson, W P ; Pfitzer, K A

PDF Url : ADA188592

Report Date : Nov 1987

Pagination or Media Count : 22

Abstract : It is known that the magnetosphere responds dynamically to changes in the interplanetary magnetic field (IMF). Instead of qualitative reconnection theory (which we believe is basically incorrect), we have examined this response in terms of electromagnetic wave propagation in the interplanetary region. We suggest that the interplanetary plasma (solar wind) is magnetized by the solar magnetic sector structure. Electromagnetic waves of high frequency can propagate through the solar wind without appreciable attenuation. It is the interaction of these disturbance waves with the magnetosphere that causes the observed magnetospheric response to the IMF. We have examined quantitatively the propagation of electromagnetic disturbances in the interplanetary region and their interaction with the magnetosphere. Only certain modes propagate and there are further restrictions on the waves at the magnetopause. We have shown that a southward turning wave enters the tail of the magnetosphere and weakens the magnetic field in the plasma sheet. A northward turning wave increases the field. In this report we present the implications of these waves on substorm dynamics. Keywords: Electromagnetic waves; Electromagnetic plasmas; Magnetosphere; Magnetic fields; Electric fields.

Descriptors :   *MAGNETOSPHERE, *SOLAR WIND, ATTENUATION, DYNAMIC RESPONSE, DYNAMICS, EARTH ORBITS, ELECTRIC FIELDS, ELECTROMAGNETIC RADIATION, ELECTROMAGNETIC WAVE PROPAGATION, ELECTROMAGNETISM, EXTERNAL, HIGH FREQUENCY, INTERPLANETARY SPACE, MAGNETIC FIELDS, PLASMAS(PHYSICS), SPACE ENVIRONMENTS, VARIABLES

Subject Categories : Geomagnetism
      Astrophysics

Distribution Statement : APPROVED FOR PUBLIC RELEASE