{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/69228"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/69228","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Theoretical and Lidar Studies of the Density Response of the Mesospheric Sodium Layer to Gravity Wave Perturbations","abstract":"Laser radar observations of the mesospheric sodium layer often reveal wavelike density fluctuations moving through the layer. It is often assumed that these features are a layer density response to gravity waves. The density response of atmospheric layers to gravity waves is developed in two forms; an exact solution and a perturbation series solution. The degree of nonlinearity in the layer density response is clearly described by the series solution whereas the exact solution gives insight into the nature of the response. It is shown that density perturbations in an atmospheric layer can be substantially greater than the atmospheric density perturbations associated with the propagation of a gravity wave. Because of the density gradients present in atmospheric layers, interesting effects are observed such as a phase reversal in the linear layer response which occurs near the layer peak. Once the layer response is understood, the sodium layer can be used as a tracer of atmospheric wave motions.","abstract_html":"Laser radar observations of the mesospheric sodium layer often reveal wavelike density fluctuations moving through the layer. It is often assumed that these features are a layer density response to gravity waves. The density response of atmospheric layers to gravity waves is developed in two forms; an exact solution and a perturbation series solution. The degree of nonlinearity in the layer density response is clearly described by the series solution whereas the exact solution gives insight into the nature of the response. It is shown that density perturbations in an atmospheric layer can be substantially greater than the atmospheric density perturbations associated with the propagation of a gravity wave. Because of the density gradients present in atmospheric layers, interesting effects are observed such as a phase reversal in the linear layer response which occurs near the layer peak. Once the layer response is understood, the sodium layer can be used as a tracer of atmospheric wave motions.","abstract_has_math":false,"creators":["Shelton, John Davis"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Electrical Engineering","degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2014,"date_issued":"2014-12-15T19:04:16Z","date_published":"2014-12-15T19:04:16Z","updated_at":"2026-07-22T22:26:00Z","subjects":["Engineering, Electronics and Electrical"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["(UMI)AAI8209629"],"render_values":[{"text":"(UMI)AAI8209629","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/69228","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["Shelton, John Davis"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2014-12-15T19:04:16Z","10000-01-01","1982"]},{"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":["Engineering, Electronics and Electrical"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/69228","(UMI)AAI8209629"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Laser radar observations of the mesospheric sodium layer often reveal wavelike density fluctuations moving through the layer. It is often assumed that these features are a layer density response to gravity waves. The density response of atmospheric layers to gravity waves is developed in two forms; an exact solution and a perturbation series solution. The degree of nonlinearity in the layer density response is clearly described by the series solution whereas the exact solution gives insight into the nature of the response. It is shown that density perturbations in an atmospheric layer can be substantially greater than the atmospheric density perturbations associated with the propagation of a gravity wave. Because of the density gradients present in atmospheric layers, interesting effects are observed such as a phase reversal in the linear layer response which occurs near the layer peak. Once the layer response is understood, the sodium layer can be used as a tracer of atmospheric wave motions.","In order to increase the resolution of lidar data, a two-dimensional digital signal processing technique has been developed. Both spatial and temporal filtering are utilized to enhance the resolution by decreasing shot noise by more than 10 dB. Many of the features associated with a layer density response to gravity waves are observed in high resolution density profiles of the mesospheric sodium layer. These include nonlinearities as well as the phase reversal in the linear layer response.","Made available in DSpace on 2014-12-15T19:04:16Z (GMT). No. of bitstreams: 1 8209629.pdf: 7437280 bytes, checksum: d2b1358ba967a43ae2f894f79f0a0e83 (MD5) Previous issue date: 1982","Embargo set by: Seth Robbins for item 69394 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","231 p.","Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1982."]},{"key":"dc:title","label":"Title","values":["Theoretical and Lidar Studies of the Density Response of the Mesospheric Sodium Layer to Gravity Wave Perturbations"]}]}],"canonical_facts":{"dc:creator":["Shelton, John Davis"],"dc:date":["2014-12-15T19:04:16Z","10000-01-01","1982"],"dc:description":["Laser radar observations of the mesospheric sodium layer often reveal wavelike density fluctuations moving through the layer. It is often assumed that these features are a layer density response to gravity waves. The density response of atmospheric layers to gravity waves is developed in two forms; an exact solution and a perturbation series solution. The degree of nonlinearity in the layer density response is clearly described by the series solution whereas the exact solution gives insight into the nature of the response. It is shown that density perturbations in an atmospheric layer can be substantially greater than the atmospheric density perturbations associated with the propagation of a gravity wave. Because of the density gradients present in atmospheric layers, interesting effects are observed such as a phase reversal in the linear layer response which occurs near the layer peak. Once the layer response is understood, the sodium layer can be used as a tracer of atmospheric wave motions.","In order to increase the resolution of lidar data, a two-dimensional digital signal processing technique has been developed. Both spatial and temporal filtering are utilized to enhance the resolution by decreasing shot noise by more than 10 dB. Many of the features associated with a layer density response to gravity waves are observed in high resolution density profiles of the mesospheric sodium layer. These include nonlinearities as well as the phase reversal in the linear layer response.","Made available in DSpace on 2014-12-15T19:04:16Z (GMT). No. of bitstreams: 1 8209629.pdf: 7437280 bytes, checksum: d2b1358ba967a43ae2f894f79f0a0e83 (MD5) Previous issue date: 1982","Embargo set by: Seth Robbins for item 69394 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","231 p.","Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1982."],"dc:identifier":["http://hdl.handle.net/2142/69228","(UMI)AAI8209629"],"dc:subject":["Engineering, Electronics and Electrical"],"dc:title":["Theoretical and Lidar Studies of the Density Response of the Mesospheric Sodium Layer to Gravity Wave Perturbations"],"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":"2026-07-22T22:26:00Z"}