Larry Kepko

TL;DR: Results demonstrate that substorms are likely initiated by tail reconnection, and are reported on simultaneous measurements in the magnetotail at multiple distances, at the time of substorm onset.

TL;DR: In this article, the authors show that upstream solar wind number density and dynamic pressure variations precede and drive compressional magnetic field variations at geosynchronous orbit, and that wave power spectra in both the solar wind and magnetosphere contain peaks at the same discrete frequencies.

TL;DR: In this article, the authors present six events in which both the time series and the spectral content of solar wind number density fluctuations and magnetospheric magnetic field observations were highly correlated for intervals ranging from a few to twelve hours.

TL;DR: In this article, the substorm current wedge was developed to explain the magnetic signatures observed on the ground and in geosynchronous orbit during substorm expansion, and new observations, including radar and low altitude spacecraft, MHD simulations, and theoretical considerations have tremendously ad-vanced our understanding of this system.

TL;DR: In this paper, the authors examined six near-Earth dipolarization events during which rapid flows were observed by Geotail at distances between 8 and 15 RE in the magnetotail.