Electron energization by Alfven waves: Freja and sounding rocket observations
2000 (English)In: Physica scripta. T, ISSN 0281-1847, Vol. T84, 151-153 p.Article in journal (Refereed) Published
Recent sounding rockets observations highlight some space-time ambiguities in phenomena taking place in the auroral ionosphere, previously observed by the Freja spacecraft. Field aligned electron populations with energies from a few tens of eV to a few keV streaming through cold background plasma are usually observed in the auroral zone in association with strongly nonlinear electromagnetic perturbations. Simultaneous observations of bursty Langmuir emissions indicate the unstable character of these plasma distributions. A detailed analysis shows that the electromagnetic perturbations take the form of quasi-stationary nonlinear spatial structures related to inertial Alfven waves. We suggest that inhomogeneous altitude distribution of the parallel electric field of these structures due to ionospheric density gradientis responsible for the observed electron distributions.
Place, publisher, year, edition, pages
2000. Vol. T84, 151-153 p.
IdentifiersURN: urn:nbn:se:kth:diva-19696DOI: 10.1238/Physica.Topical.084a00151ISI: 000086560100034OAI: oai:DiVA.org:kth-19696DiVA: diva2:338388
QC 201005252010-08-102010-08-10Bibliographically approved