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Polar cap potential distributions during periods of positive imf(interplanetary magnetic field) b(sub y) and b(sub z)
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Slavin, James A. Basinska, Ewa M. Burke, William J. Maynard, Nelson C. Winningham, J. Davi Hanson, William B. |
| Organization | The National Aeronautics and Space Administration (NASA) |
| Copyright Year | 1993 |
| Abstract | We compare the DE-2 electric field measurements used by Heppner and Maynard to illustrate strongly distorted BC convection patterns for IMF(Interplanetary Magnetic Field) Beta(sub Z) greater than 0 and large Beta(sub Y) with simultaneous detections of particle spectra, plasma drifts and magnetic perturbations. Measured potentials greater than 5 keV, driven by the solar wind speeds exceeding 500 km/s are greater than published correlation analysis predictions by up to 27 percent. The potential distributions show only two extrema and thus support the basic conclusion that under these conditions the solar wind IMF drives two- rather than four-cell convection patterns. However, several aspects of the distorted two-cell convection pattern must be revised. In addition to the strong east-west convection in the vicinity of the cusp, indicated by Heppner and Maynard, we also detect comparable components of sunward (equatorward) plasma flow. Combined equipotential and particle precipitation distributions indicate the presence of a lobe cell embedded within the larger, afternoon reconnection cell. Both types rotate in the same sense, with the lobe cell carrying 20-40 percent of the total afternoon cell potential. We detected no lobe cell within morning convection cell. |
| File Size | 731382 |
| File Format | |
| Alternate Webpage(s) | http://www.archive.org/details/nasa_techdoc_19970004294 |
| Archival Resource Key | ark:/13960/t9863d10c |
| Language | English |
| Publisher Date | 1993-01-01 |
| Publisher Institution | Goddard Space Flight Center |
| Access Restriction | Open |
| Subject Keyword | Silicon Dioxide Molten Salts Degradation Microcracks Silicon Nitrides Molybdenum Compounds Reinforcing Fibers Matrix Materials Protective Coatings Oxidation Silicon Carbides Ceramic Fibers Corrosion Thin Films Water Vapor Impurities Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
