Abstract/Details

Radio and optical techniques for locating equatorial plasma irregularities


2009 2009

Other formats: Order a copy

Abstract (summary)

Plasma density depletions occur in the post-sunset F region ionosphere almost nightly during certain seasons at equatorial latitudes. These depletions contain density irregularities of scales ranging from a few centimeters to thousands of kilometers. Spread-F, the disruption of ionospheric measurements with ionosondes and incoherent scatter radar, and scintillation (fading) of trans-ionospheric radio communication and navigation signals are well-known symptoms of depletions. This dissertation describes new techniques to combine optical and radio ionospheric remote sensing data in common formats to leverage observational strengths and mitigate weaknesses, leading to new or improved physical interpretations. Principally, a technique for locating scintillation-causing irregularities in the Earth's equatorial regions using radio occultation and airglow imaging is presented. A similar technique is employed to study the relationship between Bragg-scale radar backscatter and depletions observed with the airglow imager. A climatology of airglow and radar data from the central Pacific that uncovers regularly occurring post-midnight depletions is also presented. Combined airglow and radar data from these events suggest that polarization electric fields within mesoscale traveling ionospheric disturbances (MSTIDs) seed post-midnight equatorial plasma depletions during geomagnetic quiet periods at solar minimum.

Indexing (details)


Subject
Electrical engineering;
Astronomy;
Atmospheric sciences
Classification
0544: Electrical engineering
0606: Astronomy
0725: Atmospheric sciences
Identifier / keyword
Applied sciences; Pure sciences; Earth sciences; Aeronomy; Equatorial spread-F; Ionosphere; Ionosphere irregularities; MSTID; Scintillation
Title
Radio and optical techniques for locating equatorial plasma irregularities
Author
Miller, Ethan Schofield
Number of pages
131
Publication year
2009
Degree date
2009
School code
0090
Source
DAI-B 71/01, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
9781109584271
Advisor
Makela, Jonathan J.
University/institution
University of Illinois at Urbana-Champaign
University location
United States -- Illinois
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
3392220
ProQuest document ID
89237151
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/89237151
Access the complete full text

You can get the full text of this document if it is part of your institution's ProQuest subscription.

Try one of the following:

  • Connect to ProQuest through your library network and search for the document from there.
  • Request the document from your library.
  • Go to the ProQuest login page and enter a ProQuest or My Research username / password.