Initial backscatter occurrence statistics from the CUTLASS HF radars
International audience A statistical study of the occurrence of ground and ionospheric backscatter within the fields-of-view of the CUTLASS HF radars, at an operating frequency of 10 MHz, during the first 20 months of operation has been undertaken. The diurnal variation of the occurrence of backscat...
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ftinsu:oai:HAL:hal-00316270v1 2023-11-12T04:19:22+01:00 Initial backscatter occurrence statistics from the CUTLASS HF radars Milan, S. E. Yeoman, T. K. Lester, M. Thomas, E. C. Jones, T. B. Department of Physics and Astronomy Leicester University of Leicester 1997 https://hal.science/hal-00316270 https://hal.science/hal-00316270/document https://hal.science/hal-00316270/file/angeo-15-703-1997.pdf en eng HAL CCSD European Geosciences Union hal-00316270 https://hal.science/hal-00316270 https://hal.science/hal-00316270/document https://hal.science/hal-00316270/file/angeo-15-703-1997.pdf info:eu-repo/semantics/OpenAccess ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00316270 Annales Geophysicae, 1997, 15 (6), pp.703-718 [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 1997 ftinsu 2023-10-25T16:25:39Z International audience A statistical study of the occurrence of ground and ionospheric backscatter within the fields-of-view of the CUTLASS HF radars, at an operating frequency of 10 MHz, during the first 20 months of operation has been undertaken. The diurnal variation of the occurrence of backscatter and the range at which such backscatter is observed is found to be highly dependent on seasonal changes of the ionospheric electron density in both the E and F region, determined from ionosonde observations. In general, ionospheric backscatter is observed at far ranges during the local day in winter months and at near ranges during the local night in summer months. The Iceland radar observes more near-range E region backscatter than the Finland radar as a consequence of its more zonal look-direction. The dependence of the occurrence of backscatter on geomagnetic activity and radar operating frequency are also investigated. The occurrence of ground and ionospheric backscatter is discussed in terms of HF propagation modes and ionospheric electron densities as well as geophysical processes. A brief assessment of the possible impact of solar cycle variations on the observations is made and frequency management is discussed. Such a study, with its focus on the `instrumental' aspect of backscatter occurrence, is essential for a full interpretation of HF coherent radar observations. Article in Journal/Newspaper Iceland Institut national des sciences de l'Univers: HAL-INSU |
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Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Milan, S. E. Yeoman, T. K. Lester, M. Thomas, E. C. Jones, T. B. Initial backscatter occurrence statistics from the CUTLASS HF radars |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience A statistical study of the occurrence of ground and ionospheric backscatter within the fields-of-view of the CUTLASS HF radars, at an operating frequency of 10 MHz, during the first 20 months of operation has been undertaken. The diurnal variation of the occurrence of backscatter and the range at which such backscatter is observed is found to be highly dependent on seasonal changes of the ionospheric electron density in both the E and F region, determined from ionosonde observations. In general, ionospheric backscatter is observed at far ranges during the local day in winter months and at near ranges during the local night in summer months. The Iceland radar observes more near-range E region backscatter than the Finland radar as a consequence of its more zonal look-direction. The dependence of the occurrence of backscatter on geomagnetic activity and radar operating frequency are also investigated. The occurrence of ground and ionospheric backscatter is discussed in terms of HF propagation modes and ionospheric electron densities as well as geophysical processes. A brief assessment of the possible impact of solar cycle variations on the observations is made and frequency management is discussed. Such a study, with its focus on the `instrumental' aspect of backscatter occurrence, is essential for a full interpretation of HF coherent radar observations. |
author2 |
Department of Physics and Astronomy Leicester University of Leicester |
format |
Article in Journal/Newspaper |
author |
Milan, S. E. Yeoman, T. K. Lester, M. Thomas, E. C. Jones, T. B. |
author_facet |
Milan, S. E. Yeoman, T. K. Lester, M. Thomas, E. C. Jones, T. B. |
author_sort |
Milan, S. E. |
title |
Initial backscatter occurrence statistics from the CUTLASS HF radars |
title_short |
Initial backscatter occurrence statistics from the CUTLASS HF radars |
title_full |
Initial backscatter occurrence statistics from the CUTLASS HF radars |
title_fullStr |
Initial backscatter occurrence statistics from the CUTLASS HF radars |
title_full_unstemmed |
Initial backscatter occurrence statistics from the CUTLASS HF radars |
title_sort |
initial backscatter occurrence statistics from the cutlass hf radars |
publisher |
HAL CCSD |
publishDate |
1997 |
url |
https://hal.science/hal-00316270 https://hal.science/hal-00316270/document https://hal.science/hal-00316270/file/angeo-15-703-1997.pdf |
genre |
Iceland |
genre_facet |
Iceland |
op_source |
ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00316270 Annales Geophysicae, 1997, 15 (6), pp.703-718 |
op_relation |
hal-00316270 https://hal.science/hal-00316270 https://hal.science/hal-00316270/document https://hal.science/hal-00316270/file/angeo-15-703-1997.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782335826898714624 |