Blar i forfatter Artikler, rapporter og annet (EISCAT) "Häggström, I."

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    • The Extending of Observing Altitudes of Plasma and Ion Lines During Ionospheric Heating 

      Wu, Jun; Wu, Jian; Rietveld, Michael T; Häggström, I.; Xu, Zhengwen; Zhao, Haisheng (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-01-26)
      The ultrahigh-frequency observation during an ionospheric heating experiment on 11 March 2014 at the European Incoherent Scatter Scientific Association Tromsø site illustrated a remarkable extension of observing altitudes of the enhanced plasma line and the ion line, implying that the enhanced ion acoustic wave and Langmuir wave should satisfy the Bragg condition within the extending altitude range. ...

    • Infrasound - the cause of strong Polar Mesosphere Winter Echoes? 

      Rietveld, Michael T.; Kirkwood, S.; Chilson, P.; Belova, E.; Häggström, I.; Singer, W.; Dalin, P. (Journal article; Peer reviewed; Tidsskriftartikkel, 2006-03-23)
      The ESRAD 52-MHz and the EISCAT 224-MHz radars in northern Scandinavia observed thin layers of strongly enhanced radar echoes from the mesosphere (Polar Mesosphere Winter Echoes - PMWE) during a solar proton event in November 2004. Using the interferometric capabilities of ESRAD it was found that the scatterers responsible for PMWE show very high horizontal travel speeds, up to 500 ms-1 or more, and ...