University of Oulu

Sauvaud, J.-A., Delcourt, D., Parrot, M., Payan, D., Raita, T., & Penou, E. (2018). Low-altitude observations of recurrent short-lived keV ion microinjections inside the diffuse auroral zone. Journal of Geophysical Research: Space Physics, 123, 2054–2063.

Low-altitude observations of recurrent short-lived keV ion microinjections inside the diffuse auroral zone

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Author: Sauvaud, J.‐A.1; Delcourt, D.2; Parrot, M.3;
Organizations: 1Institut de Recherche en Astrophysique et Planétologie, Université de Toulouse, CNRS, UPS, CNES
2Laboratoire de Physique des Plasmas, Ecole Polytechnique, CNRS, Université Pierre et Marie Curie
3Laboratoire de Physique et Chimie de l'Environnement et de l'Espace, CNRS, Université d'Orléans
4Centre National d'Etudes Spatiales
5Sodankylä Geophysical Observatory, University of Oulu
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 2.2 MB)
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Language: English
Published: American Geophysical Union, 2018
Publish Date: 2018-05-15


The AMBRE experiment onboard the ocean topography mapper JASON‐3 aims at measuring the spacecraft potential as well as auroral particle precipitation using two top‐hat analyzers for electrons and ions in the 20 eV–28 keV energy range. The JASON‐3 spacecraft has a nearly circular orbit at an altitude of 1,336 km with an inclination of 66°, at times probing the equatorward part of the auroral oval in a nearly tangential manner upon leaving the outer radiation belt. In this region of space, during periods of enhanced geomagnetic activity with small or moderate storms, AMBRE detected recurrent “microinjections” of ions with energies in the 200 eV–28 keV range and which exhibit clear time‐of‐flight dispersion. Ray tracing using single trajectory computations suggests that these ions are launched from a source located in the 8,000–12,000 km altitudinal range and subsequently propagate downward toward the ionosphere. Such observations of quasiperiodic dispersed downflowing ions are new, and we argue that these structures could be produced by ion‐wave interactions at midaltitudes.

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Series: Journal of geophysical research. Space physics
ISSN: 2169-9380
ISSN-E: 2169-9402
ISSN-L: 2169-9380
Volume: 123
Issue: 3
Pages: 2054 - 2063
DOI: 10.1002/2017JA025075
Type of Publication: A1 Journal article – refereed
Field of Science: 115 Astronomy and space science
114 Physical sciences
Copyright information: © 2018. The Authors. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.