{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/81253"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/81253","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Middle Atmosphere Structure and Dynamics: Lidar Studies and Gravity Wave Spectral Modeling","abstract":"Finally, a new gravity wave spectral model is developed. We employ more realistic models of the source spectra and diffusive filtering theory (DFT) to model the one-dimensional and two-dimensional spectra of horizontal and vertical winds, atmospheric density, and temperature. Although more complicated, this new DFT model apparently overcomes the discrepancies between some recent observations and the existing DFT model predictions. Airglow and Na-layer parameter spectra are important because they can be used to characterize the small vertical wave number region of the wave spectrum, which is relatively unaffected by dissipation. The new DFT model is used to model the horizontal wave number spectra of OH- and Na-layer parameters. The model spectra are compared with extensive lidar, balloon, and airglow imager observations obtained at a variety of sites and altitudes during the past decade.","abstract_html":"Finally, a new gravity wave spectral model is developed. We employ more realistic models of the source spectra and diffusive filtering theory (DFT) to model the one-dimensional and two-dimensional spectra of horizontal and vertical winds, atmospheric density, and temperature. Although more complicated, this new DFT model apparently overcomes the discrepancies between some recent observations and the existing DFT model predictions. Airglow and Na-layer parameter spectra are important because they can be used to characterize the small vertical wave number region of the wave spectrum, which is relatively unaffected by dissipation. The new DFT model is used to model the horizontal wave number spectra of OH- and Na-layer parameters. The model spectra are compared with extensive lidar, balloon, and airglow imager observations obtained at a variety of sites and altitudes during the past decade.","abstract_has_math":false,"creators":["Qian, Jun"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Electrical Engineering","degree_department":null,"school":null,"contributors":["Gardner, Chester S."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2015,"date_issued":"2015-09-25T20:10:16Z","date_published":"2015-09-25T20:10:16Z","updated_at":"2026-07-22T22:26:15Z","subjects":["Physics, Atmospheric Science"],"languages":["eng"],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["(MiAaPQ)AAI9904566"],"render_values":[{"text":"(MiAaPQ)AAI9904566","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/81253","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Gardner, Chester S."]},{"key":"dc:creator","label":"Author","values":["Qian, Jun"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2015-09-25T20:10:16Z","10000-01-01","1998"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Electrical Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Physics, Atmospheric Science"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/81253","(MiAaPQ)AAI9904566"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Finally, a new gravity wave spectral model is developed. We employ more realistic models of the source spectra and diffusive filtering theory (DFT) to model the one-dimensional and two-dimensional spectra of horizontal and vertical winds, atmospheric density, and temperature. Although more complicated, this new DFT model apparently overcomes the discrepancies between some recent observations and the existing DFT model predictions. Airglow and Na-layer parameter spectra are important because they can be used to characterize the small vertical wave number region of the wave spectrum, which is relatively unaffected by dissipation. The new DFT model is used to model the horizontal wave number spectra of OH- and Na-layer parameters. The model spectra are compared with extensive lidar, balloon, and airglow imager observations obtained at a variety of sites and altitudes during the past decade.","Made available in DSpace on 2015-09-25T20:10:16Z (GMT). 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We employ more realistic models of the source spectra and diffusive filtering theory (DFT) to model the one-dimensional and two-dimensional spectra of horizontal and vertical winds, atmospheric density, and temperature. Although more complicated, this new DFT model apparently overcomes the discrepancies between some recent observations and the existing DFT model predictions. Airglow and Na-layer parameter spectra are important because they can be used to characterize the small vertical wave number region of the wave spectrum, which is relatively unaffected by dissipation. The new DFT model is used to model the horizontal wave number spectra of OH- and Na-layer parameters. The model spectra are compared with extensive lidar, balloon, and airglow imager observations obtained at a variety of sites and altitudes during the past decade.","Made available in DSpace on 2015-09-25T20:10:16Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 9904566.pdf: 5053081 bytes, checksum: c3950ad4f47ee71a980f9c23228833fe (MD5) Previous issue date: 1998","Embargo set by: Seth Robbins for item 82534 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","U of I Only","103 p.","Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1998."],"dc:identifier":["http://hdl.handle.net/2142/81253","(MiAaPQ)AAI9904566"],"dc:language":["eng"],"dc:subject":["Physics, Atmospheric Science"],"dc:title":["Middle Atmosphere Structure and Dynamics: Lidar Studies and Gravity Wave Spectral Modeling"],"dc:type":["text"],"thesis:degree_discipline":["Electrical Engineering"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:26:15Z"}