Publication Date:
2016-09-04
Description:
Wind data observed by a Fabry Perot Interferometer (FPI) and a Meteor Radar (MR) deployed in two stations, which are 430 km apart in ground distance, are used to study wind climatology in MLT over Central China and compare between the measurements. A general morphologic similarity of the FPI winds and MR winds is identified with four-years data since November 2011. At 87 km, the wind vector plots show the FPI and MR winds agree with each other very well in all months. The zonal winds of both instruments have an apparent semi-annual variation with a maximal strength of -20 m/s at around 18 UT in equinoctial months, and the meridional winds from both instruments have an apparent annual variation with a maximal strength of -40 m/s at around 15 UT in summer months. The correlation coefficients between the measurements of the two instruments are about 0.95 for meridional wind and 0.90 for zonal wind. At 97 km, the wind vector plots show that FPI and MR winds agree with each other from May to October and are obviously different in the rest months. There are very weak semi-annual variation at around 18 UT for both zonal winds and pronounced annual variation at around 13 UT for both meridional winds. The correlation coefficients between the FPI and MR winds are 0.73 for zonal wind and 0.86 for meridional wind, which are overall smaller than that at 87 km. A Gaussian distribution of airglow profile is used to investigate the deviations associated with peak height and full-width-half-maximum (FWHM) of airglow layer. It is found that the variation of peak height could lead to about 20% variation of correlation coefficients between measurements at the height of 87 km and about 14.8% at the height of 97 km on average. The variation of FWHM could lead to a correlation coefficient variation of about 2.4% and 3.5% at the height of 87 km and 97 km, respectively. Some other reasons, such as the influence of geomagnetic field on meteor trail, the propagation of gravity waves, could also contribute to these differences between measurements.
Print ISSN:
0148-0227
Topics:
Geosciences
,
Physics
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