Hisao Takahashi

• Abstract

  This project is aimed at studying the dynamics and photochemistry of the upper atmosphere, mainly in the 70 to 120 km height region. Studies will include global change in the Earth's upper atmosphere; planetary waves; internal gravity waves; atmospheric tides; sporadic sodium layers and the climatology of the stratosphere, mesosphere and lower thermosphere. Experimental work will include …

  Study of the low-latitude upper atmosphere in Brazil, AP.TEM
• Evidence for planetary wave oscillation of the upper atmosphere airglow emissions observed from the equatorial region., AR.EXT
• Predominant diurnal mode oscillation of the equatorial upper-mesospheric airglow emissions., AR.EXT

(Only some records are available in English at this moment)

• Abstract

  Based on the ray tracing technique developed in this institute during the graduate course, a model for gravity waves propagation in the atmosphere has been proposed. The model is going to use wind measurements by meteor radars and Fabry-Perot interferometers, and temperature data from the TIMED/SABER satellite. In order to validate the model, gravity waves parameters, which were observed …

  REGIONAL ATMOSPHERIC GRAVITY WAVE PROPAGATION MODEL, BP.PD

• Abstract

  Coupling between the ionospheric plasma bubbles and atmospheric gravity waves has been an important issue for investigation of the ionospheric irregularities and plasma bubble seeding and development. The plasma bubbles occur in the equatorial ionosphere and affect not only radio telecommunications but also ground positioning system by GNSS satellites. Today, this is an important theme in…

  Study on coupling of the mesosphere and ionosphere in the equatorial region by means of airglow imaging and ionospheric sounding, BP.DR