| タイトル | The quasiperpendicular environment of large magnetic pulses in Earth's quasiparallel foreshock - ISEE 1 and 2 observations |
| 著者（英） | Greenstadt, E. W.; Russell, C. T.; Farris, M. H.; Coroniti, F. V.; Moses, S. L. |
| 著者所属（英） | NASA Headquarters |
| 発行日 | 1993-07-23 |
| 言語 | eng |
| 内容記述 | ULF waves in Earth's foreshock cause the instantaneous angle theta-B(n) between the upstream magnetic field and the shock normal to deviate from its average value. Close to the quasi-parallel (Q-parallel) shock, the transverse components of the waves become so large that the orientation of the field to the normal becomes quasi-perpendicular (Q-perpendicular) during applicable phases of each wave cycle. Large upstream pulses of B were observed completely enclosed in excursions of Theta-B(n) into the Q-perpendicular range. A recent numerical simulation included Theta-B(n) among the parameters examined in Q-parallel runs, and described a similar coincidence as intrinsic to a stage in development of the reformation process of such shocks. Thus, the natural environment of the Q-perpendicular section of Earth's bow shock seems to include an identifiable class of enlarged magnetic pulses for which local Q-perpendicular geometry is a necessary association. |
| NASA分類 | GEOPHYSICS |
| レポートNO | 93A53263 |
| 権利 | Copyright |
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