Sökning: "Space"

Visar resultat 31 - 35 av 5017 avhandlingar innehållade ordet Space.

1. 31. The Auroral Large Imaging System : design, operation and scientific results

   Författare :Urban Brändström; Umeå universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Space and plasma physics; Aurora; Artificial airglow; HF-pump enhanced airglow; Multistation measurements; Polar Stratospheric clouds; Radio-Induced optical emissions; Spectroscopic imaging observations; Tomography; Rymd- och plasmafysik; Space physics; Rymdfysik; rymdfysik; Space Physics;

   Sammanfattning : The Auroral Large Imaging System (ALIS) was proposed in 1989 by Åke Steen as a joint Scandinavian ground-based nework of automated auroral imaging stations. The primary scientic objective was in the field of auroral physics, but it was soon realised that ALIS could be used in other fields, for example, studies of Polar Stratospheric Clouds (PSC), meteors, as well as other atmospheric phenomena. LÄS MER

3. 32. Interaction between Electromagnetic Waves and Localized Plasma Oscillations

   Författare :Jan-Ove Hall; Thomas Leyser; Jan Trulsen; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Space and plasma physics; space physics; plasma physics; radio waves; ionospheric modification; density depleations; field-aligned irregularities; lower hybrid solitary structures; lower hybrid cavities; Z mode waves; magnetosonic waves; scattering; mode conversion; Rymd- och plasmafysik; Space physics; Rymdfysik;

   Sammanfattning : This thesis treats interaction between electromagnetic waves and localized plasma oscillations. Two specific physical systems are considered, namely artificially excited magnetic field-aligned irregularities (striations) and naturally excited lower hybrid solitary structures (LHSS). LÄS MER

4. 33. The Polar Cusp and its Ionospheric footprint : Dynamics and Transients

   Författare :Frédéric Pitout; Ryoichi Fujii; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Space and plasma physics; Solar wind - magnetosphere - ionosphère interactions; polar ionosphere; Rymd- och plasmafysik; Space physics; Rymdfysik; Space Physics; rymdfysik;

   Sammanfattning : The magnetopause, the boundary layer between the solar wind and the Earth’s magnetosphere, is not closed as we have long thought. Transfers of energy, particles and momentum from the solar wind to the magnetosphere actually take place. LÄS MER

5. 34. Development and simulated observations of the Jovian Neutrals Analyzer

   Författare :Angèle Pontoni; Manabu Shimoyama; Mats Holmström; Ove Andersson; Andrew Yau; Umeå universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; space instrumentation; space physics; Ganymede; Jupiter; fysik; Physics; rymd- och plasmafysik; Space and Plasma Physics;

   Sammanfattning : This thesis deals with the development of the Jovian Neutrals Analyzer (JNA) for the Jupiter ICy moons Explorer (JUICE) mission to Jupiter, planned to launch in 2023. Jupiter, the largest planet in the Solar System, orbits the Sun at five times the distance from the Earth to the Sun, accompanied by dozens of moons, rings, and the largest object in the SolarSystem: the Jovian magnetosphere. LÄS MER

7. 35. Hubble Space Telescope Spectroscopy of Eta Carinae and Chi Lupi

   Författare :Torgil Zethson; Partikel- och kärnfysik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; magnetic and optical properties; supraconductors; electrical; Rymdteknik; kosmisk kemi; Condensed matter:electronic structure; rymdvetenskap; Astronomi; cosmic chemistry; space research; Astronomy; boron; isotope shifts; Chi Lupi; fluorescence; element abundances; emission lines; GHRS; strontium; STIS; Eta Carinae; spectroscopy; Hubble Space Telescope; supraledare; magnetiska och optiska ; magnetisk resonans; Space technology; spektroskopi; relaxation; magnetic resonance; egenskaper elektriska ; Kondenserade materiens egenskaper:elektronstruktur;

   Sammanfattning : Eta Carinae is a super-massive, super-luminous star. It is surrounded by a bipolar nebula, the "Homunculus", and several blobs of ejected gas which are the source of a complex emission-line spectrum. LÄS MER