<i>Article:</i> Heating of beam ions by ion acoustic waves

<i>Article:</i> Heating of beam ions by ion acoustic waves

Satellite measurements show that ion beams above the auroral acceleration region are heated to hundreds of eV in a direction perpendicular to the magnetic field. We show that ion acoustic waves may be responsible for much of this heating. Even in the absence of a positive slope in the velocity d...

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Main Authors: A. Vaivads, K. Rönnmark, T. Oscarsson, M. André
Format: Article
Language:English
Published: Copernicus Publications 1998-04-01
Series:Annales Geophysicae
Online Access:https://www.ann-geophys.net/16/403/1998/angeo-16-403-1998.pdf
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spelling doaj-9061566c831b452dbfb578ea486ffa4e2020-11-24T20:56:50ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05761998-04-011640341210.1007/s00585-998-0403-4<i>Article:</i> Heating of beam ions by ion acoustic wavesA. Vaivads0K. Rönnmark1T. Oscarsson2M. André3Swedish Institute of Space Physics, University of Ume&#x00E5; , S-901 87 UME&#x00C5; , SwedenSwedish Institute of Space Physics, University of Ume&#x00E5; , S-901 87 UME&#x00C5; , SwedenSwedish Institute of Space Physics, University of Ume&#x00E5; , S-901 87 UME&#x00C5; , SwedenSwedish Institute of Space Physics, University of Ume&#x00E5; , S-901 87 UME&#x00C5; , SwedenSatellite measurements show that ion beams above the auroral acceleration region are heated to hundreds of eV in a direction perpendicular to the magnetic field. We show that ion acoustic waves may be responsible for much of this heating. Even in the absence of a positive slope in the velocity distribution of the beam ions, ion acoustic waves can be generated by a fan instability. We present analytical estimates of the wave growth rate and ion beam heating rate. These estimates, which are confirmed by particle simulations, indicate that the perpendicular temperature of the beam ions will increase by 30 eV/s, or by 1 eV in 20–25 km. From the simulations we also conclude that the heating saturates at a perpendicular temperature around 200 eV, which is consistent with observations.<br><br><b>Key words.</b> Ionosphere (wave-particle interactions) · Magnetospheric Physics (plasma waves and instabilities) · Space plasma physics (wave-particle interactions).</p>https://www.ann-geophys.net/16/403/1998/angeo-16-403-1998.pdf
collection DOAJ
language English
format Article
sources DOAJ
author A. Vaivads
K. Rönnmark
T. Oscarsson
M. André
spellingShingle A. Vaivads
K. Rönnmark
T. Oscarsson
M. André
<i>Article:</i> Heating of beam ions by ion acoustic waves
Annales Geophysicae
author_facet A. Vaivads
K. Rönnmark
T. Oscarsson
M. André
author_sort A. Vaivads
title <i>Article:</i> Heating of beam ions by ion acoustic waves
title_short <i>Article:</i> Heating of beam ions by ion acoustic waves
title_full <i>Article:</i> Heating of beam ions by ion acoustic waves
title_fullStr <i>Article:</i> Heating of beam ions by ion acoustic waves
title_full_unstemmed <i>Article:</i> Heating of beam ions by ion acoustic waves
title_sort <i>article:</i> heating of beam ions by ion acoustic waves
publisher Copernicus Publications
series Annales Geophysicae
issn 0992-7689
1432-0576
publishDate 1998-04-01
description Satellite measurements show that ion beams above the auroral acceleration region are heated to hundreds of eV in a direction perpendicular to the magnetic field. We show that ion acoustic waves may be responsible for much of this heating. Even in the absence of a positive slope in the velocity distribution of the beam ions, ion acoustic waves can be generated by a fan instability. We present analytical estimates of the wave growth rate and ion beam heating rate. These estimates, which are confirmed by particle simulations, indicate that the perpendicular temperature of the beam ions will increase by 30 eV/s, or by 1 eV in 20–25 km. From the simulations we also conclude that the heating saturates at a perpendicular temperature around 200 eV, which is consistent with observations.<br><br><b>Key words.</b> Ionosphere (wave-particle interactions) · Magnetospheric Physics (plasma waves and instabilities) · Space plasma physics (wave-particle interactions).</p>
url https://www.ann-geophys.net/16/403/1998/angeo-16-403-1998.pdf
work_keys_str_mv AT avaivads iarticleiheatingofbeamionsbyionacousticwaves
AT kronnmark iarticleiheatingofbeamionsbyionacousticwaves
AT toscarsson iarticleiheatingofbeamionsbyionacousticwaves
AT mandre iarticleiheatingofbeamionsbyionacousticwaves
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