Incoherent scatter radar detection of enhanced plasma line in ionospheric E-region over Arecibo
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72454738-MIT.pdf
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Author(s)
Pradipta, Rezy
Advisor(s)
Min-Chang Lee and Richard Temkin.
Alternative Title
ISR detection of enhanced plasma line in ionospheric E-region over Arecibo
Date Issued
2006
Publisher
Massachusetts Institute of Technology
Abstract
A series of incoherent scatter radar (ISR) observation were conducted at the Arecibo Observatory from December 27, 2005 until January 3, 2006. From plasma line measurements that were taken during this radar campaign, we found that plasma line enhancement was quite frequently seen in the ionospheric E-region. We hypothesized that the E-region plasma line enhancement over Arecibo was caused by precipitated electrons from the radiation belts. The precipitated electrons will enhance the population of suprathermal electrons in the E-region. Subsequently, suprathermal electrons will cause excitation of Langmuir waves that could be detected by incoherent scatter radar as plasma lines. In this thesis, we are going to examine and discuss the observed features of E-region plasma line enhancement over Arecibo to test this hypothesis. In addition, a theoretical discussion on Langmuir waves is also presented in a chapter of this thesis. Finally, we also introduce the Spread F Index (SFI) as a convenient bookkeeping method to summarize spread F condition over a certain period of time.
Description
Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Physics, 2006.
Includes bibliographical references (p. 45).
Subjects
Physics.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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