Sökning: "Lyman-alpha"

Hittade 5 uppsatser innehållade ordet Lyman-alpha.

  1. 1. Measuring the [C II]-to-H I connection in high-redshift absorption-selected galaxies

    Kandidat-uppsats, Lunds universitet/Astronomi - Genomgår omorganisation

    Författare :Gaurav Senthil Kumar; [2022]
    Nyckelord :QSO; Quasar; Black Hole; AGN; Active Galactic Nuclei; DLA; Damped Lyman Alpha; C II; [C II]; H I; Sightline; HST; X-shooter; Spectroscopy; Echelle Spectroscope; Hyperfine transition; Hyperfine; Physics and Astronomy;

    Sammanfattning : HI neutral gas is the basic building block of galaxies. It dictates the star formation rate and hence the metal enrichment rates within high redshift galaxies. HI neutral gas cannot be directly observed beyond z ≈ 0. LÄS MER

  3. 2. Ly-α Dayglow on Uranus : Radiative Transfer Modelling

    Master-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Författare :Jahangir Jazayeri; [2021]
    Nyckelord :Uranus; Lyman-alpha; Ly-α; resonant scattering; Rayleigh scattering; interplanetary medium; ultraviolet; hydrogen; methane; parameter study; limb brightening; Voyager 2; Ultraviolet Spectrometer;

    Sammanfattning : Uranus is one of the least explored planets in our solar system. Event though the Uranian Ly-α emission has been a subject of study for decades, there is not a consensus on the sources contribution to the total signal. LÄS MER

  4. 3. Europa's Lyman-Alpha Shadow on Jupiter

    Master-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Författare :Johan Ferm; [2020]
    Nyckelord :Europa moon ; Jupiter; water; plumes; Solar System; planets; satellites; hydrogen; Lyman-alpha; Europa måne ; Jupiter; vatten; plymer; solsystemet; skugga; planeter; satelliter; väte; Lyman-alpha;

    Sammanfattning : Europa is one of the most interesting satellites in the solar system in the search ofextra-terrestrial life, as it harbours an interior water ocean under its icy surface. Watervapour in Europa’s atmosphere has been previously observed, suggesting water plumeeruptions from the surface. LÄS MER

  5. 4. Europa's Hydrogen Corona in a Large Set of HST Lyman-Alpha Images

    Master-uppsats, Luleå tekniska universitet/Institutionen för system- och rymdteknik

    Författare :Sofia Bergman; [2017]
    Nyckelord :Europa; Jupiter; Atmospheric Physics; HST; STIS; Spectral Images; Hydrogen; Corona; Lyman-Alpha; Number Density; Albedo; Modelling;

    Sammanfattning : Far-ultraviolet (FUV) spectral images of Jupiter's moon Europa were obtained by the Space Telescope Imaging Spectrograph (STIS) on the Hubble Space Telescope (HST) on 20 occasions between the years 1999 and 2015. In this thesis these data are analyzed to look for Lyman-alpha emissions from a hydrogen corona. LÄS MER

  7. 5. Measurements of electric fields in a plasma by Stark mixing induced Lyman-α radiation

    Master-uppsats, Institutionen för fysik och astronomi

    Författare :Petter Ström; [2013]
    Nyckelord :Plasma diagnostic; electric field measurement; non-intrusive; Stark effect; Lyman-alpha; hyperfine structure; H 2s ; cesium vapour;

    Sammanfattning : This paper treats a non-intrusive method of measuring electric fields in plasmas and other sensitive or hostile environments. The method is based on the use of an atomic hydrogen beam prepared in the metastable fine structure quantum state 2s1/2. LÄS MER