Properties of the Neutral Density in the Polar Lower Thermosphere Determined by Incoherent Scatter Radar
The properties of the lower thermospheric neutral density are investigated using incoherent scatter radar technique. The data examined include 52 days of radar measurements from Chatanika, Alaska taken during the period 1976-1982, and one 6-day continuous period from Sonderstrom, Greenland taken dur...
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ftdtic:ADA227723 2023-05-15T16:28:29+02:00 Properties of the Neutral Density in the Polar Lower Thermosphere Determined by Incoherent Scatter Radar Reese, Kenneth W. AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH 1990 text/html http://www.dtic.mil/docs/citations/ADA227723 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA227723 en eng http://www.dtic.mil/docs/citations/ADA227723 Approved for public release; distribution is unlimited. DTIC AND NTIS Atmospheric Physics Active & Passive Radar Detection & Equipment *ATMOSPHERIC DENSITY *RADAR REFLECTIONS *THERMOSPHERE IONS POLAR REGIONS MEASUREMENT TEMPERATURE INTERACTIONS NEUTRAL ALASKA AUTOCORRELATION THESES BACKSCATTERING INCOHERENCE ELECTRONS FORMATS DIPOLES INCOHERENT SCATTERING OSCILLATION COLLISIONS MAGNETIC TAPE GREENLAND OUTPUT ATMOSPHERIC TIDES COMPUTER PROGRAMS COUPLING(INTERACTION) RADAR SCATTERING INCOHERENT SCATTER RADAR Text 1990 ftdtic 2016-02-23T00:11:17Z The properties of the lower thermospheric neutral density are investigated using incoherent scatter radar technique. The data examined include 52 days of radar measurements from Chatanika, Alaska taken during the period 1976-1982, and one 6-day continuous period from Sonderstrom, Greenland taken during the Lower Thermospherica Coupling Study (LTCS-1) in September, 1987. The data analyzed to determine average vertical profiles of the neutral density and to characterize the tidal oscillations of the neutral density in the lower thermosphere. Techniques and software have been developed to process incoherent frequency is the received on magnetic tapes in a standard output format. The ion-neutral collision frequency is the radar-derived parameter from which one can derive neutral density in the lower thermosphere. The complicated interaction of the radar with the plasma makes it possible for so many parameters of the plasma to be determined from the backscattered spectrum of radiation. In the E-region, the ion-neutral collision frequency is fit from the autocorrelation function (ACF) under the assumption that the ion and electron temperatures are equal. But in the polar lower thermosphere, there are processes that can cause thermal disequilibrium among the ions and electrons. The dominant interaction between ions and neutrals in the lower thermosphere is and induced dipole interaction. Total neutral number densities are derived from the ion- neutral collision frequencies using this theory. (Author) (jd) Text Greenland Alaska Defense Technical Information Center: DTIC Technical Reports database Greenland |
institution |
Open Polar |
collection |
Defense Technical Information Center: DTIC Technical Reports database |
op_collection_id |
ftdtic |
language |
English |
topic |
Atmospheric Physics Active & Passive Radar Detection & Equipment *ATMOSPHERIC DENSITY *RADAR REFLECTIONS *THERMOSPHERE IONS POLAR REGIONS MEASUREMENT TEMPERATURE INTERACTIONS NEUTRAL ALASKA AUTOCORRELATION THESES BACKSCATTERING INCOHERENCE ELECTRONS FORMATS DIPOLES INCOHERENT SCATTERING OSCILLATION COLLISIONS MAGNETIC TAPE GREENLAND OUTPUT ATMOSPHERIC TIDES COMPUTER PROGRAMS COUPLING(INTERACTION) RADAR SCATTERING INCOHERENT SCATTER RADAR |
spellingShingle |
Atmospheric Physics Active & Passive Radar Detection & Equipment *ATMOSPHERIC DENSITY *RADAR REFLECTIONS *THERMOSPHERE IONS POLAR REGIONS MEASUREMENT TEMPERATURE INTERACTIONS NEUTRAL ALASKA AUTOCORRELATION THESES BACKSCATTERING INCOHERENCE ELECTRONS FORMATS DIPOLES INCOHERENT SCATTERING OSCILLATION COLLISIONS MAGNETIC TAPE GREENLAND OUTPUT ATMOSPHERIC TIDES COMPUTER PROGRAMS COUPLING(INTERACTION) RADAR SCATTERING INCOHERENT SCATTER RADAR Reese, Kenneth W. Properties of the Neutral Density in the Polar Lower Thermosphere Determined by Incoherent Scatter Radar |
topic_facet |
Atmospheric Physics Active & Passive Radar Detection & Equipment *ATMOSPHERIC DENSITY *RADAR REFLECTIONS *THERMOSPHERE IONS POLAR REGIONS MEASUREMENT TEMPERATURE INTERACTIONS NEUTRAL ALASKA AUTOCORRELATION THESES BACKSCATTERING INCOHERENCE ELECTRONS FORMATS DIPOLES INCOHERENT SCATTERING OSCILLATION COLLISIONS MAGNETIC TAPE GREENLAND OUTPUT ATMOSPHERIC TIDES COMPUTER PROGRAMS COUPLING(INTERACTION) RADAR SCATTERING INCOHERENT SCATTER RADAR |
description |
The properties of the lower thermospheric neutral density are investigated using incoherent scatter radar technique. The data examined include 52 days of radar measurements from Chatanika, Alaska taken during the period 1976-1982, and one 6-day continuous period from Sonderstrom, Greenland taken during the Lower Thermospherica Coupling Study (LTCS-1) in September, 1987. The data analyzed to determine average vertical profiles of the neutral density and to characterize the tidal oscillations of the neutral density in the lower thermosphere. Techniques and software have been developed to process incoherent frequency is the received on magnetic tapes in a standard output format. The ion-neutral collision frequency is the radar-derived parameter from which one can derive neutral density in the lower thermosphere. The complicated interaction of the radar with the plasma makes it possible for so many parameters of the plasma to be determined from the backscattered spectrum of radiation. In the E-region, the ion-neutral collision frequency is fit from the autocorrelation function (ACF) under the assumption that the ion and electron temperatures are equal. But in the polar lower thermosphere, there are processes that can cause thermal disequilibrium among the ions and electrons. The dominant interaction between ions and neutrals in the lower thermosphere is and induced dipole interaction. Total neutral number densities are derived from the ion- neutral collision frequencies using this theory. (Author) (jd) |
author2 |
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH |
format |
Text |
author |
Reese, Kenneth W. |
author_facet |
Reese, Kenneth W. |
author_sort |
Reese, Kenneth W. |
title |
Properties of the Neutral Density in the Polar Lower Thermosphere Determined by Incoherent Scatter Radar |
title_short |
Properties of the Neutral Density in the Polar Lower Thermosphere Determined by Incoherent Scatter Radar |
title_full |
Properties of the Neutral Density in the Polar Lower Thermosphere Determined by Incoherent Scatter Radar |
title_fullStr |
Properties of the Neutral Density in the Polar Lower Thermosphere Determined by Incoherent Scatter Radar |
title_full_unstemmed |
Properties of the Neutral Density in the Polar Lower Thermosphere Determined by Incoherent Scatter Radar |
title_sort |
properties of the neutral density in the polar lower thermosphere determined by incoherent scatter radar |
publishDate |
1990 |
url |
http://www.dtic.mil/docs/citations/ADA227723 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA227723 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Alaska |
genre_facet |
Greenland Alaska |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/ADA227723 |
op_rights |
Approved for public release; distribution is unlimited. |
_version_ |
1766018138214760448 |