| タイトル | Response of the ionospheric convection pattern to a rotation of the interplanetary magnetic field on January 14, 1988 |
| 著者（英） | Hairston, M. R.; Cumnock, J. A.; Heelis, R. A. |
| 著者所属（英） | NASA Headquarters |
| 発行日 | 1992-12-01 |
| 言語 | eng |
| 内容記述 | Ionospheric convection signatures observed over the polar regions are provided by the DMSP F8 satellite. We consider five passes over the Southern summer Hemisphere during a time when the z component of the interplanetary magnetic field was stable and positive and the y component changed slowly from positive to negative. Large-scale regions of sunward flow are observed at very high latitudes consistent with a strong z component. When By and Bz are positive, but By is greater than Bz, strong evidence exists for dayside merging in a manner similar to that expected when Bz is negative. This signature is diminished as By decreases and becomes smaller than Bz, resulting in a four-cell convection pattern displaced toward the sunward side of the dawn-dusk meridian. In this case the sign of By affects the relative sizes of the two highest-latitude cells. In the Southern Hemisphere the duskside high-latitude cell is dominant for By positive and the dawnside high-latitude cell is dominant for By negative. The relative importance of possible electric field sources in the low-latitude boundary layer, the dayside cusp, and the lobe all need to be considered to adequately explain the observed evolution of the convection pattern. |
| NASA分類 | GEOPHYSICS |
| レポートNO | 93A21006 |
| 権利 | Copyright |
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