Multi-point Observations and Modeling of Particle Injections

Tuesday, 16 December 2014
Michael G Henderson1, Steven Morley1, Geoffrey D Reeves1, Brian Larsen2, Ruth M Skoug3, Herbert O Funsten1 and Harlan E. Spence4, (1)Los Alamos National Laboratory, Los Alamos, NM, United States, (2)The New Mexico Consortium, Los Alamos, NM, United States, (3)Los Alamos Natl Lab, Los Alamos, NM, United States, (4)University of New Hampshire Main Campus, Space Science Center, Durham, NH, United States
Dispersionless and dispersed particle injections associated with substorms have been studied for many years based on observations acquired primarily at geosynchronous orbit. A general picture that has emerged is that particles are energized and rapidly transported/organized behind an "injection boundary" that penetrates closer to Earth in some magnetic local time sector (e.g. the so-called double-spiral injection boundary model). While this picture provides a very good description of injections at geosynchronous orbit, with the recent launchof the Van Allen Probes mission, we are now able to explore the evolution of injection signatures well inside of geosynchronous orbit at multiple locations as well. Here we report initial results of injection boundary modeling based on simultaneous multi-point measurements at both geosynchronous orbit (from the LANL/GEO spacecraft) and inside (from Van Allen Probes spacecraft). It is shown that many of the complex dispersion features observed in Van Allen Probes particle data are reproduced by the injection boundary model.