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Volume 51 Supplement 7-8

Special Issue: Dynamics and Structure of the Mesopause Region (DYSMER)

Coordinated observations of the dynamics and coupling processes of mesosphere and lower thermosphere winds with MF radars at the middle-high latitude


The Communications Research Laboratory (CRL) has operated the Wakkanai MF radar since September of 1996, and Yamagawa MF radar since August of 1994. Recent observation results on variations of mean wind, wind spectra and diurnal wind oscillations during a strong eastward wind, comparison experiments with the MU radar and rockets, and D-region electron density measurements by MF radar are summarized briefly. The spectra comparison of two MF radar observations show a high degree of spatial and temporal variability in a winter mesosphere in Northern and Southern Japan. Differences of mean wind in 1997 between both sites are shown for the periods of solstices and equinoxes. It is suggested that the propagation of the diurnal tide from the mesosphere into the dynamo region is disturbed by the sudden enhancements of the strong eastward wind.


  1. Bilitza, D. T., The E- and D-region in IRI, Adv. Space Res., 21, 871–874, 1998.

    Article  Google Scholar 

  2. Burrage, M. D., D. A. Gell, P. B. Hays, A. R. Marshall, D. A. Ortland, W. R. Skinner, R. Niciejewski, F. J. Schidlin, G. G. Shepherd, W. Singer, T. Tsuda, and R. A. Vincent, Validation of mesosphere and lower thermosphere winds from the high resolution Doppler image on UARS, J. Geophys. Res., 101, 10,365–10,392, 1996.

    Article  Google Scholar 

  3. Hedin, A. E., E. L. Fleming, A. H. Manson, F. J. Schmidlin, S. K. Avery, R. R. Clark, S. J. Franke, G. J. Fraser, T. Tsuda, F. Vial, and R. A. Vincent, Empirical wind model for the upper, middle and lower atmosphere, J. Atmos. Terr. Phys., 58, 1421–1447, 1996.

    Article  Google Scholar 

  4. Hocke, K. and K. Igarashi, Variability and anisotropy of mesospheric wind spectra, Geophys. Res. Lett., 24, 2725–2727, 1997.

    Article  Google Scholar 

  5. Hocke, K. and K. Igarashi, Mean winds in the mesopause region observed by MF radars at 31° and 45°N, J. Atmos. Sol.-Terr. Phys., 60, 1081–1087, 1998a.

    Article  Google Scholar 

  6. Hocke, K. and K. Igarashi, 24- and 12-hour oscillations during a time of strong eastward wind in the upper mesosphere at 31° and 45°N, J. Atmos. Sol.-Terr. Phys., 60, 1071–1079, 1998b.

    Article  Google Scholar 

  7. Hocke, K. and K. Igarashi, Diurnal and semidiurnal tide in the upper middle atmosphere during the first year of simultaneous MF radar observations in northern and southern Japan (45°N and 31°N), Ann. Geophysicae, 17, 405–414, 1999.

    Article  Google Scholar 

  8. Hocke, K., G. Ma, K. Igarashi, R. Schminder, D. Kurschner, A. H. Manson, C. E. Meek, and Y. Luo, Possible energy transfer from the solar wind into the Earth’s middle atmosphere by recurrent geomagnetic activity, submitted to Ann. Geophysicae, 1998c.

  9. Igarashi, K., I. Nishimuta, Y. Murayama, T. Tsuda, T. Nakamura, and M. Tsutsumi, Comparison of wind measurements between Yamagawa MF radar and the MU radar, Geophys. Res. Lett., 23, 3341–3344, 1996.

    Article  Google Scholar 

  10. Igarashi, K., T. Ogawa, T. Maruyama, I. Nishimuta, M. F. Larsen, M. Yamamoto, and S. Fukao, Simultaneous observations of mesospheric winds and sporadic E layer at Yamagawa during the SEEK campaign, ISAS Report, 38, 75–82, 1998.

    Google Scholar 

  11. Igarashi, K., Y. Murayama, M. Nagayama, and S. Kawana, D-regionelectron density measurements by MF radar in the middle and high latitude, Adv. Space Res., 1999 (in print).

  12. Larsen, M. F., S. Fukao, M. Yamamoto, R. Tsunoda, K. Igarashi, and T. Ono, The SEEK chemical release experiment: Observed neutral wind profile in a region of sporadic E, Geophys. Res. Lett., 25, 1789–1792, 1998.

    Article  Google Scholar 

  13. Murayama, Y., K. Igarashi, I. Nishimuta, R. Yamazaki, K.-I. Oyama, T. Tsuda, T. Nakamura, S. Fukao, H.-U. Widdel, and K. Schlegel, Cooperative wind observation in the upper mesosphere and lower thermosphere with foil chaff technique, the MU radar, and Yamagawa MF radar, Earth Planets Space, 51, this issue, 719–729, 1999.

    Article  Google Scholar 

  14. Singer, W., J. Bremer, P. Hoffmann, A. H. Manson, C. E. Meek, R. Schminder, D. Kürschner, Yu. I. Portnyagin, N. A. Makarov, H. G. Muller, E. S. Kazimirovsky, and R. R. Clark, Geomagnetic influences upon tideswinds from MLT radars, J. Atmos. Terr. Phys., 56, 1301–1311, 1994.

    Article  Google Scholar 

  15. Tsunoda, R. T., M. Yamamoto, K. Igarashi, K. Hocke, and S. Fukao, Quasiperiodic radar echoes from midlatitude sporadic E and role of the 5-day planetary wave, Geophys. Res. Lett., 25, 951–954, 1998.

    Article  Google Scholar 

  16. Yamazaki, R., K. Igarashi, M. Nagayama, and I. Nishimuta, The effect of signal saturation on wind velocity estimates using MF radar signals, Adv. Space Res., 1999 (in print).

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Igarashi, K., Murayama, Y., Hocke, K. et al. Coordinated observations of the dynamics and coupling processes of mesosphere and lower thermosphere winds with MF radars at the middle-high latitude. Earth Planet Sp 51, 657–664 (1999).

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  • Meridional Wind
  • Diurnal Tide
  • Lower Thermosphere
  • Dynamo Region
  • Communication Research Laboratory