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Electron-scale sheets of whistlers close to the magnetopause
Umeå University, Faculty of Science and Technology, Department of Physics.
Umeå University, Faculty of Science and Technology, Department of Physics.
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2005 (English)In: Annales Geophysicae, ISSN 0992-7689, E-ISSN 1432-0576, Vol. 23, no 12, 3715-3725 p.Article in journal (Refereed) Published
Abstract [en]

Whistler emissions close to the magnetopause on the magnetospheric side are investigated using the four Cluster spacecraft. The waves are found to be generated in thin (electron-scale) sheets moving with the plasma drift velocity. A feature in the electron data coincides with the waves; hot magnetospheric electrons disappear for a few satellite spins. This produces or enhances a temperature anisotropy, which is found to be responsible for the generation of the whistler mode waves. The high energy electrons are thought to be lost through the magnetopause and we suggest that the field lines, on which the waves are generated, are directly connected to a reconnection diffusion region at the magnetopause.

Place, publisher, year, edition, pages
Göttingen: Copernicus gesellschaft , 2005. Vol. 23, no 12, 3715-3725 p.
Keyword [en]
magnetospheric physics, magnetopause, cusp and boundary layers, space plasma physics, magnetic reconnection, waves and instabilities
National Category
Astronomy, Astrophysics and Cosmology Geology Meteorology and Atmospheric Sciences
Identifiers
URN: urn:nbn:se:umu:diva-4596DOI: 10.5194/angeo-23-3715-2005ISI: 000235008400013OAI: oai:DiVA.org:umu-4596DiVA: diva2:143756
Available from: 2005-05-13 Created: 2005-05-13 Last updated: 2017-12-14Bibliographically 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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