A Survey of Polar Cap F-Region Electron Densities Measured by the Sondrestrom Radar
The Sondrestrom incoherent scatter radar has been used to study F-region electron densities in the polar cap. The data were obtained while the radar antenna was scanned in the plane of the magnetic meridian. In this mode, electron densities are measured as a function of altitude and latitude so that...
Main Author: | |
---|---|
Other Authors: | |
Format: | Text |
Language: | English |
Published: |
1990
|
Subjects: | |
Online Access: | http://www.dtic.mil/docs/citations/ADP006314 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADP006314 |
id |
ftdtic:ADP006314 |
---|---|
record_format |
openpolar |
spelling |
ftdtic:ADP006314 2023-05-15T16:29:58+02:00 A Survey of Polar Cap F-Region Electron Densities Measured by the Sondrestrom Radar Robinson, R. M. LOCKHEED MISSILES AND SPACE CO INC PALO ALTO CA PALO ALTO RESEARCH LAB 1990-05-03 text/html http://www.dtic.mil/docs/citations/ADP006314 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADP006314 en eng http://www.dtic.mil/docs/citations/ADP006314 APPROVED FOR PUBLIC RELEASE DTIC AND NTIS Atmospheric Physics *IONOSPHERE *RADAR REFLECTIONS INCOHERENT SCATTERING F REGION ELECTRON DENSITY POLAR REGIONS GREENLAND MAGNETIC FIELDS RADAR ANTENNAS Component Reports Sondrestrom Air Base Text 1990 ftdtic 2016-02-19T17:31:10Z The Sondrestrom incoherent scatter radar has been used to study F-region electron densities in the polar cap. The data were obtained while the radar antenna was scanned in the plane of the magnetic meridian. In this mode, electron densities are measured as a function of altitude and latitude so that ionospheric boundaries can be easily identified. One boundary that is present in much of the data is a vertical wall of electron density between 80 and 200 km altitude that separates the region of aurorally-produced electron density from the polar regions where auroral precipitation is absent. Based on this criterion we identified more than 500 radar scans during which the radar measured F-region electron densities in the polar cap. The data were sorted according to magnetic activity, solar flux, invariant latitude, and magnetic local time. Besides calculating average electron density profiles, we also examined the altitude and latitude variations of the F-region peak density. The peak density in the polar cap F region varies by a factor of four between solar zenith angles of 85 and 120 deg. The relative amplitude of large scale irregularities is approximately twice as large when the F-region is not sunlit. The only evidence for transport effects in the measured electron density is a factor of three decrease in peak density in the dawn local time sector for the same solar zenith angle. This article is from 'The Effect of the Ionosphere on Radiowave Signals and Systems Performance Based on Ionospheric Effects Symposium Held on 1-3 May 1990', AD-A233 797, p452-459. Text Greenland 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 *IONOSPHERE *RADAR REFLECTIONS INCOHERENT SCATTERING F REGION ELECTRON DENSITY POLAR REGIONS GREENLAND MAGNETIC FIELDS RADAR ANTENNAS Component Reports Sondrestrom Air Base |
spellingShingle |
Atmospheric Physics *IONOSPHERE *RADAR REFLECTIONS INCOHERENT SCATTERING F REGION ELECTRON DENSITY POLAR REGIONS GREENLAND MAGNETIC FIELDS RADAR ANTENNAS Component Reports Sondrestrom Air Base Robinson, R. M. A Survey of Polar Cap F-Region Electron Densities Measured by the Sondrestrom Radar |
topic_facet |
Atmospheric Physics *IONOSPHERE *RADAR REFLECTIONS INCOHERENT SCATTERING F REGION ELECTRON DENSITY POLAR REGIONS GREENLAND MAGNETIC FIELDS RADAR ANTENNAS Component Reports Sondrestrom Air Base |
description |
The Sondrestrom incoherent scatter radar has been used to study F-region electron densities in the polar cap. The data were obtained while the radar antenna was scanned in the plane of the magnetic meridian. In this mode, electron densities are measured as a function of altitude and latitude so that ionospheric boundaries can be easily identified. One boundary that is present in much of the data is a vertical wall of electron density between 80 and 200 km altitude that separates the region of aurorally-produced electron density from the polar regions where auroral precipitation is absent. Based on this criterion we identified more than 500 radar scans during which the radar measured F-region electron densities in the polar cap. The data were sorted according to magnetic activity, solar flux, invariant latitude, and magnetic local time. Besides calculating average electron density profiles, we also examined the altitude and latitude variations of the F-region peak density. The peak density in the polar cap F region varies by a factor of four between solar zenith angles of 85 and 120 deg. The relative amplitude of large scale irregularities is approximately twice as large when the F-region is not sunlit. The only evidence for transport effects in the measured electron density is a factor of three decrease in peak density in the dawn local time sector for the same solar zenith angle. This article is from 'The Effect of the Ionosphere on Radiowave Signals and Systems Performance Based on Ionospheric Effects Symposium Held on 1-3 May 1990', AD-A233 797, p452-459. |
author2 |
LOCKHEED MISSILES AND SPACE CO INC PALO ALTO CA PALO ALTO RESEARCH LAB |
format |
Text |
author |
Robinson, R. M. |
author_facet |
Robinson, R. M. |
author_sort |
Robinson, R. M. |
title |
A Survey of Polar Cap F-Region Electron Densities Measured by the Sondrestrom Radar |
title_short |
A Survey of Polar Cap F-Region Electron Densities Measured by the Sondrestrom Radar |
title_full |
A Survey of Polar Cap F-Region Electron Densities Measured by the Sondrestrom Radar |
title_fullStr |
A Survey of Polar Cap F-Region Electron Densities Measured by the Sondrestrom Radar |
title_full_unstemmed |
A Survey of Polar Cap F-Region Electron Densities Measured by the Sondrestrom Radar |
title_sort |
survey of polar cap f-region electron densities measured by the sondrestrom radar |
publishDate |
1990 |
url |
http://www.dtic.mil/docs/citations/ADP006314 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADP006314 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/ADP006314 |
op_rights |
APPROVED FOR PUBLIC RELEASE |
_version_ |
1766019676166422528 |