Observations of 50-MHz type-II coherent echoes from within the polar cap

Observations of 50-MHz type-II coherent echoes from within the polar cap

Show other versions (1)

50-MHz type-II coherent echoes at geometrical aspect angles of 11.5° have been observed in the northern polar cap during pre-noon hours. The echoes had an unusually large Doppler width of 1200-1400 m s<sup>-1</sup> and were well correlated with strong magnetic disturbances in the rang...

Full description

Bibliographic Details
Main Authors: A. V. Kustov, J. A. Koehler, G. J. Sofko, D. W. Danskin, M. J. McKibben
Format: Article
Language:English
Published: Copernicus Publications 1994-07-01
Series:Annales Geophysicae
Online Access:https://www.ann-geophys.net/12/765/1994/angeo-12-765-1994.pdf
id doaj-4424b8434b2348e68d3c8b0091ebc03a
record_format Article
spelling doaj-4424b8434b2348e68d3c8b0091ebc03a2020-11-24T23:14:53ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05761994-07-011276577410.1007/s00585-994-0765-1Observations of 50-MHz type-II coherent echoes from within the polar capA. V. KustovJ. A. KoehlerG. J. SofkoD. W. DanskinM. J. McKibben50-MHz type-II coherent echoes at geometrical aspect angles of 11.5° have been observed in the northern polar cap during pre-noon hours. The echoes had an unusually large Doppler width of 1200-1400 m s<sup>-1</sup> and were well correlated with strong magnetic disturbances in the range 500-1000 nT. The dependence of intensity, spectral width and skewness versus radial velocity were similar to those known from previous experiments at lower latitudes and at small aspect angles. It is concluded that echo onset was due to the combination of several factors, including a highly conducting ionosphere, the presence of a very intense electric field, and strong radar wave refraction.https://www.ann-geophys.net/12/765/1994/angeo-12-765-1994.pdf
collection DOAJ
language English
format Article
sources DOAJ
author A. V. Kustov
J. A. Koehler
G. J. Sofko
D. W. Danskin
M. J. McKibben
spellingShingle A. V. Kustov
J. A. Koehler
G. J. Sofko
D. W. Danskin
M. J. McKibben
Observations of 50-MHz type-II coherent echoes from within the polar cap
Annales Geophysicae
author_facet A. V. Kustov
J. A. Koehler
G. J. Sofko
D. W. Danskin
M. J. McKibben
author_sort A. V. Kustov
title Observations of 50-MHz type-II coherent echoes from within the polar cap
title_short Observations of 50-MHz type-II coherent echoes from within the polar cap
title_full Observations of 50-MHz type-II coherent echoes from within the polar cap
title_fullStr Observations of 50-MHz type-II coherent echoes from within the polar cap
title_full_unstemmed Observations of 50-MHz type-II coherent echoes from within the polar cap
title_sort observations of 50-mhz type-ii coherent echoes from within the polar cap
publisher Copernicus Publications
series Annales Geophysicae
issn 0992-7689
1432-0576
publishDate 1994-07-01
description 50-MHz type-II coherent echoes at geometrical aspect angles of 11.5° have been observed in the northern polar cap during pre-noon hours. The echoes had an unusually large Doppler width of 1200-1400 m s<sup>-1</sup> and were well correlated with strong magnetic disturbances in the range 500-1000 nT. The dependence of intensity, spectral width and skewness versus radial velocity were similar to those known from previous experiments at lower latitudes and at small aspect angles. It is concluded that echo onset was due to the combination of several factors, including a highly conducting ionosphere, the presence of a very intense electric field, and strong radar wave refraction.
url https://www.ann-geophys.net/12/765/1994/angeo-12-765-1994.pdf
work_keys_str_mv AT avkustov observationsof50mhztypeiicoherentechoesfromwithinthepolarcap
AT jakoehler observationsof50mhztypeiicoherentechoesfromwithinthepolarcap
AT gjsofko observationsof50mhztypeiicoherentechoesfromwithinthepolarcap
AT dwdanskin observationsof50mhztypeiicoherentechoesfromwithinthepolarcap
AT mjmckibben observationsof50mhztypeiicoherentechoesfromwithinthepolarcap
_version_ 1725593015758618624

Similar Items