Sökning: "heliocentric"

Visar resultat 1 - 5 av 6 uppsatser innehållade ordet heliocentric.

  1. 1. Improving the understanding of photoelectron currents on Solar Orbiter : Utilizing theory and empirical measurements

    Kandidat-uppsats, Uppsala universitet/Institutet för rymdfysik, Uppsalaavdelningen

    Författare :Melker Marminge; [2023]
    Nyckelord :Solar Orbiter; Photoelectric Currents; Photoelectric Effect; Thermal Bending; Outgassing; Thermionic Emission; Numerical Approximation; Physical Modeling;

    Sammanfattning : Spacecraft experience electric currents on conductive materials exposed to sunlight, which introduces noise in scientific data. These currents are mainly due to the photoelectric effect and should therefore be proportional to the inverse square heliocentric distance. LÄS MER

  3. 2. The Metallicity Structure of the Milky Way Halo II : Characterising the distant halo substructure

    Master-uppsats, Uppsala universitet/Observationell astrofysik

    Författare :Amanda Byström; [2022]
    Nyckelord :Milky Way; Galactic archaeology; halo; photometric metallicities; stellar catalogue; Gaia-Enceladus-Sausage; Sagittarius; Pristine survey; metallicity; Gaia mission;

    Sammanfattning : The Milky Way galaxy, like all spiral galaxies, is surrounded by a roughly spherical distribution of stars called the halo. The halo was largely formed when the galaxy merged with smaller galaxies. LÄS MER

  4. 3. Multiple fly-by for interplanetary missions

    Master-uppsats, Luleå tekniska universitet/Rymdteknik

    Författare :Javier Chivite Sierra; [2021]
    Nyckelord :;

    Sammanfattning : Current state-of-the-art of propulsion system for space vehicles does not allow to deliver therequired payload for the mission to all bodies in the Solar System. Therefore, alternatives havebeen developed to reach those bodies without having the necessary technology. LÄS MER

  5. 4. Natt blir till Dag : En systematisk litteraturstudie om unga elevers uppfattning och utveckling av deras teorier om fenomenet dag och natt

    Uppsats för yrkesexamina på grundnivå, Linköpings universitet/Avdelningen för lärande, estetik och naturvetenskap; Linköpings universitet/Utbildningsvetenskap

    Författare :Petra Varblane; Love Eriksson; [2020]
    Nyckelord :;

    Sammanfattning : Previous research show that young children’s perceptions of the day/night cycle is based on everyday experiences and are therefore often inaccurate, such as the belief that the earth is flat or that the Moon is equal to night whereas the Sun equals day and disappears behind mountains during night. The following synthesis maps out common misperceptions about, and what characterizes young pupil’s theories about the day/night cycle and furthermore what role education comes to play in regard of developing these misconceptions. LÄS MER

  7. 5. A kinetic perspective of electron trapping near a weakly outgassing comet

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

    Författare :Chaitanya Prasad Sishtla; [2019]
    Nyckelord :;

    Sammanfattning : The European Space Agency’s Rosetta spacecraft followed the comet 67P/Churyumov-Gerasimenko from August 2014 to September 2016, providingobservations of the comet ionosphere at varying heliocentric distances. Measurementsfrom the Rosetta mission have shown a multitude of non-thermalelectron distributions in the cometary environment, challenging the previouslyassumed origin and plasma interaction mechanisms near a cometary nucleus. LÄS MER