Sökning: "h-alpha"

Hittade 5 uppsatser innehållade ordet h-alpha.

  1. 1. Mapping asymmetries of the H-alpha line profile in solar flares

    Kandidat-uppsats, Stockholms universitet/Institutionen för astronomi

    Författare :Veronika Borgström; [2019]
    Nyckelord :solar; flares; asymmetry; h-alpha;

    Sammanfattning : In this paper we analyze the small C1.5 class solar flare observed on June 30th 2013 by the Swedish Solar Telescope. LÄS MER

  3. 2. Investigating Gas Turbulence in Galactic Discs

    Master-uppsats, Lunds universitet/Astronomi - Genomgår omorganisation

    Författare :Timmy Ejdetjärn; [2019]
    Nyckelord :galaxies; gas; turbulence; interstellar medium; star formation; feedback; gravitational instability; local; high redshift; Physics and Astronomy;

    Sammanfattning : The interstellar medium of both local and distant disc galaxies is observed to be supersonically turbulent and the turbulent motion of the gas is thought to be important for galaxy formation and evolution, particularly as a key ingredient for star formation. Consequently, this generates a striking relation between the star formation rate (SFR) and gas velocity dispersion ($\sigma_{\rm g}$; a measurement on the level of turbulence). LÄS MER

  4. 3. Mapping asymmetries of the H-alpha line profile in solar flares

    Kandidat-uppsats, Stockholms universitet/Institutionen för astronomi

    Författare :Veronika Borgström; [2019]
    Nyckelord :Solar flares; asymmetry; bachelor;

    Sammanfattning : In this paper we analyze the small C1.5 class solar flare observed on June 30th 2013 by the Swedish Solar Telescope. LÄS MER

  5. 4. Plasma diagnostics for particle confinement studies in magnetic fusion devices

    Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Tillämpad kärnfysik

    Författare :Linus Hägg; [2018]
    Nyckelord :Interferometry; Interferometer; double color interferometer; two-color interferometer; Fusion; Plasma; Fusion plasma; Spectroscopy;

    Sammanfattning : This thesis investigates the performance and improves a double color interferometer setup, absolutely calibrates a line radiation Balmer H-alpha measurement setup, and uses measurements from both setups to estimate the particle confinement time of a plasma. The double colour interferometer at the magnetic confinement plasma device EXTRAP T2R measures the line integrated electron density of the plasma. LÄS MER

  7. 5. Photo-evaporation of Globulettes : Numerical hydrodynamic studies of photo-evaporating low-mass globules in the Rosette Nebula

    Uppsats för yrkesexamina på grundnivå, Institutionen för astronomi

    Författare :Andrej Kuutmann; [2007]
    Nyckelord :astronomi; astronomy; astrophysics;

    Sammanfattning : In this work, the long-term evolution of globulettes, low-mass globules found in H II regions, is studied through numerical hydrodynamic simulations. It has been proposed by Gahm et al. LÄS MER