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Investigating wave data from the FAST satellite by reconstructing the wave distribution function
Umeå University, Faculty of Science and Technology, Physics.
2002 In: Journal of Geophysical Research, Vol. 107, doi:10.1029/2001/2001JA900154- p.Article in journal (Refereed) Published
Place, publisher, year, edition, pages
2002. Vol. 107, doi:10.1029/2001/2001JA900154- p.
Identifiers
URN: urn:nbn:se:umu:diva-4594OAI: oai:DiVA.org:umu-4594DiVA: diva2:143754
Available from: 2005-05-13 Created: 2005-05-13Bibliographically approved
In thesis
1. The importance of waves in space plasmas: Examples from the auroral region and the magnetopause
Open this publication in new window or tab >>The importance of waves in space plasmas: Examples from the auroral region and the magnetopause
2005 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis discusses the reasons for space exploration and space science. Space plasma physics is identified as an essential building block to understand the space environment and it is argued that observation and analysis of space plasma waves is an important approach.

Space plasma waves are the main actors in many important processes. So-called broadband waves are found responsible for much of the ion heating in the auroral region. We investigate the wave properties of broadband waves and show that they can be described as a mixture of electrostatic wave modes. In small regions void of cold electrons the broadband activity is found to be ion acoustic waves and these regions are also identified as acceleration regions. The identification of the wave modes includes reconstructions of the wave distribution function. The reconstruction technique allow us to determine the wave vector spectrum, which cannot be measured directly. The method is applied to other wave events and it is compared in some detail with a similar method.

Space plasma wave are also sensitive tools for investigations of both the fine-structure and the dynamics of space plasmas. Studies of whistler mode waves observed in the boundary layer on the magnetospheric side of the magnetopause reveal that the plasma is organized in tube-like structures moving with the plasma drift velocity. The perpendicular dimension of these tubes is of the order of the electron inertial length. We present evidence that each tube is linked to a reconnection site and argue that the high density of tube-like structures indicates patchy reconnection.

Place, publisher, year, edition, pages
Umeå: Fysik, 2005. 28 p.
Keyword
Space and plasma physics, Plasma waves, magnetospheric physics, magnetopause, auroral region, wave distribution function, space exploration, reconnection, current tubes, Rymd- och plasmafysik
National Category
Fusion, Plasma and Space Physics
Research subject
Space Physics
Identifiers
urn:nbn:se:umu:diva-538 (URN)91-7305-872-6 (ISBN)
Public defence
2005-06-03
Available from: 2005-05-13 Created: 2005-05-13Bibliographically approved

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CiteExportLink to record
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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