Blar i forfatter "Rochat, Sylvain"

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    • At the source of the polarisation of auroral emissions: experiments and modeling 

      Bosse, Léo; Lilensten, Jean; Gillet, Nicolas; Brogniez, Colette; Pujol, Olivier; Rochat, Sylvain; Delboulbé, Alain; Curaba, Stephane; Johnsen, Magnar Gullikstad (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-04-01)
      A polarised radiative transfer model (POMEROL) has been developed to compute the polarisation measured by a virtual instrument in a given nocturnal environment. This single-scattering model recreates real-world conditions (among them atmospheric and aerosol profiles, light sources with complex geometries at the ground and in the sky, terrain obstructions). It has been successfully tested at mid-latitudes ...

    • On the nightglow polarisation for space weather exploration 

      Bosse, Léo; Lilensten, Jean; Gillet, Nicolas; Rochat, Sylvain; Delboulbé, Alain; Curaba, Stephane; Roux, Alain; Magnard, Yves; Johnsen, Magnar Gullikstad; Løvhaug, Unni Pia; Amblard, Pierre-Olivier; Le Bihan, Nicolas; Nabon, Maxime; Marif, Hanane; Auriol, Frédérique; Noûs, Camille (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-07-28)
      We present here observations of the polarisation of four auroral lines in the auroral oval and in the polar cusp using a new ground polarimeter called <i>Petit Cru</i>. Our results confirm the already known polarisation of the red line, and show for the first time that the three other lines observed here (namely 557.7 nm, 391.4 nm and 427.8 nm) are polarised as well up to a few percent. We show that ...

    • The polarisation of auroral emissions: A tracer of the E region ionospheric currents 

      Bosse, Léo; Lilensten, Jean; Johnsen, Magnar Gullikstad; Gillet, Nicolas; Rochat, Sylvain; Delboulbé, Alain; Curaba, Stephane; Ogawa, Yasunobu; Derverchère, Philippe; Vauclair, Sébastien (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-05-20)
      It is now established that auroral emissions as measured from the ground are polarised. The question of the information given by this polarisation is still to be explored. This article shows the results of a coordinated campaign between an optical polarimeter and several ground-based instruments, including magnetometers, the EISCAT VHF radar, and complementary luminance meters in the visible ...