Sökning: "collisionless shock"

Hittade 5 uppsatser innehållade orden collisionless shock.

  1. 1. Identifying Fundamental Characteristics of Shock Nonstationarity using MMS Measurements : Identifying and Distinguishing Non-stationary Behaviour Through the Magnetic Field Gradient in Quasi-perpendicular Shocks

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

    Författare :Hannah Wik; [2023]
    Nyckelord :Space; Space Plasma Physics; Collisionless Shocks; MMS; Non-stationarity; Shock Reformation; Rippling; Bow Shock; Solar Wind; Rymd; Rymdfysik; Kollisionsfria chocker; MMS; Icke-stationär; Reformation; Bogchock; Solvind;

    Sammanfattning : Collisionless shocks are widespread phenomena in the universe, and understanding the mechanisms behind their energy dissipation, with a rare number of collisions between particles, remains a significant unresolved question. The Earth’s bow shock provides an excellent opportunity to study this phenomena in situ. LÄS MER

  3. 2. Statistics of Electric and Magnetic Fields at the Earth’s Bow Shock

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

    Författare :Tsz-Kiu Wong-Chan; [2023]
    Nyckelord :MMS; Earth’s bow shock; Collisionless shocks; Correlation study; statistics; Space; Space plasma physics; MMS; Jordens bogchock; Kollisionsfria chocker; Korrelationsstudie; Statistik; Rymd; Rymdplasmafysik;

    Sammanfattning : The interaction between the solar wind and Earth’s magnetic field creates the Earth’s bow shock. It is an ideal region for space probes like MMS, THEMIS or Clusters to study the collisionless shock phenomenon in space plasma. LÄS MER

  4. 3. Using satellite data to calculate entropy of electrons at collisionless shocks

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

    Författare :Sofie Berglund; Alice Wallner; [2022]
    Nyckelord :entropy; electrons; plasma; Earth’s bow shock; magnetic field; collisionless shock; plasma beta; Alfv´en Mach number; MMS; NASA; satellite; IRF;

    Sammanfattning : The solar wind is a supersonic flow of protons and electrons emitted in all directions from the sun. As the supersonic solar wind encounters Earth’s magnetic field, it creates the Earth’s bow shock, which increases the kinetic entropy of electrons passing through it. LÄS MER

  5. 4. Electron heating in collisionless shocks observed by the MMS spacecraft

    Master-uppsats, Luleå tekniska universitet/Rymdteknik

    Författare :Martin Svensson; [2018]
    Nyckelord :shocks; MMS; electron; heating; gradient; quasi-perpendicular; scaling; plasma; space;

    Sammanfattning : Shock waves are ubiquitous in space and astrophysics. Shocks transform directed particle flow energy into thermal energy. As the major part of space is a collisionless medium, shocks in space physics arises through wave-particle interactions with the magnetic field as the main contributor.The heating processes are scale dependent. LÄS MER

  7. 5. The formation of the ion seed population at quasi-parallel shocks in space plasma

    Master-uppsats, Uppsala universitet/Rymd- och plasmafysik; Uppsala universitet/Institutet för rymdfysik, Uppsalaavdelningen

    Författare :Andreas Johlander; [2014]
    Nyckelord :;

    Sammanfattning : Collisionless shocks in space plasmas are known to be capable of accelerating particles to very high energies. Particles are accelerated through a process called Fermi acceleration. However, this process can only act on particles with higher than thermal (suprathermal) energies. LÄS MER