Multiple frequency radar observations of high-latitude E region irregularities in the HF modified ionosphere
This paper discusses the results of the September 1983 observations of artificial field-aligned irregularities (AFAIs) in the Tromso, Norway region, made by backscatter radars operating at 46.9, 143.8, 21.4, and 140.0 MHz. Four classes of resonant instability processes at work in the E and F regions...
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ftnasantrs:oai:casi.ntrs.nasa.gov:19880035668 2023-05-15T18:33:49+02:00 Multiple frequency radar observations of high-latitude E region irregularities in the HF modified ionosphere Noble, S. T. Gordon, W. E. Djuth, F. T. Jost, R. J. Hedberg, A. Unclassified, Unlimited, Publicly available Dec 1, 1987 http://ntrs.nasa.gov/search.jsp?R=19880035668 unknown http://ntrs.nasa.gov/search.jsp?R=19880035668 Accession ID: 88A22895 Copyright Other Sources 46 Journal of Geophysical Research; 92; 13613-13 1987 ftnasantrs 2012-02-15T17:32:32Z This paper discusses the results of the September 1983 observations of artificial field-aligned irregularities (AFAIs) in the Tromso, Norway region, made by backscatter radars operating at 46.9, 143.8, 21.4, and 140.0 MHz. Four classes of resonant instability processes at work in the E and F regions are examined in detail: (1) the coupling of parametric decay instability waves across geomagnetic field lines, (2) thermal parametric instability, (3) four-wave interaction thermal parametric instability, and (4) the resonance instability. The characteristics of the AFAI scatter are described, with special attention given to the growth and decay time constants, functional dependence on the heater power and polarization, and the scattering cross sections of the irregularities. Other/Unknown Material Tromso Tromso NASA Technical Reports Server (NTRS) Norway Tromso ENVELOPE(16.546,16.546,68.801,68.801) |
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Open Polar |
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NASA Technical Reports Server (NTRS) |
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language |
unknown |
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46 |
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46 Noble, S. T. Gordon, W. E. Djuth, F. T. Jost, R. J. Hedberg, A. Multiple frequency radar observations of high-latitude E region irregularities in the HF modified ionosphere |
topic_facet |
46 |
description |
This paper discusses the results of the September 1983 observations of artificial field-aligned irregularities (AFAIs) in the Tromso, Norway region, made by backscatter radars operating at 46.9, 143.8, 21.4, and 140.0 MHz. Four classes of resonant instability processes at work in the E and F regions are examined in detail: (1) the coupling of parametric decay instability waves across geomagnetic field lines, (2) thermal parametric instability, (3) four-wave interaction thermal parametric instability, and (4) the resonance instability. The characteristics of the AFAI scatter are described, with special attention given to the growth and decay time constants, functional dependence on the heater power and polarization, and the scattering cross sections of the irregularities. |
format |
Other/Unknown Material |
author |
Noble, S. T. Gordon, W. E. Djuth, F. T. Jost, R. J. Hedberg, A. |
author_facet |
Noble, S. T. Gordon, W. E. Djuth, F. T. Jost, R. J. Hedberg, A. |
author_sort |
Noble, S. T. |
title |
Multiple frequency radar observations of high-latitude E region irregularities in the HF modified ionosphere |
title_short |
Multiple frequency radar observations of high-latitude E region irregularities in the HF modified ionosphere |
title_full |
Multiple frequency radar observations of high-latitude E region irregularities in the HF modified ionosphere |
title_fullStr |
Multiple frequency radar observations of high-latitude E region irregularities in the HF modified ionosphere |
title_full_unstemmed |
Multiple frequency radar observations of high-latitude E region irregularities in the HF modified ionosphere |
title_sort |
multiple frequency radar observations of high-latitude e region irregularities in the hf modified ionosphere |
publishDate |
1987 |
url |
http://ntrs.nasa.gov/search.jsp?R=19880035668 |
op_coverage |
Unclassified, Unlimited, Publicly available |
long_lat |
ENVELOPE(16.546,16.546,68.801,68.801) |
geographic |
Norway Tromso |
geographic_facet |
Norway Tromso |
genre |
Tromso Tromso |
genre_facet |
Tromso Tromso |
op_source |
Other Sources |
op_relation |
http://ntrs.nasa.gov/search.jsp?R=19880035668 Accession ID: 88A22895 |
op_rights |
Copyright |
_version_ |
1766218467157999616 |