{"614746":{"#nid":"614746","#data":{"type":"event","title":"Ph.D. Proposal Oral Exam - Marc Higginson-Rollins","body":[{"value":"\u003Cp\u003E\u003Cstrong\u003ETitle:\u0026nbsp; \u003C\/strong\u003E\u003Cem\u003ESmall-Scale D-Region Scattering of LF\/MF Signals of Opportunity\u003C\/em\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003ECommittee:\u0026nbsp; \u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003EDr. Cohen, Advisor\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003EDr. Scott, Chair\u003C\/p\u003E\r\n\r\n\u003Cp\u003EDr. Durgin\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EAbstract: \u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003EThe objective of the proposed research is to: 1) determine the correlation length scale of the D-region, 2) determine the root-mean-squared (RMS) height variation of reflections, 3) perform a statistical analysis of the selected metrics, and 4) model the results or incorporate aspects of roughness into an existing model. The D-region of the ionosphere, which ranges from about 60-100 km, is too high for continuous in-situ measurements, such as with high-altitude balloons, and too low for satellite-based measurements. As such, its properties remain largely unknown compared to other layers of the atmosphere and near-Earth space environment. The bulk of research studying the D-region utilizes Very Low Frequency (VLF) waves, which propagate efficiently to global distances. These waves, however, make it difficult to study a very localized region of the ionosphere, thus little is known about D-region scattering on a scale less than ~10-100 km. As an alternative, Low Frequency (LF) and Medium Frequency (MF) waves could be used as a diagnostic tool of the D-region. These higher frequencies have a higher attenuation rate than VLF, but this allows only a few modes to propagate, thus greatly simplifying the propagation problem to solve. The purpose of this research is to leverage LF\/MF signals to study the small-scale scattering, i.e. the \u0026quot;roughness\u0026quot;, of the D-region.\u003C\/p\u003E\r\n","summary":null,"format":"limited_html"}],"field_subtitle":"","field_summary":"","field_summary_sentence":[{"value":"Small-Scale D-Region Scattering of LF\/MF Signals of Opportunity"}],"uid":"28475","created_gmt":"2018-11-28 22:50:01","changed_gmt":"2018-11-28 22:50:01","author":"Daniela Staiculescu","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2018-12-04T13:00:00-05:00","event_time_end":"2018-12-04T15:00:00-05:00","event_time_end_last":"2018-12-04T15:00:00-05:00","gmt_time_start":"2018-12-04 18:00:00","gmt_time_end":"2018-12-04 20:00:00","gmt_time_end_last":"2018-12-04 20:00:00","rrule":null,"timezone":"America\/New_York"},"extras":[],"groups":[{"id":"434371","name":"ECE Ph.D. Proposal Oral Exams"}],"categories":[],"keywords":[{"id":"102851","name":"Phd proposal"},{"id":"1808","name":"graduate students"}],"core_research_areas":[],"news_room_topics":[],"event_categories":[{"id":"1788","name":"Other\/Miscellaneous"}],"invited_audience":[{"id":"78771","name":"Public"}],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[],"email":[],"slides":[],"orientation":[],"userdata":""}}}