2026-09-22T02:53:11Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/16193 2023-07-10 col_2142_5131 col_2142_8888 com_2142_5130 com_2142_8887 com_2142_234

Makela, Jonathan J. Hedlund, Peter R. 2010-05-19T18:40:15Z 2010-05-19T18:40:15Z 2010-05-19T18:40:15Z One significant cause of disruption in the propagation of low-power, trans- atmospheric radio waves is equatorial spread F (ESF). The Rayleigh-Taylor instability (RTI) causes the development of many types of ESF events. It has been theorized that thermospheric winds have a substantial e ect on the growth rate of the RTI, but very little data has been gathered to verify or disprove this idea. This thesis proposes a method for synchronously using two ground-based Fabry-Perot interferometers (FPI) to estimate thermospheric winds. When a single FPI is used, assumptions must be made to obtain meaningful wind data, but there are inherent limitations to the usefulness of the data caused by the use of these assumptions. It must be assumed that either the vertical wind speed is zero or the vertical and horizontal winds are uniform for the entire observation area in order to obtain meaningful wind speed estimates. In addition, data from a single FPI cannot be used to identify complex struc- tures in the wind eld. However, a bistatic FPI system (BFPIS) can be used to obtain full vector wind information in two or more locations. This observa- tion methodology also has potential for reducing the number of assumptions that must be made. For a BFPIS, it need only be assumed that the vertical wind is uniform for the observation area. We begin with a review of the physical principles and typical methods for using an FPI to estimate thermospheric winds and temperatures. We then propose a method for using a BFPIS to improve collected data, as compared to using a single FPI, and present simulations that validate this method. Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2010-04-26T21:30:12Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 9 thesisrefs.bib: 12739 bytes, checksum: d7981464f1da26886dec1d00cbafaec9 (MD5) intro.tex: 4930 bytes, checksum: b0be6f157b238855e000b5e71f6e0628 (MD5) ch5-new_method.tex: 46139 bytes, checksum: 3693a5bc22349b8531859226460fdcec (MD5) ch4-obs_analysis.tex: 17609 bytes, checksum: 67f9c595438a143d1d78d9859dabeb04 (MD5) ch3-FPI.tex: 20849 bytes, checksum: 16f8dccd7a67557f879bb0085f82771f (MD5) ch2-Atmosphere.tex: 21210 bytes, checksum: c448ba81cb42f667ed0a8b7ef7bfdee1 (MD5) abs.tex: 1646 bytes, checksum: 1f3019f971fbf34dd3f59decde43b351 (MD5) ecethesis.tex: 9778 bytes, checksum: d10b8cf84ef570c666dc6aef7fa9e788 (MD5) Hedlund_Peter.pdf: 1945455 bytes, checksum: eb31bd7dbadf1814a4e7d141e1f3d210 (MD5) Made available in DSpace on 2010-05-19T18:40:15Z (GMT). No. of bitstreams: 10 thesisrefs.bib: 12739 bytes, checksum: d7981464f1da26886dec1d00cbafaec9 (MD5) intro.tex: 4930 bytes, checksum: b0be6f157b238855e000b5e71f6e0628 (MD5) ch5-new_method.tex: 46139 bytes, checksum: 3693a5bc22349b8531859226460fdcec (MD5) ch4-obs_analysis.tex: 17609 bytes, checksum: 67f9c595438a143d1d78d9859dabeb04 (MD5) ch3-FPI.tex: 20849 bytes, checksum: 16f8dccd7a67557f879bb0085f82771f (MD5) ch2-Atmosphere.tex: 21210 bytes, checksum: c448ba81cb42f667ed0a8b7ef7bfdee1 (MD5) abs.tex: 1646 bytes, checksum: 1f3019f971fbf34dd3f59decde43b351 (MD5) ecethesis.tex: 9778 bytes, checksum: d10b8cf84ef570c666dc6aef7fa9e788 (MD5) Hedlund_Peter.pdf: 1945455 bytes, checksum: eb31bd7dbadf1814a4e7d141e1f3d210 (MD5) license.txt: 4063 bytes, checksum: 94b243c93c5fc0d5150d4a53cd004432 (MD5) http://hdl.handle.net/2142/16193 en Copyright 2010 Peter Hedlund Fabry-Perot Interferometer ionosphere thermosphere thermospheric winds atmospheric science Using a bistatic Fabry-Perot interferometer system to improve the estimation of thermospheric winds 2010-5 Electrical & Computer Eng 1933 Electrical & Computer Engr 1200 University of Illinois at Urbana-Champaign Thesis M.S. MS:Electr & Computer Eng-UIUC 10KS1200MS