Blar i forfatter Universitetsbiblioteket "Takahashi, Toru"

Viser treff 1-2 av 2

    • A statistical study of convective and dynamic instabilities in the polar upper mesosphere above Tromsø 

      Nozawa, Satonori; Saito, Norihito; Kawahara, Takuya D.; Wada, Satoshi; Tsuda, Takuo T.; Maeda, S; Takahashi, Toru; Fujiwara, Hitoshi; Narayanan, V L; Kawabata, T; Johnsen, Magnar Gullikstad (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-02-15)
      We have studied the convective (or static) and dynamic instabilities between 80 and 100 km above Tromsø (69.6° N, 19.2° E) using temperature and wind data of 6 min and 1 km resolutions primarily almost over a solar cycle obtained with the sodium lidar at Tromsø. First, we have calculated Brunt–Väisälä frequency (N) for 339 nights obtained from October 2010 to December 2019, and the Richardson ...

    • Suppression of ionospheric irregularity due to auroral particle impact 

      Takahashi, Toru; Spicher, Andres; Di Mare, Francesca; Rowland, Douglas E.; Pfaff, Robert F.; Collier, Michael R.; Clausen, Lasse; Moen, Jøran Idar (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-12-16)
      The VISIONS-2 35.039 sounding rocket was launched from Ny-Ålesund, Svalbard, on 7 December 2018 at 11:06 UT, and traveled overhead of the cusp aurora. The payload reached an apogee of 806.6 km and provided measurements of the electric field (E) and electron density (N<sub>e</sub> ) with a high sampling rate of 6,250 Hz. The high-sampling-data make it possible to estimate the horizontal structure ...