Sferic propagation in the cutoff region of the earth-ionosphere waveguide
Thesis (M. Eng. and S.B.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2004.
| Main Author: | |
|---|---|
| Other Authors: | |
| Format: | Thesis |
| Language: | eng |
| Published: |
Massachusetts Institute of Technology
2005
|
| Subjects: | |
| Online Access: | http://hdl.handle.net/1721.1/17984 |
| _version_ | 1826213449499148288 |
|---|---|
| author | Surana, Kunal K. (Kunal Krishna), 1979- |
| author2 | Earle Williams. |
| author_facet | Earle Williams. Surana, Kunal K. (Kunal Krishna), 1979- |
| author_sort | Surana, Kunal K. (Kunal Krishna), 1979- |
| collection | MIT |
| description | Thesis (M. Eng. and S.B.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2004. |
| first_indexed | 2024-09-23T15:49:23Z |
| format | Thesis |
| id | mit-1721.1/17984 |
| institution | Massachusetts Institute of Technology |
| language | eng |
| last_indexed | 2024-09-23T15:49:23Z |
| publishDate | 2005 |
| publisher | Massachusetts Institute of Technology |
| record_format | dspace |
| spelling | mit-1721.1/179842019-04-12T15:56:26Z Sferic propagation in the cutoff region of the earth-ionosphere waveguide Surana, Kunal K. (Kunal Krishna), 1979- Earle Williams. Massachusetts Institute of Technology. Dept. of Electrical Engineering and Computer Science. Massachusetts Institute of Technology. Dept. of Electrical Engineering and Computer Science. Electrical Engineering and Computer Science. Thesis (M. Eng. and S.B.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2004. Includes bibliographical references (leaves 93-96). The waveguide cutoff phenomenon provides information about the height of a waveguide. This cutoff for the earth-ionosphere waveguide is illuminated by lightning sferics and is used to monitor the change in ionosphere height through the day-night boundary. The observed ionospheric heights are found to be dependent on the three kinds of source-receiver paths: daytime, nighttime and mixed. Accurate locations for individual events are obtained from the National Lightning Detection Network (NLDN) to enable the analysis. Tweek sferics, which asymptote towards the transverse resonance frequency of the waveguide, predominate in the night path giving the most precise information about ionospheric heights. Weak dispersion and steep transitions in one-dimensional spectra provide information about daytime heights. Propagation over mixed paths reveals both daytime and nighttime signatures. Nighttime observations are also compared against theoretical predictions (Porrat et al, 2001). Agreement is best for large peak current events ( > 100) kA). Some indication of a residual daytime effect in a nighttime ionosphere is also observed. by Kunal K. Surana. M.Eng.and S.B. 2005-06-02T19:30:39Z 2005-06-02T19:30:39Z 2004 2004 Thesis http://hdl.handle.net/1721.1/17984 57189479 eng M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 106 leaves 4803755 bytes 4816280 bytes application/pdf application/pdf application/pdf Massachusetts Institute of Technology |
| spellingShingle | Electrical Engineering and Computer Science. Surana, Kunal K. (Kunal Krishna), 1979- Sferic propagation in the cutoff region of the earth-ionosphere waveguide |
| title | Sferic propagation in the cutoff region of the earth-ionosphere waveguide |
| title_full | Sferic propagation in the cutoff region of the earth-ionosphere waveguide |
| title_fullStr | Sferic propagation in the cutoff region of the earth-ionosphere waveguide |
| title_full_unstemmed | Sferic propagation in the cutoff region of the earth-ionosphere waveguide |
| title_short | Sferic propagation in the cutoff region of the earth-ionosphere waveguide |
| title_sort | sferic propagation in the cutoff region of the earth ionosphere waveguide |
| topic | Electrical Engineering and Computer Science. |
| url | http://hdl.handle.net/1721.1/17984 |
| work_keys_str_mv | AT suranakunalkkunalkrishna1979 sfericpropagationinthecutoffregionoftheearthionospherewaveguide |