{"id":{"repo_id":"rice","oai_identifier":"oai:repository.rice.edu:1911/104064"},"canonical_url":"https://search.dev.ndltd.org/etd/rice/oai:repository.rice.edu:1911/104064","repository":{"repo_id":"rice","name":"Rice University","base_url":"https://repository.rice.edu/server/oai/request"},"display":{"title":"Enhanced plasma wave spectral asymmetries","abstract":"A strong high-frequency radio wave incident on the ionosphere is capable of exciting enhanced electron plasma waves via a parametric wave-plasma coupling interaction. Incoherent backscatter radar is used to obtain detailed power spectra of these enhanced plasma waves. Power and frequency asymmetries are detected between spectra of enhanced plasma waves propagating parallel and antiparallel to the radar line-of-sight at the altitude of observation. The power spectra are corrected for the antenna gain frequency dependence. The power asymmetry is attributed to linear convective amplification of the plasma waves, so that waves observed propagating parallel and antiparallel to the radar line-of-sight have originated at different altitudes, above and below the observation height. The frequency asymmetry is interpreted as a Doppler shift of the power spectra resulting from a downward static drift of the thermal electrons. This drift is necessary to maintain charge neutrality within the wave-plasma interaction region, replacing upward-escaping energetic electrons which have been bootstrap accelerated by the enhanced plasma waves.","abstract_html":"A strong high-frequency radio wave incident on the ionosphere is capable of exciting enhanced electron plasma waves via a parametric wave-plasma coupling interaction. Incoherent backscatter radar is used to obtain detailed power spectra of these enhanced plasma waves. Power and frequency asymmetries are detected between spectra of enhanced plasma waves propagating parallel and antiparallel to the radar line-of-sight at the altitude of observation. The power spectra are corrected for the antenna gain frequency dependence. The power asymmetry is attributed to linear convective amplification of the plasma waves, so that waves observed propagating parallel and antiparallel to the radar line-of-sight have originated at different altitudes, above and below the observation height. The frequency asymmetry is interpreted as a Doppler shift of the power spectra resulting from a downward static drift of the thermal electrons. This drift is necessary to maintain charge neutrality within the wave-plasma interaction region, replacing upward-escaping energetic electrons which have been bootstrap accelerated by the enhanced plasma waves.","abstract_has_math":false,"creators":["Duncan, Lewis M."],"institution":"Rice University","degree_name":"Master of Science","degree_level":"Masters","degree_discipline":"Natural Sciences","degree_department":null,"school":null,"contributors":[],"advisors":["Gordon, William E."],"committee_chairs":[],"committee_members":[],"year":1976,"date_issued":"1976","date_published":"1976","updated_at":"2026-07-24T04:10:36Z","subjects":[],"languages":["eng"],"rights":["Copyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder."],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/1911/104064","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Gordon, William E."]},{"key":"dc:creator","label":"Author","values":["Duncan, Lewis M."]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2018-12-18T21:16:55Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2018-12-18T21:16:55Z"]},{"key":"dc:date.issued","label":"Date","values":["1976"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Natural Sciences"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Masters"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Master of Science"]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["Rice University"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder."]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://hdl.handle.net/1911/104064"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["No page 66"]},{"key":"dc:description.abstract","label":"Abstract","values":["A strong high-frequency radio wave incident on the ionosphere is capable of exciting enhanced electron plasma waves via a parametric wave-plasma coupling interaction. Incoherent backscatter radar is used to obtain detailed power spectra of these enhanced plasma waves. Power and frequency asymmetries are detected between spectra of enhanced plasma waves propagating parallel and antiparallel to the radar line-of-sight at the altitude of observation. The power spectra are corrected for the antenna gain frequency dependence. The power asymmetry is attributed to linear convective amplification of the plasma waves, so that waves observed propagating parallel and antiparallel to the radar line-of-sight have originated at different altitudes, above and below the observation height. The frequency asymmetry is interpreted as a Doppler shift of the power spectra resulting from a downward static drift of the thermal electrons. This drift is necessary to maintain charge neutrality within the wave-plasma interaction region, replacing upward-escaping energetic electrons which have been bootstrap accelerated by the enhanced plasma waves."]},{"key":"dc:title","label":"Title","values":["Enhanced plasma wave spectral asymmetries"]}]}],"canonical_facts":{"dc:contributor.advisor":["Gordon, William E."],"dc:creator":["Duncan, Lewis M."],"dc:date.accessioned":["2018-12-18T21:16:55Z"],"dc:date.available":["2018-12-18T21:16:55Z"],"dc:date.issued":["1976"],"dc:description":["No page 66"],"dc:description.abstract":["A strong high-frequency radio wave incident on the ionosphere is capable of exciting enhanced electron plasma waves via a parametric wave-plasma coupling interaction. Incoherent backscatter radar is used to obtain detailed power spectra of these enhanced plasma waves. Power and frequency asymmetries are detected between spectra of enhanced plasma waves propagating parallel and antiparallel to the radar line-of-sight at the altitude of observation. The power spectra are corrected for the antenna gain frequency dependence. The power asymmetry is attributed to linear convective amplification of the plasma waves, so that waves observed propagating parallel and antiparallel to the radar line-of-sight have originated at different altitudes, above and below the observation height. The frequency asymmetry is interpreted as a Doppler shift of the power spectra resulting from a downward static drift of the thermal electrons. This drift is necessary to maintain charge neutrality within the wave-plasma interaction region, replacing upward-escaping energetic electrons which have been bootstrap accelerated by the enhanced plasma waves."],"dc:identifier.uri":["https://hdl.handle.net/1911/104064"],"dc:language.iso":["eng"],"dc:rights":["Copyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder."],"dc:title":["Enhanced plasma wave spectral asymmetries"],"dc:type":["Thesis"],"thesis:degree_discipline":["Natural Sciences"],"thesis:degree_level":["Masters"],"thesis:degree_name":["Master of Science"],"thesis:institution_name":["Rice University"]},"updated_at":"2026-07-24T04:10:36Z"}