Coordinates for Representing Radiation Belt Particle Flux

TitleCoordinates for Representing Radiation Belt Particle Flux
Publication TypeJournal Article
Year of Publication2018
AuthorsRoederer, JG, Lejosne, ène
JournalJournal of Geophysical Research: Space Physics
Date Published02/2018
Keywordsadiabatic coordinates; Radiation belts; Van Allen Probes
AbstractFifty years have passed since the parameter “L-star” was introduced in geomagnetically trapped particle dynamics. It is thus timely to review the use of adiabatic theory in present-day studies of the radiation belts, with the intention of helping to prevent common misinterpretations and the frequent confusion between concepts like “distance to the equatorial point of a field line,” McIlwain's L-value, and the trapped particle's adiabatic L* parameter. And too often do we miss in the recent literature a proper discussion of the extent to which some observed time and space signatures of particle flux could simply be due to changes in magnetospheric field, especially insofar as off-equatorial particles are concerned. We present a brief review on the history of radiation belt parameterization, some “recipes” on how to compute adiabatic parameters, and we illustrate our points with a real event in which magnetospheric disturbance is shown to adiabatically affect the particle fluxes measured onboard the Van Allen Probes.
Short TitleJ. Geophys. Res. Space Physics

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