@article{oai:nagoya.repo.nii.ac.jp:00018498,
 author = {Ogawa, T. and Kainuma, S. and Katoh, C.},
 issue = {2},
 journal = {Proceedings of the Research Institute of Atmospherics, Nagoya University},
 month = {Nov},
 note = {Some results of HF Doppler (HFD) measurements using the Communications Research Laboratory HFD network during the large geomagnetic storm of February 6-9, 1986 are reported. In association with the storm sudden commencement at 1312 UT on February 6, HFD frequency deviations belonging to an SCF(+-) type, which is believed to be caused by westward and subsequent eastward electric fields, were observed. Wave parameters of large-scale traveling ionospheric disturbances (period = 80-100 minutes, phase velocity = 440 m/s and horizontal wavelength= 2100- 2600 km) detected on the night of February 7 are almost completely consistent with those observed by the MU radar at Shigaraki. Very clear, sinusoidal HFD oscillations with a period of 2.5 minutes triggered by the sudden impulse at 1748 UT on February 9 were simultaneously accompanied with the geomagnetic pulsation. These HFD oscillations can be explained by the compressions and rarefactions of the ionospheric plasma due to the pulsation magnetic field., This special issue contains contributed papers presented at the symposium "Solar Terrestrial Events in February-March 1986" (January 19, 1989, Nagoya)},
 pages = {91--106},
 title = {HF DOPPLER OSCILLATIONS DURING THE GEOMAGNETIC STORM OF FEBRURAY 6-9, 1986},
 volume = {36},
 year = {1989}
}