The response of the large scale ionospheric convection pattern to changes in the IMF and substorms - Results from the SUNDIAL 1987 campaign

摘要: This paper reports multi-point observations of ionospheric convection made during the SUNDIAL 1987 campaign. Two specific intervals varying interplanetary magnetic field, which also include several substorms, have been identified for detailed study. The two differed considerably in both input energy from solar wind to magnetosphere prior substorm expansion phase onset and response phase. One can be represented by classical picture growth phase, recovery other, occurred an interval weak magnetosphere, was more complex, particular Observations earth's field midnight sector provide timing substorms allow separation effects due changes IMF substorms. primary effect a change positive B z negative is enhancement plasma flow magnitude. time each southward turning varies 15 minutes near 1800 MLT 30 2100 closer hour midnight. In instances, as increase following IMF. overall length similar, about 90 minutes, despite different prevailing conditions. Furthermore this somewhat longer than previous observations. During one consisted intensifications, there evidence that nightside reversal moved progressively earlier local times intensification