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Anomalous aspects of magnetosheath flow and of the shape and oscillations of the magnetopause during an interval of strongly northward interplanetary magnetic field
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Chen, Sheng-Hsien Walker, Raymond T. Gosling, Jack T. Kivelson, Margaret G. Lazarus, Allan J. |
| Copyright Year | 1992 |
| Description | On 15 Feb. 1978, the orientation of the interplanetary magnetic field (IMF) remained steadily northward for more than 12 hours. The ISEE 1 and 2 spacecraft were located near apogee on the dawn side flank of the magnetotail. IMP 8 was almost symmetrically located in the magnetosheath on the dusk flank and IMP 7 was upstream in the solar wind. Using plasma and magnetic field data, we show the following: (1) the magnetosheath flow speed on the flanks of the magnetotail steadily exceeded the solar wind speed by 20 percent; (2) surface waves with approximately a 5-min period and very non-sinusoidal waveform were persistently present on the dawn magnetopause and waves of similar period were present in the dusk magnetosheath; and (3) the magnetotail ceased to flare at an antisunward distance of 15 R(sub E). We propose that the acceleration of the magnetosheath flow is achieved by magnetic tension in the draped field configuration for northward IMF and that the reduction of tail flaring is consistent with a decreased amount of open magnetic flux and a larger standoff distance of the subsolar magnetopause. Results of a three-dimensional magnetohydrodynamic simulation support this phenomenological model. |
| File Size | 2103454 |
| Page Count | 39 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19930015892 |
| Archival Resource Key | ark:/13960/t5n925g5p |
| Language | English |
| Publisher Date | 1992-09-15 |
| Access Restriction | Open |
| Subject Keyword | Geophysics Magnetic Flux Magnetohydrodynamics Magnetosheath Magnetopause Waveforms Oscillations Twilight Glow Space Plasmas Interplanetary Magnetic Fields Phenomenology International Sun Earth Explorer 2 International Sun Earth Explorer 1 Magnetic Fields Solar Wind Three Dimensional Models Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
