Search for dissertations about: "importance of waves"

Showing result 1 - 5 of 87 swedish dissertations containing the words importance of waves.

2. 1. The importance of waves in space plasmas : Examples from the auroral region and the magnetopause

   Author : Gabriella Stenberg; Umeå universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Space and plasma physics; Plasma waves; magnetospheric physics; magnetopause; auroral region; wave distribution function; space exploration; reconnection; current tubes; Rymd- och plasmafysik; Space physics; Rymdfysik; rymdfysik; Space Physics;

   Abstract : 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. READ MORE

4. 2. The Klimontovich description of complex plasma systems : Low frequency electrostatic modes, spectral densities of fluctuations and collision integrals

   Author : Panagiotis Tolias; Lars Blomberg; Carmine Castaldo; KTH; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; complex plasmas; dusty plasmas; Klimontovich equations; kinetic theory; dust acoustic waves; collision integrals;

   Abstract : Plasmas seeded with solid particulates of nanometer to micron sizes (complex plasma systems) are a ubiquitous feature of intergalactic, interstellar and planetary environments but also of plasma processing applications or even fusion devices. Their novel aspects compared with ideal multi-component plasmas stem from (i) the large number of elementary charges residing on the grain surface, (ii) the variability of the charge over mass ratio of the dust component, (iii) the inherent openness and dissipative nature of such systems. READ MORE

5. 3. Influence of Geometry on Drift Waves in Tokamaks and Stellarators

   Author : Tariq Rafiq; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; ITG; local magnetic shear; linear instabilities; drift waves;

   Abstract : There is a general consensus that drift waves are responsible for a large amount of transport in fusion experiments and it is of importance to investigate their linear stability and nonlinear evolution. These instabilities have therefore been intensively investigated in tokamaks for the last few decades. READ MORE

6. 4. Cluster Observations and Theoretical Explanations of Broadband Waves in the Auroral Region

   Author : Marie Backrud; Jan-Erik Wahlund; Mats André; David Knudsen; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Space and plasma physics; ion acoustic waves; auroral region; anomalous resistivity; Cluster; Rymd- och plasmafysik; Space physics; Rymdfysik;

   Abstract : Broadband extremely low-frequency wave emissions below the ion plasma frequency have been observed by a number of spacecraft and rockets on auroral field lines. The importance of these broadband emissions for transverse ion heating and electron acceleration in the auroral regions is now reasonably well established. READ MORE

7. 5. Interaction of Hurricanes and Natural Coastal Features: Implications for Storm Damage Reduction

   Author : Ty Wamsley; Avdelningen för Teknisk vattenresurslära; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Louisiana; Barrier island; Vegetation; Flooding; Waves; Storm surge; Hurricanes; Mathematical modeling; Storm damage reduction;

   Abstract : It is generally acknowledged that wetlands and barrier islands can reduce surge and waves. However, while a general qualitative understanding of these interactions is available in the scientific literature, quantification of these interactions is lacking and has previously been based on limited data of relatively poor quality. READ MORE