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Rocket observations of VLF bursts, e...

Delory, Gregory Townsend.

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Rocket observations of VLF bursts, electron precipitation, and ion heating in the auroral ionosphere.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Rocket observations of VLF bursts, electron precipitation, and ion heating in the auroral ionosphere./
作者:	Delory, Gregory Townsend.
面頁冊數:	129 p.
附註:	Chair: Forrest Mozer.
Contained By:	Dissertation Abstracts International57-08B.
標題:	Physics, Astronomy and Astrophysics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9703100
ISBN:	9780591095432

Rocket observations of VLF bursts, electron precipitation, and ion heating in the auroral ionosphere.
Delory, Gregory Townsend.

Rocket observations of VLF bursts, electron precipitation, and ion heating in the auroral ionosphere. - 129 p.

Chair: Forrest Mozer.

Thesis (Ph.D.)--University of California, Berkeley, 1996.

The generation and evolution of auroral Very Low Frequency (VLF) waves is examined using particle spectrometers and electric field sensors on three University of California at Berkeley auroral sounding rockets, in an effort to study the role of these emissions in energy transfer processes throughout the auroral ionosphere. Specifically, the possibility that VLF emissions act as an intermediary in the transfer of energy from precipitating auroral electrons to ionospheric ions is investigated. The central experimental quantity obtained from the data is the wavelength spectra of these emissions, in order to characterize possible resonant interactions between the VLF waves and local auroral particle distributions. Using the complimentary methods of a quadupole antenna receiver and cross-spectral analysis from in situ measurements of auroral VLF emissions, it is shown that there is a short wavelength, bursty component of the VLF wave spectrum associated with enhanced fluxes of low-energy, field-aligned electrons. Particle measurements show positive slopes and plateaus in the reduced distributions of these electrons which may have been resonant with simultaneously observed VLF bursts. In many examples the instabilities in the electron distributions resulted from velocity dispersion in the electron beam. Other short wavelength VLF emissions are also observed which are not associated with low-energy electrons and need alternative mechanisms for their generation.

ISBN: 9780591095432Subjects--Topical Terms:

1019521
Physics, Astronomy and Astrophysics.

Rocket observations of VLF bursts, electron precipitation, and ion heating in the auroral ionosphere.
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500 $a Source: Dissertation Abstracts International, Volume: 57-08, Section: B, page: 5102.
502 $a Thesis (Ph.D.)--University of California, Berkeley, 1996.
520 $a The generation and evolution of auroral Very Low Frequency (VLF) waves is examined using particle spectrometers and electric field sensors on three University of California at Berkeley auroral sounding rockets, in an effort to study the role of these emissions in energy transfer processes throughout the auroral ionosphere. Specifically, the possibility that VLF emissions act as an intermediary in the transfer of energy from precipitating auroral electrons to ionospheric ions is investigated. The central experimental quantity obtained from the data is the wavelength spectra of these emissions, in order to characterize possible resonant interactions between the VLF waves and local auroral particle distributions. Using the complimentary methods of a quadupole antenna receiver and cross-spectral analysis from in situ measurements of auroral VLF emissions, it is shown that there is a short wavelength, bursty component of the VLF wave spectrum associated with enhanced fluxes of low-energy, field-aligned electrons. Particle measurements show positive slopes and plateaus in the reduced distributions of these electrons which may have been resonant with simultaneously observed VLF bursts. In many examples the instabilities in the electron distributions resulted from velocity dispersion in the electron beam. Other short wavelength VLF emissions are also observed which are not associated with low-energy electrons and need alternative mechanisms for their generation.
520 $a It is also shown that there is an association between ion energization and the dispersive fluxes of low-energy, field-aligned electrons responsible for short wavelength VLF wave generation, but that a detailed temporal correlation between the VLF waves themselves and the heated ions is not clear. The wave-length measurements of VLF emissions that are coincident with heated ions indicate that these emissions could effectively heat Hydrogen ions with energies of several eV, while the heating of ionospheric Oxygen is difficult given the observed wave number spectrum. Thus the intense, short-wavelength VLF emissions could act as an energy transfer mechanism between the precipitating auroral electrons and the cold ionospheric Hydrogen population, but the significance of these emissions in Oxygen ion heating remains in question.
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