The appearance of plasmaspheric plasma in the outer magnetosphere in association with the substorm growth phase

Short intrevals ( 10 cm{sup {minus}3}), cold (< 10 eV) plasmaspheric plasma are observed at synchronous orbit in association with the growth phase of geomagnetic substorms. The authors interpret the strong correlation between these phenomena in terms of the reconfiguration of the duskside/nightside magnetosphere during the growth phase of geomagnetic substorms. This reconfiguration moves plasmapheric plasma outward to synchronous orbit, occasionally even in the midnight region. 24 refs., 4 fig.