An experimental study of electron thermal runaway in the lower ionosphere

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dc.contributor.advisorGordon, William E.en_US
dc.contributor.committeeMemberAnderson, Hugh R.en_US
dc.contributor.committeeMemberWolf, Richard A.en_US
dc.creatorCoco, David Stephenen_US
dc.date.accessioned2018-12-18T21:16:03Zen_US
dc.date.available2018-12-18T21:16:03Zen_US
dc.date.issued1979en_US
dc.description.abstractAn ionospheric heating experiment has been performed at the Arecibo Observatory using the 43 MHz incoherent backscatter radar both as a heater and as a diagnostic. Radar pulses up to 9 msec in length were transmitted with 2.5 MW (2.5 x 1^erg/sec) peak: pulse power yielding a peak power flux of approximately 2. x 1 erg/cm sec at 1 km altitude. A 2 microsecond diagnostic pulse offset in frequency from the heating pulse was used to measure the resultant ohmic heating of electrons in the lower ionosphere. Using a model of electron heating and cooling in the lower ionosphere, the ratio of heated electron temperature to unheated electron temperature is calculated as a function of altitude and heating power flux. This model predicts a beam-averaged electron temperature ratio of about 2.25 at 1 km for a transmitted power of 2. MW, pulse length of 9 msec and an antenna efficiency of 5%. When the predicted beamaveraged electron temperature ratios are compared with the observed, the observed are found to be less than the predicted for all values of transmitted power used. Possible sources of the discrepancy between experiment and theory are discussed.en_US
dc.format.digitalOriginreformatted digitalen_US
dc.format.extent84 ppen_US
dc.identifier.callnoThesis Sp. Sci. 1979 Cocoen_US
dc.identifier.citationCoco, David Stephen. "An experimental study of electron thermal runaway in the lower ionosphere." (1979) Master’s Thesis, Rice University. <a href="https://hdl.handle.net/1911/103999">https://hdl.handle.net/1911/103999</a>.en_US
dc.identifier.digitalRICE1625en_US
dc.identifier.urihttps://hdl.handle.net/1911/103999en_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.titleAn experimental study of electron thermal runaway in 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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