Egil Leer

• Garcia, Odd Erik; Leer, Egil; Pecseli, Hans & Trulsen, Jan Karsten (2015). Magnetic field-aligned plasma currents in gravitational fields. Annales Geophysicae. ISSN 0992-7689. 33(3), s. 257–266. doi: 10.5194/angeo-33-257-2015. Fulltekst i vitenarkiv Vis sammendrag

  Analytical models are presented for currents along vertical magnetic field lines due to slow bulk electron motion in plasmas subject to a gravitational force. It is demonstrated that a general feature of this problem is a singularity in the plasma pressure force that develops at some finite altitude when a plasma that is initially in static equilibrium is set into slow motion. Classical fluid models thus do not allow general steady-state solutions for field-aligned currents. General solutions have to be non-stationary, varying on time scales of many periods of a plasma equivalent to the Brunt–Väisälä frequency. Except for very special choices of parameters, a steady-state solution exists only in an average sense. The conditions at large altitudes turn out to be extremely sensitive to even small changes in parameters at low altitudes. Low frequency fluctuations detected at large altitudes in the polar regions need not be caused by local low frequency instabilities, but merely reflect small fluctuations in conditions at low altitudes.

• Janse, Åse Marit; Lie-Svendsen, Øystein & Leer, Egil (2007). Solar wind originating in funnels: fast or slow? Astronomy and Astrophysics (A & A). ISSN 0004-6361. 474, s. 997–1013. doi: 10.1051/20066311. Fulltekst i vitenarkiv
• Lie-Svendsen, Øystein & Leer, Egil (2006). The Impact of Solar Eruptions on the Upper Chromosphere, Transition Region, and Corona. The Astrophysical Journal (ApJ). ISSN 0004-637X. 643, s. 1286–1303. doi: 10.1086/501432. Fulltekst i vitenarkiv
• Janse, Åse Marit; Lie-Svendsen, Øystein & Leer, Egil (2006). Improved gyrotropic transport equations for fully ionized magnetized gases: modelling the solar wind. Physica Scripta. ISSN 0031-8949. T122, s. 66–78. doi: 10.1088/0031-8949/2006/T122/01. Fulltekst i vitenarkiv
• Killie, Mari Anne; Lie-Svendsen, Øystein & Leer, Egil (2005). The Helium Abundance of Quiescent Coronal Loops. The Astrophysical Journal (ApJ). ISSN 0004-637X. 632, s. L155–L158. Fulltekst i vitenarkiv
• Janse, Åse Marit; Lie-Svendsen, Øystein & Leer, Egil (2005). Modeling helium in the solar wind with new gyrotropic transport equations. ESA SP. ISSN 0379-6566. s. 487–490. Fulltekst i vitenarkiv
• Killie, Mari Anne; Lie-Svendsen, Øystein & Leer, Egil (2005). Modeling Helium in Closed Coronal Structures. ESA SP. ISSN 0379-6566. s. 147–152. Fulltekst i vitenarkiv
• Janse, Åse Marit; Lie-Svendsen, Øystein & Leer, Egil (2005). Describing the flow of fully ionized, magnetized gases: improved gyrotropic transport equations. Journal of Plasma Physics. ISSN 0022-3778. 71(5), s. 611–629. doi: 10.1017/S0022377804003393. Fulltekst i vitenarkiv
• Endeve, Eirik; Lie-Svendsen, Øystein; Hansteen, Viggo & Leer, Egil (2005). Release of Helium from Closed-Field Regions of the Sun. The Astrophysical Journal (ApJ). ISSN 0004-637X. 624, s. 402–413. Fulltekst i vitenarkiv
• Killie, Mari Anne; Janse, Åse Marit; Lie-Svendsen, Øystein & Leer, Egil (2004). Improved transport equations for fully ionized gases. The Astrophysical Journal (ApJ). ISSN 0004-637X. 604, s. 842–849. Fulltekst i vitenarkiv
• Endeve, Eirik; Holzer, T.E. & Leer, Egil (2004). Helmet streamers gone unstable: Two-Fluid Magnetohydrodynamic Models of the Solar Corona. The Astrophysical Journal (ApJ). ISSN 0004-637X. 603, s. 307–307. Fulltekst i vitenarkiv
• Endeve, Eirik; Leer, Egil & Holzer, T.E. (2003). Two-dimensional Magnetohydrodynamic Models of the Solar Corona: Mass Loss from the Streamer Belt. The Astrophysical Journal (ApJ). ISSN 0004-637X. 589, s. 1040–1053. Fulltekst i vitenarkiv
• Lie-Svendsen, Øystein; Hansteen, Viggo & Leer, Egil (2003). Helium Abundance in the Corona and Solar Wind: Gyrotropic Modeling from the Chromosphere to 1 AU. The Astrophysical Journal (ApJ). ISSN 0004-637X. 596(1), s. 621–645. Fulltekst i vitenarkiv
• Lie-Svendsen, Øystein; Hansteen, Viggo; Leer, Egil & Holzer, T.E. (2002). The effect of transition region heating on the solar wind from coronal holes. The Astrophysical Journal (ApJ). ISSN 0004-637X. 566, s. 562–576. Fulltekst i vitenarkiv
• Endeve, Eirik & Leer, Egil (2001). Coronal heating and solar wind acceleration : gyrotropic electron-proton solar wind. Solar Physics. ISSN 0038-0938. 200, s. 235–250. Fulltekst i vitenarkiv
• Lie-Svendsen, Øystein; Leer, Egil & Hansteen, Viggo (2001). A 16-moment solar wind model: from the chromosphere to 1 AU. Journal of Geophysical Research (JGR). ISSN 0148-0227. 106(A5), s. 8217–8232. Fulltekst i vitenarkiv
• Lie-Svendsen, Øystein & Leer, Egil (2000). The electron velocity distribution in the high-speed solar wind: modeling the effects of protons. Journal of Geophysical Research (JGR). ISSN 0148-0227. 105(A1), s. 35–46. Fulltekst i vitenarkiv
• Leer, Egil & Marsch, E. (1999). Working Group I report: solar wind models from the sun to 1 AU: contraints by "in situ" and remote sensing measurements. Space Science Reviews. ISSN 0038-6308. 87, s. 67–77. Fulltekst i vitenarkiv
• Lie-Svendsen, Øystein & Leer, Egil (1999). Electron heat conduction in the solar transition region: validity of the classical description. The Astrophysical Journal (ApJ). ISSN 0004-637X. s. 1056–1065. Fulltekst i vitenarkiv
• Olsen, E.L. & Leer, Egil (1999). A study of solar wind acceleration based on gyro-tropic transport equations. Journal of Geophysical Research (JGR). ISSN 0148-0227. 104(A5), s. 9963–9973. Fulltekst i vitenarkiv

Se alle arbeider i NVA

• Leer, Egil (2009). Populærforedrag. Fulltekst i vitenarkiv
• Leer, Egil (2009). Intervju om IBEX-prosjektet. [Radio]. NRK P2 "Verdt å vite". Fulltekst i vitenarkiv
• Janse, Åse Marit; Lie-Svendsen, Øystein & Leer, Egil (2005). Modeling the solar wind with new transport equations. Fulltekst i vitenarkiv
• Killie, Mari Anne; Lie-Svendsen, Øystein & Leer, Egil (2005). Modeling Helium in Closed Coronal Structures. Fulltekst i vitenarkiv
• Janse, Åse Marit; Lie-Svendsen, Øystein & Leer, Egil (2004). Gyrotropic transport equations for a magnetized, fully ionized gas. Fulltekst i vitenarkiv
• Janse, Åse Marit; Lie-Svendsen, Øystein & Leer, Egil (2004). Transport equations for a magnetized, fully ionized gas. Fulltekst i vitenarkiv
• Bogdan, T.J.; Carlsson, Mats; Hansteen, Viggo; Heggland, Lars; Leer, Egil & Mcmurry, Andrew David [Vis alle 7 forfattere av denne artikkelen] (2004). Mode Conversion in Magneto-Atmospheres. Fulltekst i vitenarkiv
• Killie, Mari Anne; Janse, Åse Marit; Lie-Svendsen, Øystein & Leer, Egil (2004). Improved Transport Equations For Fully Ionized Gases. Fulltekst i vitenarkiv
• Lie-Svendsen, Øystein; Hansteen, Viggo & Leer, Egil (2001). Coupling between chromosphere and corona: why it matters for the solar wind. Fulltekst i vitenarkiv
• Leer, Egil (2001). Solar wind: theory. I Murdin, Paul (Red.), Encyclopedia of astronomy and astrophysics. IOP Publishing, Bristol ; Nature Publishing Group, London. ISSN 9780333750889. s. 2882–2886. Fulltekst i vitenarkiv
• Leer, Egil (2000). Solstormer og romvær. Astronomi. ISSN 0802-7587. 30(4), s. 16–18. Fulltekst i vitenarkiv
• Lemstad, Frank & Leer, Egil (2000). Romvær til besvær. Astronomi. ISSN 0802-7587. 30(4), s. 20–23. Fulltekst i vitenarkiv
• Hansteen, Viggo; Leer, Egil & Lie-Svendsen, Øystein (1999). Advances in modelling the fast solar wind. Fulltekst i vitenarkiv
• Hansteen, Viggo; Leer, Egil & Holzer, T.E. (1999). The origin of the high speed solar wind. Fulltekst i vitenarkiv

Se alle arbeider i NVA