A new SuperDARN meteor wind measurement: Raw time series analysis method and its application to mesopause region dynamics

[1] SuperDARN meteor wind measurements in the mesopause region using the standard analysis of ACFs constructed from the multi-pulse sequence have several shortcomings. To overcome them, we have developed a new method to enable raw time series analysis without degrading normal SuperDARN ACF observations. The unevenly sampled raw time series is processed to detect only underdense meteor echoes to deduce line-of-sight neutral wind velocities and decay time constants. We installed this new code at the SENSU Syowa radar in Antarctica. Distributions of underdense meteor echoes show clear and expected dependency on distance from the radar, local time, and diffusion coefficient. By using diffusion coefficients as height information, we successfully obtained the structure of a downward phase propagating semi-diurnal tide, which has not previously been achieved by analysing normal SuperDARN ACF data.

[1]  E. C. Thomas,et al.  Interferometric evidence for the observation of ground backscatter originating behind the CUTLASS coherent HF radars , 1997 .

[2]  R. G. Stockwell,et al.  Recent results with an MF radar at McMurdo, Antarctica: Characteristics and variability of motions near 12‐hour period in the mesosphere , 1998 .

[3]  M. Jarvis,et al.  Mesospheric winds derived from SuperDARN HF radar meteor echoes at Halley, Antarctica , 1999 .

[4]  Edward A. Mason,et al.  The mobility and diffusion of ions in gases , 1973 .

[5]  R. Greenwald,et al.  An HF phased‐array radar for studying small‐scale structure in the high‐latitude ionosphere , 1985 .

[6]  G. Hernández,et al.  Mesospheric 12‐hour oscillation near South Pole, Antarctica , 1993 .

[7]  John W. MacDougall,et al.  Super Dual Auroral Radar Network observations of meteor echoes , 1997 .

[8]  T. Ogawa,et al.  Some initial results of 50 MHz meteor radar observation at Syowa Station , 1985 .

[9]  W. Elford,et al.  Response of high frequency radar to meteor backscatter , 1988 .

[10]  D. T. Farley.  Multiple‐Pulse Incoherent‐Scatter Correlation Function Measurements , 1972 .

[11]  N. Nishitani,et al.  Upper mesosphere summer echoes detected with the Antarctic Syowa HF radar , 2002 .

[12]  Takuji Nakamura,et al.  Meteor observations with an MF radar , 1999 .

[13]  J. Forbes,et al.  First results from the meteor radar at South Pole: A large 12‐hour oscillation with zonal wavenumber one , 1995 .

[14]  Donald William Robert McKinley,et al.  Meteor science and engineering. , 1961 .

[15]  P. B. Byrne,et al.  Super Dual Auroral Radar Network observations of fluctuations in the spectral distribution of near range meteor echoes in the upper mesosphere and lower thermosphere , 2001 .

[16]  G. Hussey,et al.  A comparison of northern hemisphere winds using SuperDARN meteor trail and MF radar wind measurements , 2000 .

[17]  Susumu Kato,et al.  Meteor wind observations with the MU radar , 1991 .

[18]  T. B. Jones,et al.  DARN/SuperDARN , 1995 .