Blar i forfatter "Baumann, Carsten"

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    • Arecibo measurements of D-region electron densities during sunset and sunrise: implications for atmospheric composition 

      Baumann, Carsten; Kero, Antti; Raizada, Shikha; Rapp, Markus; Sulzer, Michael P.; Verronen, Pekka T.; Vierinen, Juha (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-08-02)
      Earth’s lower ionosphere is the region where terrestrial weather and space weather come together. Here, between 60 and 100 km altitude, solar radiation governs the diurnal cycle of the ionized species. This altitude range is also the place where nanometre-sized dust particles, recondensed from ablated meteoric material, exist and interact with free electrons and ions of the ionosphere. This ...

    • Dust sputtering within the inner heliosphere: a modelling study 

      Baumann, Carsten; Myrvang, Margaretha; Mann, Ingrid (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-08-03)
      The aim of this study is to investigate how sputtering by impacting solar wind particles influence the lifetime of dust particles in the inner heliosphere near the Sun.<p><p> We consider three typical dust materials: silicate, Fe<sub>0.4</sub>Mg<sub>0.6</sub>O and carbon and describe their sputtering yields based on atomic yields given by the Stopping and Range of Ions in Matter (SRIM) package. ...

    • Dust Trajectory Calculations in the Inner Heliosphere and Circumstellar Debris Disks 

      Mann, Ingrid; Stamm, Johann Immanuel; Czechowski, Andrzej; Baumann, Carsten; Myrvang, Margaretha; Li, Aigen (Conference object; Konferansebidrag, 2018)

    • Dust trajectory simulations around Sun, Vega, and Fomalhaut 

      Stamm, Johann Immanuel; Czechowski, Andrzej; Mann, Ingrid; Baumann, Carsten; Myrvang, Margaretha (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-06-20)
      <p><i>Context - </i>Vega and Fomalhaut display a thermal emission brightness that can possibly arise from hot dust near the stars, an inner extension of their planetary debris disks. There was brought up an idea that nm-sized dust particles are kept in the vicinity of the stars by electromagnetic forces. This resembles the trapping that model calculations show in the corotating magnetic field in the ...

    • Dynamics of Dust Particles near Sun, Vega and Fomalhaut 

      Stamm, Johann Immanuel; Baumann, Carsten; Czechowski, Andrzej; Mann, Ingrid; Myrvang, Margaretha (Conference object; Konferansebidrag, 2018)

    • The Fate of Nanodust near the Sun - Comparison of Sputtering and Sublimation lifetimes during CMEs 

      Baumann, Carsten; Myrvang, Margaretha; Stamm, Johann Immanuel; Mann, Ingrid (Conference object; Konferansebidrag, 2018)
      The dust environment in the inner Solar system has not been probed so far, but ESA’s Solar Orbiter (2020) and NASA’s Parker Solar Probe (2018) are about cross the inner solar system. From [1] we expect a layer of trapper Nanodust around the Sun. [2] investigated the interaction of grains with the Solar wind. But what is the dust’s fate when they are struck by a Coronal Mass Ejection (CME). Are they ...

    • Modelling the influence of meteoric smoke particles on artificial heating in the D-region 

      Myrvang, Margaretha; Baumann, Carsten; Mann, Ingrid (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-12-17)
      We investigate if the presence of meteoric smoke particles (MSPs) influences the electron temperature during artificial heating in the D-region. By transferring the energy of powerful high-frequency radio waves into thermal energy of electrons, artificial heating increases the electron temperature. Artificial heating depends on the height variation of electron density. The presence of MSPs can ...

    • Sputtering through coronal mass ejections and the fate of nanodust near the Sun 

      Baumann, Carsten; Stamm, Johann Immanuel; Myrvang, Margaretha; Mann, Ingrid; Aasmundveit, Jan Fredrik (Conference object; Konferansebidrag, 2018)

    • Temperature and thermal emission of cosmic dust in the vicinity of the Sun, Vega and Fomalhaut. 

      Myrvang, Margaretha; Baumann, Carsten; Mann, Ingrid; Stamm, Johann Immanuel (Conference object; Konferansebidrag, 2018)