Blar i forfatter Artikler, rapporter og annet (UB) "Ogawa, Yasunobu"

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    • Aspect angle sensitivity of pump-induced optical emissions at EISCAT 

      Kosch, Michael J.; Bryers, Carl; Rietveld, Michael T; Yeoman, Timothy K; Ogawa, Yasunobu (Journal article; Tidsskriftartikkel; Peer reviewed, 2014-12-04)
      We investigate the aspect angle sensitivity of the pump-induced artificial optical emissions in the ionosphere over the European Incoherent Scatter Scientific Association (EISCAT) high-frequency transmitter facility at Ramfjord, Norway, as a function of the pump beam launch angle relative to the magnetic field line direction. The highest intensity optical emissions occur when the pump beam pointing ...

    • 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 ...