Blar i forfatter "Lamy, Hervé"

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    • Measurement of the polarisation in the auroral N2+ 427.8 nm band 

      Barthélemy, Mathieu; Lamy, Hervé; Vialatte, Anne; Johnsen, Magnar Gullikstad; Cessateur, G; Zaourar, N (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-07-16)
      In this paper, we provide for the first time polarisation measurements of the <i>N</i><sup>+</sup><sub>2</sub> band at 427.8 nm performed with Premier Cru, a dedicated spectropolarimeter to investigate the polarisation of auroral emission lines between 400 and 700 nm. Details about the instrument, the observing conditions and the data analysis procedure are provided. Results obtained during three ...

    • Reconstruction of electron precipitation spectra at the top of the upper atmosphere using 427.8 nm auroral images 

      Robert, Elisa; Barthélemy, Mathieu; Cessateur, Gaël; Woelfflé, Angélique; Lamy, Hervé; Bouriat, Simon; Johnsen, Magnar Gullikstad; Brändström, Urban; biree, lionel (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-12-13)
      We present an innovative method to reconstruct the characteristics of precipitated electrons in auroral regions from optical measurements. This method is based on an optimization implemented between numerical simulations of the Transsolo code and tomographic maps made from the Auroral Large Imaging System (ALIS) network. We focus on the Volume Emission Rate (VER) of the blue line 1NG 427.8 nm, which ...