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2 edition of Observation of thermospheric winds by an optical doppler method in Antarctica. found in the catalog.

Observation of thermospheric winds by an optical doppler method in Antarctica.

Richard Donald Stewart

Observation of thermospheric winds by an optical doppler method in Antarctica.

by Richard Donald Stewart

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Published by The author] in [s.l .
Written in English


Edition Notes

Thesis (Ph. D.) - University of Ulster, 1986 (originally sponsored by Ulster Polytechnic).

ID Numbers
Open LibraryOL13872932M

  Thermospheric Winds and their Influence on the Ionosphere: (Review) (Mitteilungen aus dem Max-Planck-Institut für Aeronomie) 1st Edition by R. Rüster (Author) ISBN CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): During the nights of and February , Fabry-Perot interferometers were operated from the EISCAT radar site at Ramfjord (o N, o E) and Skibotn (o N, o E). From Ramfjord, horizontal neutral winds were measured in the lower and upper thermosphere using the auroral/airglow emissions at .

Mesospheric, lower thermospheric dynamics and external forcing effects: A review shortcomings, the method nevertheless has been widely used since it is relatively convenient, cheap, and often the only one available. When direct Doppler shifting by the mean winds. Thus, they form. Measurements of thermospheric neutral winds have now been made for over a decade by using FabryyPerot interferometers to monitor the Doppler shifts of the atomic oxygen O(‘D) airglow emission at 8, [Hernandez and Roble, ; Hernandez, ; Meriwether, Until the recent launch of the.

thermospheric wind near local midnight are related to MTM. The convergence of thermospheric winds at the equator near local midnight cause a density maximum and MTM [Herrero et al., ; Meriwether et al., ]. However, no observation of the thermospheric wind and temperature during an event of growing post-midnight FAIs has been reported. thermospheric winds have further accumulated to a degree that permits seasonal and solar cycle effects to be examined in unprecedented detail at a number of stations from the South Pole to the northern polar cap. In this paper, we analyze the local time, day-of-year, and solar cycle clima-tology of quiet time nighttime winds over seven stations. In.


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Observation of thermospheric winds by an optical doppler method in Antarctica by Richard Donald Stewart Download PDF EPUB FB2

In order to study the changes of thermospheric vertical winds associated with auroral activity, observations with a Fabry-Perot Doppler Imaging System (FPDIS) were carried out at Syowa station, Antarctica ( deg.

MLAT) on 37 nights from April to October in Cited by: 7. Fabry-Perot interferometer measurements of the Doppler shift of the Å O 1 S emission are used to derive neutral wind velocities at E-region altitudes over Halley, Antarctica (Λ=61°).

These measurements, recorded during the Lower Thermosphere Coupling Study (LTCS) period in Septembershow relatively large amplitude oscillatory wind fields of ∼50– ms −1 during Cited by: 3. A brief outline of the thermospheric structUre and dynamics and the possible interaction of the same with the F-region of the ionosphere is given.

It points out to the need that these two regions should be treated as a closely coupled system. Some of the most recent developments in optical measurements of neutral temperature and winds. A new optical instrument, the Fabry–Perot Doppler imaging system (FPDIS), has been developed for observations of two-dimensional distributions of thermospheric wind velocities and temperatures by the measurement of the Doppler shift and width of the aurora or of the airglow emission lines of atomic oxygen OI nm and OI nm over a wide field of view (°).

A new optical instrument, the Fabry-Perot Doppler imaging system (FPDIS), has been developed for observations of two-dimensional distributions of thermospheric wind velocities and temperatures by the measurement of the Doppler shift and width of the aurora or of the airglow emission lines of atomic oxygen OI nm and OI nm over a wide Cited by: Thermospheric Observations Fabry-Perot interferometers (FPI) observe the spectral shape of airglow emissions, from which estimates of Doppler shifts and Doppler broadenings can be derived.

When an FPI is designed to observe the thermospheric redline emission at nm (see below), the thermospheric neutral wind and temperature. [1] HIWIND (High altitude Interferometer WIND Observation) is the first balloon Fabry‐Perot interferometer (FPI) to achieve successful thermospheric wind measurement for both day and night.

By flying at ∼40 km altitude, HIWIND avoids the high solar scattering background and enables daytime remote sensing of Doppler shift in airglow for thermospheric wind observation.

Initial daytime and nighttime SOFDI observations of thermospheric winds from Fabry-Perot Doppler shift measurements of the nm OI line-shape Ann. Geophys., 29, –, www. Four years of GOCE observation near ∼ km altitude during – provide a large data set for examining winds near dawn and dusk.

The analysis has revealed interesting new features on the spatial and seasonal variation of the quiet time F region wind. (1) The wind structure in equatorial regions is aligned with the dip equator in all seasons but June solstice, forming a strong.

reliability of ground-based thermospheric wind measurements. These measurements are made by observing the Doppler shift of optical airglow emissions. In this work, we develop a radiative transfer code to quantify the effect of scattering in the troposphere.

We find that the storm-time apparent downward winds at. We present the first thermospheric wind measurements using a Doppler Asymmetric Spatial Heterodyne (DASH) spectrometer and the oxygen red-line nightglow emission.

The ground-based observations were made from Washington, DC and include simultaneous calibration measurements to track and correct instrument drifts.

Even though the measurements were made under challenging. these observations, such as Doppler radar radial winds (DRWs), is now common, although to avoid violating the assumption of uncorrelated observation errors the observation density is severely reduced.

Thermospheric winds on a total of nights have been studied for the effects due to geomagnetic activity, solar flux, and season. The observations have been made from to by a Fabry-Perot interferometer (FPI) operating at Halley (°S, °W), Antarctica. This is the first statistical study of thermospheric winds near the southern auroral zone.

Doppler radar systems have been instrumental to improve our understanding and monitoring capabilities of phenomena taking place in the low, middle, and upper atmosphere. Weather radars, wind profilers, and incoherent and coherent scatter radars implementing Doppler techniques are now used routinely both in research and operational applications by scientists and practitioners.

This book. Measurements and studies of high-latitude winds using FPI. A Fabry–Perot interferometer (FPI), which measures the Doppler shift of emission lines from aurora and airglow, is a unique optical instrument.

FPIs can measure the thermospheric wind from the ground-based stations and satellites (e.g., Killeen et al. ; Conde et al. The. Thermospheric mass density derived from CHAMP satellite precise orbit determination data based on energy balance method 13 July | Science China Earth Sciences, Vol.

60, No. 8 Characteristics of Stratospheric Winds over Jiuquan (°N, °E) Using. build a brassboard DASH instrument that is capable of measuring thermospheric winds from the ground [6]. Such ground-based Doppler shift measurements, using the atomic oxygen red line emission OI(3.

P D) at λ = nm, are routinely performed at many ground stations across the globe, typically using Fabry-Perot interferometers [7,8]. Doppler Optical Coherence Tomography is an extension of OCT, where it combines the Doppler effect principle to achieve high resolution tomographic images in biological tissues.

And because of its high resolution and velocity sensitivity, there are many applications in the medical field. The basic phenomenon of Doppler OCT can be explained below. P.A. Greet's 32 research works with citations and reads, including: Argon auroral emissions.

Knowledge of the thermospheric neutral wind and its horizontal components is critical for an improved understanding of F region dynamics and morphology. However, to date their reliable estimation remains a challenge because of difficulties in both measurement and modeling.

We present a new method to estimate the climatology of the zonal and meridional components of thermospheric. 1. Introduction. Optical coherence tomography (OCT) is a non-invasive, high resolution imaging modality capable of capturing three-dimensional images from highly scattering biological tissue [].In the past few years, due to the development of fast swept laser sources and high speed detector arrays, Fourier domain OCT systems have experienced dramatic improvement compared with the .vations, such as Doppler radar radial winds (DRWs), is now common, though to avoid violating the assumption of uncorrelated observation errors the ob-servation density is severely reduced.

To improve the quantity of observations used and the impact that they .Rüster R. () Calculation of thermospheric winds. In: Thermospheric Winds and Their Influence on the Ionosphere.

Mitteilungen aus dem Max-Planck-Institut für Aeronomie, vol