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High-resolution observations of core...

Burchill, Johnathan Kerr.

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High-resolution observations of core and suprathermal ions in the auroral ionosphere: Techniques and results from the GEODESIC sounding rocket.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	High-resolution observations of core and suprathermal ions in the auroral ionosphere: Techniques and results from the GEODESIC sounding rocket./
Author:	Burchill, Johnathan Kerr.
Description:	212 p.
Notes:	Adviser: David J. Knudsen.
Contained By:	Dissertation Abstracts International65-01B.
Subject:	Physics, Astronomy and Astrophysics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=NQ86971
ISBN:	9780612869714

High-resolution observations of core and suprathermal ions in the auroral ionosphere: Techniques and results from the GEODESIC sounding rocket.
Burchill, Johnathan Kerr.

High-resolution observations of core and suprathermal ions in the auroral ionosphere: Techniques and results from the GEODESIC sounding rocket. - 212 p.

Adviser: David J. Knudsen.

Thesis (Ph.D.)--University of Calgary (Canada), 2003.

Low-energy (Ek &sim; 10-1--10 1 eV) ions comprise the bulk of Earth's ionosphere, and represent the initial stages of ion heating and outflow from Earth's auroral regions. The suprathermal ion imager (SII) is a fast (&sim;93 images/sec), compact, two-dimensional ion energy (0 < Ek < 20 eV) and direction-of-arrival analyzer designed to observe the energy distributions of these ions in detail, with emphasis on exploring small-scale (&sim;10--100 m) structure in the ionosphere. The SII was flown into an auroral substorm on the GEODESIC sounding rocket from Poker Flat, Alaska, on 26 February 2000.

ISBN: 9780612869714Subjects--Topical Terms:

1019521
Physics, Astronomy and Astrophysics.

High-resolution observations of core and suprathermal ions in the auroral ionosphere: Techniques and results from the GEODESIC sounding rocket.
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020 $a 9780612869714
035 $a (UMI)AAINQ86971
035 $a AAINQ86971
040 $a UMI $c UMI
100 1 $a Burchill, Johnathan Kerr. $3 1264011
245 1 0 $a High-resolution observations of core and suprathermal ions in the auroral ionosphere: Techniques and results from the GEODESIC sounding rocket.
300 $a 212 p.
500 $a Adviser: David J. Knudsen.
500 $a Source: Dissertation Abstracts International, Volume: 65-01, Section: B, page: 0253.
502 $a Thesis (Ph.D.)--University of Calgary (Canada), 2003.
520 $a Low-energy (Ek &sim; 10-1--10 1 eV) ions comprise the bulk of Earth's ionosphere, and represent the initial stages of ion heating and outflow from Earth's auroral regions. The suprathermal ion imager (SII) is a fast (&sim;93 images/sec), compact, two-dimensional ion energy (0 < Ek < 20 eV) and direction-of-arrival analyzer designed to observe the energy distributions of these ions in detail, with emphasis on exploring small-scale (&sim;10--100 m) structure in the ionosphere. The SII was flown into an auroral substorm on the GEODESIC sounding rocket from Poker Flat, Alaska, on 26 February 2000.
520 $a The technical element of this thesis deals with the development of a computer model of the SII, and techniques for extracting and interpreting physical quantities from the SII observations. Laboratory and in-flight calibrations demonstrate that the analyzer imaging capability departs from the ideal model. Nevertheless, the SII represents a technological step forward, and has yielded new scientific results.
520 $a The scientific element of this thesis focuses on simultaneous observations of ion energy distributions and low-frequency plasma waves in the topside (500--1000 km) auroral ionosphere. GEODESIC encountered three types of plasma wave which have previously been associated with ion heating. However, heated ions were only observed in association with localized density depletions and wave enhancements known as lower-hybrid solitary structures (LHSS). Approximately 90% of the LHSS ion number density is comprised of the ambient isotropic sub-eV core population. The remaining 10% corresponds to transverse acceleration of ions (TAI) to within 5° transverse to the geomagnetic field and to mean energies up to 5--10 eV, consistent with previous findings. Contrary to previously published observations, the GEODESIC TAI is consistent with localized bulk heating of some of the ambient core. Ion heating was not observed in association with large-scale (>1 km) broadband extremely low frequency (BB ELF) wave enhancements. Similarly, no ion heating was detected in the presence of large amplitude, short perpendicular wavelength Alfven waves. Differences between low-frequency ion flow fluctuations and convection drift fluctuations can be explained only partially by ion polarization drift physics.
590 $a School code: 0026.
650 4 $a Physics, Astronomy and Astrophysics. $3 1019521
650 4 $a Physics, Atmospheric Science. $3 1019431
690 $a 0606
690 $a 0608
710 2 $a University of Calgary (Canada). $3 1017619
773 0 $t Dissertation Abstracts International $g 65-01B.
790 $a 0026
790 1 0 $a Knudsen, David J., $e advisor
791 $a Ph.D.
792 $a 2003
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=NQ86971