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Evolution of the Dispersionless Injection Boundary Associated with Substorms : Volume 23, Issue 3 (30/03/2005)

By Sarris, T.

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Book Id: WPLBN0003990872
Format Type: PDF Article :
File Size: Pages 8
Reproduction Date: 2015

Title: Evolution of the Dispersionless Injection Boundary Associated with Substorms : Volume 23, Issue 3 (30/03/2005)  
Author: Sarris, T.
Volume: Vol. 23, Issue 3
Language: English
Subject: Science, Annales, Geophysicae
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Li, X., & Sarris, T. (2005). Evolution of the Dispersionless Injection Boundary Associated with Substorms : Volume 23, Issue 3 (30/03/2005). Retrieved from

Description: Lab. for Atmospheric and Space Physics, Univ. of Colorado, Boulder, CO, USA. One manifestation of energetic particle acceleration during magnetospheric substorms is the sudden appearance of particle injections into the inner magnetosphere, often observed near geosynchronous orbit. Injections that show simultaneous flux increases in all energy ranges of a detector are called dispersionless injections, and are most often observed in a narrow region around local midnight. In these events it is assumed that the satellite is located close to or inside the region where acceleration and/or transport processes are taking place, called the injection region. We present a study of the location, extent and temporal evolution of the injection region, based on simulation results of a model of the expansion of the electric and magnetic fields associated with a substorm. The model simulates the fields during a substorm onset with an electric field and consistent magnetic field pulse that propagates towards the Earth with a decreasing speed. Our simulation shows that the dispersionless injection boundary can be considered coincident with the leading edge of the pulse field, which transports particles toward the Earth across a certain range of local time. Under the same model field, the dispersionless injection boundary shifts eastward for electrons and westward for protons, consistent with the observation results deduced from statistical analysis of multiple spacecraft measurements.

Evolution of the dispersionless injection boundary associated with substorms


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