FAST observations of preferentially accelerated He+ in association with auroral electromagnetic ion cyclotron waves

E. J. Lund, E. Möbius, L. Tang, L. M. Kistler, M. A. Popecki, D. M. Klumpar, W. K. Peterson, E. G. Shelley, B. Klecker, D. Hovestadt, M. Temerin, R. E. Ergun, J. P. McFadden, C. W. Carlson, F. S. Mozer, R. C. Elphic, R. J. Strangeway, C. A. Cattell, R. F. Pfaff

Research output: Contribution to journalArticlepeer-review

37 Scopus citations

Abstract

The TEAMS instrument on the FAST satellite has detected events in which He+ ions are resonantly accelerated perpendicular to the magnetic field to energies of several keV. The events occur in association with electromagnetic ion cyclotron (EMIC) waves and conic distributions of up to a few hundred eV in H+ and a few keV in O+. Concentrations of He+ can be significantly elevated during the events. Our interpretation is that the He+ ions are accelerated through a cyclotron resonance with the waves. This acceleration is similar to a proposed mechanism for selective ion acceleration in impulsive solar flares.

Original languageEnglish (US)
Pages (from-to)2049-2052
Number of pages4
JournalGeophysical Research Letters
Volume25
Issue number12
DOIs
StatePublished - 1998

Fingerprint Dive into the research topics of 'FAST observations of preferentially accelerated He<sup>+</sup> in association with auroral electromagnetic ion cyclotron waves'. Together they form a unique fingerprint.

Cite this