UCL Discovery
UCL home » Library Services » Electronic resources » UCL Discovery

Source of whistler emissions at the dayside magnetopause

Vaivads, A; Santolik, O; Stenberg, G; Andre, M; Owen, CJ; Canu, P; Dunlop, M; (2007) Source of whistler emissions at the dayside magnetopause. Geophysical Research Letters , 34 (9) , Article L09106. 10.1029/2006GL029195. Green open access

[thumbnail of 2006GL029195.pdf]
Preview
PDF
2006GL029195.pdf
Available under License : See the attached licence file.

Download (640kB)

Abstract

Observations of whistler emissions are common in the magnetosphere near the dayside magnetopause. We show that one of the major source regions for these emissions is magnetic field minima that form along magnetic flux tubes at high latitudes. Using multispacecraft Cluster observations we experimentally confirm for the first time the existence of the magnetic field minima at high latitudes and we show that whistler emissions propagate away from the magnetic field minima. The strongest whistler emissions are observed on the magnetospheric flux tubes that are newly opened due to the magnetic reconnection. These flux tubes still have a density of magnetospheric plasma, but part of the high energy magnetospheric electrons have already been lost from the flux tubes. The partial loss of high energy electrons most probably causes anisotropy in electron distributions at high energies which should be the source of whistler emissions. Whistler emissions on opened flux tubes disappear as soon as the plasma density of flux tubes increases due to the entering of magnetosheath ions. We speculate that whistler emissions can most probably be used to trace the dynamics of the first opened field lines and thus the dynamics of magnetic reconnection sites.

Type: Article
Title: Source of whistler emissions at the dayside magnetopause
Open access status: An open access version is available from UCL Discovery
DOI: 10.1029/2006GL029195
Publisher version: http://dx.doi.org/10.1029/2006GL029195
Language: English
Additional information: Copyright 2007 by the American Geophysical Union
Keywords: Reconnection, Chorus
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics
URI: https://discovery.ucl.ac.uk/id/eprint/153191
Downloads since deposit
134Downloads
Download activity - last month
Download activity - last 12 months
Downloads by country - last 12 months

Archive Staff Only

View Item View Item