Magnetospheric and Interplanetary Electrostatics: A Simple but Explicit Model.
Abstract
This is a generalization of Dungey's 1961 model for the prototype of an 'open' magnetosphere. The magnetic-field lines are traced by superimposing a uniform B field parallel to the geomagnetic dipole axis. There results a quasi-cylindrical separatrix (the 'magnetopause') between field lines that intersect the earth and those that do not. However, the magnetic field outside the magnetosphere can be multiplied by an arbitrary factor (positive or negative) without altering the field-line geometry. Any discontinuity in B at the 'magnetopause' is supported by azimuthal currents there. The electrostatic problem is asymptotically analogous to that of a dielectric cylinder in an asymptotically uniform electric field (which owes its origin to the solar wind in this case). It is easy to map from the asymptotic solution inward and equatorward, since the magnetic field lines are treated as electric equipotentials. The tangential component of the electric field is continuous at the magnetopause but varies between limits that correspond to the 'open' and 'closed' models of the magnetosphere, as defined by the access of interplanetary plasma. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1980
- Accession Number
- ADA087110
Entities
People
- Michael Schulz
Organizations
- The Aerospace Corporation