Artificial heating of the lower ionosphere

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dc.contributor.advisorGordon, William E.en_US
dc.creatorShowen, Robert LeRoyen_US
dc.date.accessioned2016-04-22T21:59:45Zen_US
dc.date.available2016-04-22T21:59:45Zen_US
dc.date.issued1969en_US
dc.description.abstractThe lower ionosphere has been heated in a controlled experiment at the Arecibo ionospheric Observatory. Deposition of energy from a 40 Mhz transmitter has approximately doubled the ambient electron temperature at an altitude of 80 km. Energy from the radio wave is deposited in the ionosphere as a result of collisions of the electrons with the neutral molecules. Cross-modulation experiments (performed elsewhere) have gained information on electron number density and collision frequency between 60 and 90 km. The experiment described here will possibly allow determination of the electron collision frequency and thermal relaxation times between 70 and 120 km, and may increase the understanding of the interaction of plasmas and radio waves. The heating is measured with the 430 Mhz incoherent backscatter radar system. The temperature dependence of the electron backscatter cross-section enables the change in electron temperature to be inferred from backscatter power measurements. Heating with megawatt pulses of 1, 2 and 5 ms duration confirmed predictions of the magnitude of heating.en_US
dc.format.digitalOriginreformatted digitalen_US
dc.format.extent64 ppen_US
dc.identifier.callnoThesis SP.SCI. 1969 Showenen_US
dc.identifier.citationShowen, Robert LeRoy. "Artificial heating of the lower ionosphere." (1969) Master’s Thesis, Rice University. <a href="https://hdl.handle.net/1911/90106">https://hdl.handle.net/1911/90106</a>.en_US
dc.identifier.digitalRICE1142en_US
dc.identifier.urihttps://hdl.handle.net/1911/90106en_US
dc.language.isoengen_US
dc.rightsCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.titleArtificial heating of the lower ionosphereen_US
dc.typeThesisen_US
dc.type.materialTexten_US
thesis.degree.departmentSpace Scienceen_US
thesis.degree.disciplineNatural Sciencesen_US
thesis.degree.grantorRice Universityen_US
thesis.degree.levelMastersen_US
thesis.degree.nameMaster of Scienceen_US
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