Excitation of Langmuir wave turbulence in high-frequency (HF) pump waves over Gakona, Alaska
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Nuclear Science and Engineering, February 2007. Includes bibliographical references (p. 53). (cont.) Investigated in this thesis are the excitation and observation of Langmuir wave turbulence caused by the parametric decay instability (P...
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ftmit:oai:dspace.mit.edu:1721.1/41300 2023-06-11T04:17:21+02:00 Excitation of Langmuir wave turbulence in high-frequency (HF) pump waves over Gakona, Alaska Rokusek, Daniel L Min-Chang Lee. Massachusetts Institute of Technology. Dept. of Nuclear Science and Engineering. 2007 53 p. application/pdf http://hdl.handle.net/1721.1/41300 eng eng Massachusetts Institute of Technology http://hdl.handle.net/1721.1/41300 214283034 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 Nuclear Science and Engineering Thesis 2007 ftmit 2023-05-29T08:39:56Z Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Nuclear Science and Engineering, February 2007. Includes bibliographical references (p. 53). (cont.) Investigated in this thesis are the excitation and observation of Langmuir wave turbulence caused by the parametric decay instability (PDI) in high-frequency space plasma heating experiments conducted at the NSF/DoD High Frequency Active Auroral Research Program (HAARP) facility in Gakona, Alaska during the spring and summer of 2006. The PDI is the decay of an electromagnetic (EM) wave into an electron plasma wave (i.e., Langmuir wave) and an ion acoustic wave. When the excited Langmuir wave parametrically decays into another Langmuir and ion acoustic wave pair, a cascade of Langmuir waves can occur provided that the instability threshold is satisfied. According to recently advanced theory by Kuo and Lee [2005], there are two possible methods of cascade: non-resonant and resonant. While the non-resonant cascade proceeds at the location of excitation, the resonant process occurs at lower altitudes to minimize losses that the non-resonant process incurs by remaining at the excitation altitude. Such losses are caused by the frequency mismatch effect, as the decay ion acoustic wave frequency becomes much less than that of the normal ion acoustic waves. In their downward propagation the Langmuir waves in the resonant cascade suffer from propagation losses, however these losses are less than those associated with the non-resonant process. The resonant process is therefore expected to have a lower threshold. Theoretical claims and calculations are compared to observations made at Arecibo, Puerto Rico and Tromso, Norway. Claims are also are supported by incoherent backscatter radar observations made at the HAARP facility in Gakona. by Daniel L. Rokusek. S.M. Thesis Tromso Tromso Alaska DSpace@MIT (Massachusetts Institute of Technology) Norway Tromso ENVELOPE(16.546,16.546,68.801,68.801) Langmuir ENVELOPE(-67.150,-67.150,-66.967,-66.967) |
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DSpace@MIT (Massachusetts Institute of Technology) |
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language |
English |
topic |
Nuclear Science and Engineering |
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Nuclear Science and Engineering Rokusek, Daniel L Excitation of Langmuir wave turbulence in high-frequency (HF) pump waves over Gakona, Alaska |
topic_facet |
Nuclear Science and Engineering |
description |
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Nuclear Science and Engineering, February 2007. Includes bibliographical references (p. 53). (cont.) Investigated in this thesis are the excitation and observation of Langmuir wave turbulence caused by the parametric decay instability (PDI) in high-frequency space plasma heating experiments conducted at the NSF/DoD High Frequency Active Auroral Research Program (HAARP) facility in Gakona, Alaska during the spring and summer of 2006. The PDI is the decay of an electromagnetic (EM) wave into an electron plasma wave (i.e., Langmuir wave) and an ion acoustic wave. When the excited Langmuir wave parametrically decays into another Langmuir and ion acoustic wave pair, a cascade of Langmuir waves can occur provided that the instability threshold is satisfied. According to recently advanced theory by Kuo and Lee [2005], there are two possible methods of cascade: non-resonant and resonant. While the non-resonant cascade proceeds at the location of excitation, the resonant process occurs at lower altitudes to minimize losses that the non-resonant process incurs by remaining at the excitation altitude. Such losses are caused by the frequency mismatch effect, as the decay ion acoustic wave frequency becomes much less than that of the normal ion acoustic waves. In their downward propagation the Langmuir waves in the resonant cascade suffer from propagation losses, however these losses are less than those associated with the non-resonant process. The resonant process is therefore expected to have a lower threshold. Theoretical claims and calculations are compared to observations made at Arecibo, Puerto Rico and Tromso, Norway. Claims are also are supported by incoherent backscatter radar observations made at the HAARP facility in Gakona. by Daniel L. Rokusek. S.M. |
author2 |
Min-Chang Lee. Massachusetts Institute of Technology. Dept. of Nuclear Science and Engineering. |
format |
Thesis |
author |
Rokusek, Daniel L |
author_facet |
Rokusek, Daniel L |
author_sort |
Rokusek, Daniel L |
title |
Excitation of Langmuir wave turbulence in high-frequency (HF) pump waves over Gakona, Alaska |
title_short |
Excitation of Langmuir wave turbulence in high-frequency (HF) pump waves over Gakona, Alaska |
title_full |
Excitation of Langmuir wave turbulence in high-frequency (HF) pump waves over Gakona, Alaska |
title_fullStr |
Excitation of Langmuir wave turbulence in high-frequency (HF) pump waves over Gakona, Alaska |
title_full_unstemmed |
Excitation of Langmuir wave turbulence in high-frequency (HF) pump waves over Gakona, Alaska |
title_sort |
excitation of langmuir wave turbulence in high-frequency (hf) pump waves over gakona, alaska |
publisher |
Massachusetts Institute of Technology |
publishDate |
2007 |
url |
http://hdl.handle.net/1721.1/41300 |
long_lat |
ENVELOPE(16.546,16.546,68.801,68.801) ENVELOPE(-67.150,-67.150,-66.967,-66.967) |
geographic |
Norway Tromso Langmuir |
geographic_facet |
Norway Tromso Langmuir |
genre |
Tromso Tromso Alaska |
genre_facet |
Tromso Tromso Alaska |
op_relation |
http://hdl.handle.net/1721.1/41300 214283034 |
op_rights |
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 |
_version_ |
1768376454243942400 |