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Remote sensing of mesospheric and thermospheric density perturbations induced by subtropical heavy rainfalls for spacecraft environment studyThe simultaneous measurements of VHF radar and HF Doppler array systems are used to observe three-dimensional wind speeds and gravity waves with the purpose of determining the density perturbations at different heights of mesosphere and thermosphere induced by the convective motions associated with subtropical heavy rainfall during the time period of the raining season. Frequency, horizontal wavelength, vertical wavelength, and phase velocity of the gravity waves are determined from the Fourier power spectral analysis of horizontal and vertical wind velocities. The results are compared with those of density perturbations caused by typhoons, tropical storms, and winter-time drizzles associated with convective motions. It is shown that the maximum amplitude of the density perturbations caused by the gravity waves is +/- 10 pct which is greater than that of density perturbations caused by gravity waves associated with weak convective motions in winter time and is smaller than that caused by the gravity waves associated with tropical storms.
Document ID
19910034686
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Hung, R. J.
(Alabama Univ. Huntsville, AL, United States)
Lee, C. C.
(Alabama, University Huntsville, United States)
Johnson, D. L.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Chen, A. J.
(National Central University Chung-Li, Republic of China, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1991
Subject Category
Meteorology And Climatology
Report/Patent Number
AIAA PAPER 91-0455
Accession Number
91A19309
Funding Number(s)
CONTRACT_GRANT: NSC-76-0202-M008-23
CONTRACT_GRANT: NAG8-63
CONTRACT_GRANT: NSC-77-0202-M008-22
Distribution Limits
Public
Copyright
Other

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