Magnetospheric responses to sudden and quasiperiodic solar wind variations

摘要: [1] On April 13 (day 103), 2001, 0700–1400 UT, the Polar satellite experienced different plasma regimes (i.e., magnetosphere, magnetosheath, and solar wind) because of wind dynamic pressure variations its high orbital inclination near subsolar magnetopause meridian. When was in quasiperiodic spacecraft potential (SP) variations, corresponding to density with a recurrence time ∼3–10 min were observed. Using simultaneous observations, it confirmed that magnetosheath SP inherent wind. We observed an almost one-to-one correspondence between geomagnetic field perturbations at lower latitudes (L = 1.1–2.8) on nightside. At higher 2.9–6.1) dayside, however, are more complicated than variations. This suggests if magnetospheric produced by external source (solar wind/magnetosheath variations) deeply penetrate into lower-latitude data nightside important monitor In addition, we radial electric oscillations excited nearly simultaneously magnetic enhancement, associated sudden increase pressure, when magnetosphere. These may be considered as transient standing Alfven waves externally applied changes reported previous studies.