Sökning: "polar mesospheric clouds"
Visar resultat 1 - 5 av 6 avhandlingar innehållade orden polar mesospheric clouds.
1. Mesospheric measurements using microwave spectroscopy
Sammanfattning : The mesosphere is an altitude region of the atmosphere, covering altitudes between about 50 km to 100 km. Improved understanding of this area of the atmosphere offers possibilities of increasing the accuracy of weather forecast and climate models. LÄS MER
2. Tomographic views of the middle atmosphere from a satellite platform
Sammanfattning : The middle atmosphere is a very important part of the Earth system. Until recently, we did not realize the importance of the structure of this vaporous shell and of the fundamental role it plays in both creating and sustaining life on the planet. LÄS MER
3. Investigation of Polar Mesosphere Summer Echoes in Northern Scandinavia
Sammanfattning : This PhD thesis deals with phenomena which are closely related to the unique thermal structure of the polar summer mesosphere, namely Polar Mesosphere Summer Echoes (PMSE). PMSE are strong radar echoes commonly observed by VHF MST radars from thin layers in the 80-90 km altitude interval at high latitudes during summer. LÄS MER
4. Multi-satellite views on mesospheric microphysics and dynamics
Sammanfattning : Atmospheric gravity waves of different scales and origins strongly modulate the wind field and temperature structure of the higher parts of the atmosphere. Direct and continuous measurements of these processes are particularly complicated in the mesosphere at about 50 to 100 km height due to the remote location of this region. LÄS MER
5. Rocket-borne in situ measurements in the middle atmosphere
Sammanfattning : The Earth's mesosphere and lower thermosphere in the altitude range 50-130 km is a fascinating part of our atmosphere. Complex interactions between radiative, dynamical, microphysical and chemical processes give rise to several prominent phenomena, many of those centred around the mesopause region (80-100 km). LÄS MER