Sökning: "stoft"
Visar resultat 1 - 5 av 13 avhandlingar innehållade ordet stoft.
1. Dusty Globules and Globulettes
Sammanfattning : Interstellar gas and dust can condense into clouds of very different size, ranging from giant molecular cloud complexes to massive, isolated, dark cloudlets, called globules with a few solar masses.This thesis focuses on a new category of small globules, named globulettes. LÄS MER
2. Rosetta Observations of Plasma and Dust at Comet 67P
Sammanfattning : In-situ observations of cometary plasma are not made because they are easy. The historic ESA Rosetta mission was launched in 2004 and traversed space for ten years before arriving at comet 67P/Churyumov-Gerasimenko, which it studied in unprecedented detail for two years. LÄS MER
3. High-resolution meteor exploration with tristatic radar methods
Sammanfattning : A meteor observed with the naked eye is colloquially called a shooting star. The streak of light is generated by an extra-terrestrial particle, a meteoroid, entering the Earth’s atmosphere. The term meteor includes both luminosity detectable by optical means and ionization detectable by radar. LÄS MER
4. Radio meteors above the Arctic Circle : radiants, orbits and estimated magnitudes
Sammanfattning : This thesis presents results based on data collected with the 930 MHz EISCAT UHF radar system and three SKiYMet specular meteor radars. It describes in detail a method for meteoroid orbit calculation. The EISCAT UHF system comprises three identical 32 m parabolic antennae: one high-power transmitter/receiver and two remote receivers. LÄS MER
5. Om stjärnor omgivna av gas och stoft samt om fotometri i infrarött av kalla stjärnor : en betraktelse
Sammanfattning : .... LÄS MER