Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Alfvén Waves and Energy Transformation in Space Plasmas
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
2002 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis is focused on the role of Alfvén waves in the energy transformation and transport in the magnetosphere. Different aspects of Alfvén wave generation, propagation and dissipation are considered. The study involves analysis of experimental data from the Freja, Polar and Cluster spacecraft, as well as theoretical development. An overview of the linear theory of Alfvén waves is presented, including the effects of fnite parallel electron inertia and fnite ion gyroradius, and nonlinear theory is developed for large amplitude Alfvén solitons and structures. The methodology is presented for experimental identification of dispersive Alfvén waves in a frame moving with respect to the plasma, which facilitates the resolution of the space-time ambiguity in such measurements. Dispersive Alfvén waves are identified on field lines from the topside ionosphere up to the magnetopause and it is suggested they play an important role in magnetospheric physics. One of the processes where Alfvén waves are important is the establishment of the field aligned current system, which transports the energy from the reconnection regions at the magnetopause to the ionosphere, where a part of the energy is dissipated. The main mechanism for the dissipation in the top-side ionosphere is related to wave-particle interactions leading to particle energization/heating. An observed signature of such a process is the presence of parallel energetic electron bursts associated with dispersive Alfvén waves. The accelerated electrons (electron beams) are unstable with respect to the generation of high frequency plasma wave modes. Therefore this thesis also demonstrates an indirect coupling between low frequency Alfvén wave and high frequency oscillations.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis , 2002. , p. 50
Series
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 793
Keywords [en]
Space and plasma physics, Alfvén waves, particle acceleration, ionosphere, magnetopause, magnetic reconnection
Keywords [sv]
Rymd- och plasmafysik
National Category
Fusion, Plasma and Space Physics
Research subject
Space Physics
Identifiers
URN: urn:nbn:se:uu:diva-3264ISBN: 91-554-5505-0 (print)OAI: oai:DiVA.org:uu-3264DiVA, id: diva2:162283
Public defence
2003-01-31, Lecture Hall 10132 (Hägg), Ångström Laboratory, Uppsala, 10:15 (English)
Opponent
Available from: 2002-12-20 Created: 2002-12-20 Last updated: 2009-11-18Bibliographically approved

Open Access in DiVA

fulltext(1240 kB)1629 downloads
File information
File name FULLTEXT01.pdfFile size 1240 kBChecksum MD5
53bd289eef5457c1186d96eb4e0293da5b482b093101c606fdd8a105cd2664c7eee6b6f2
Type fulltextMimetype application/pdf
Buy this publication >>

By organisation
Swedish Institute of Space Physics, Uppsala Division
Fusion, Plasma and Space Physics

Search outside of DiVA

GoogleGoogle Scholar
Total: 1629 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

isbn
urn-nbn

Altmetric score

isbn
urn-nbn
Total: 1336 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf