Meteor radar wind over Chung-Li (24.9�N, 121�E), Taiwan, for the period 10-25 November 2012 which includes Leonid meteor shower: Comparison with empirical model and satellite measurements

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Title:	Meteor radar wind over Chung-Li (24.9�N, 121�E), Taiwan, for the period 10-25 November 2012 which includes Leonid meteor shower: Comparison with empirical model and satellite measurements
Authors:	朱延祥;Su, C. L.;Chen, H. C.;Chu, Y. H.;Chung, M. Z.;Kuong, R. M.;Lin, T. H.;Tzeng, K. J.;Wang, C. Y.;Wu, K. H.;Yang, K. F.
Contributors:	太空科學與科技研究中心
Keywords:	Diurnal variations;Global positioning systems;GPS;Harmonic analysis;HWM07;Interferometry;Least squares method;Meteorology;Meteors;Radar;radar meteor wind;Satellites;tide;Wind shear;Wind speed
Date:	2014-01-01
Issue Date:	2026-04-23 11:03:35 (UTC+8)
Publisher:	Wiley-Blackwell;Washington: Blackwell Publishing Ltd
Abstract:	摘要： The neutral winds in the mesosphere and lower thermosphere (MLT) region are measured by a newly installed meteor trail detection system (or meteor radar) at Chung‐Li, Taiwan, for the period 10–25 November 2012, which includes the Leonid meteor shower period. In this study, we use the 3 m field‐aligned plasma irregularities in the sporadic E (Es) region in combination with the International Geomagnetic Reference Field model to calibrate the system phase biases such that the true positions of the meteor trails can be correctly determined with interferometry technique. The horizontal wind velocities estimated from the radial velocities of the meteor trails and their locations by using a least squares method show that the diurnal tide dominates the variation of the MLT neutral wind with time over Chung‐Li, which is in good agreement with the horizontal wind model (HWM07) prediction. However, harmonic analysis reveals that the amplitudes of the mean wind, diurnal, and semidiurnal tides of the radar‐measured winds in height range 82–100 km are systematically larger than those of the model‐predicted winds by up to a factor of 3. A comparison shows that the overall pattern of the height‐local time distribution of the composite radar‐measured meteor wind is, in general, consistent with that of the TIMED Doppler Interferometer‐observed wind, which is dominated by a diurnal oscillation with downward phase progression at a rate of about 1.3 km/h. The occurrences of the Es layers retrieved from fluctuations of the amplitude and excess phase of the GPS signal received by the FORMOSAT‐3/COSMIC satellites during the GPS radio occultation (RO) process are compared with the shear zones of the radar‐measured meteor wind and HWM07 wind. The result shows that almost all of the RO‐retrieved Es layers occur within the wind shear zones that favor the Es layer formation based on the wind shear theory, suggesting that the primary physical process responsible for the Es layer events retrieved from the scintillations of the GPS RO signal is very likely the plasma convergence effect of the neutral wind shear. Key Points Meteor wind over Chung‐Li is measuredDiscrepancy between radar meteor wind and HWM07 wind is foundComparisons between radar wind and TIDI and COSMIC measurements are made 其他題名： Radio Sci 出版者： Washington: Blackwell Publishing Ltd 出版日期： 2014-08 出處： Radio science, 2014-08, Vol.49 (8), p.597-615 資源來源： Wiley Online Library - AutoHoldings Journals 版權： 2014. American Geophysical Union. All Rights Reserved. 識別號： ISSN: 0048-6604 識別號： EISSN: 1944-799X 識別號： DOI: 10.1002/2013RS005273
Appears in Collections:	[CENTER FOR ASTRONAUTICAL PHYSICS AND ENGINEERING (CAPE)] journal & Dissertation

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